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    Wyświetlanie 1-13 z 13
    Tytuł:
    Wpływ promieniowania UV na właściwości powierzchniowe polilaktydu napełnianego grafitem
    The effects of UV irradiation on the surface properties of polylactide filled with graphite
    Autorzy:
    Olewnik-Kruszkowska, E.
    Kasperska, P.
    Kowalski, K.
    Richert, J.
    Kowalonek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/279134.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Inżynierii Materiałów Polimerowych i Barwników
    Tematy:
    kompozyt polilaktydowy
    polilaktyd
    PLA
    grafit
    napełniacz
    promieniowanie UV
    właściwości powierzchniowe
    polylactide composite
    polylactide
    poly(lactic acid)
    graphite
    filler
    UV radiation
    surface properties
    Opis:
    Folie o różnym składzie, zawierające polilaktyd jako osnowę polimerową i grafit jako napełniacz (5-50%wag.) zostały wystawione na różny czas działanie promieniowania UV (max. 254 nm). Badane materiały poddano analizie powierzchni za pomocą skaningowego mikroskopu elektronowego. Następnie w celu określenia wpływu promieniowania na właściwości warstwy wierzchniej analizowanych materiałów przeprowadzono badanie kąta zwilżania przed i bezpośrednio po naświetlaniu. Na podstawie uzyskanych wyników obliczono swobodną energię powierzchniową (SEP) metodą Owensa-Wendta. Otrzymane wartości SEP wskazują iż wprowadzenie napełniacza zmienia właściwości powierzchniowe polimeru, a stopień napełnienia ma istotny wpływ na zmianę kąta zwilżania zarówno przed jak i po różnym czasie naświetlania promieniowaniem UV.
    Films consisting of polylactide as a polymer matrix and graphite as a nanofiller (5-50%wt) were irradiated with UV (254 nm) for a varied amount of time (50, 100 and 150 hours). The surfaces of the investigated materials were analysed by means of Scanning Electron Microscopy (SEM). Afterwards, in order to determine the effects the UV radiation has on the surface layer properties of the researched composites, contact angle measurements were determined before and just after exposition. Based on the obtained results, the surface free energy (SFE) was calculated using the Owens-Wendt method. The determined SFE values indicate that the introduction of a nanofiller into polymer matries alters the surface properties of the polymer. It has also been established that the content ratio has a significant influence on the contact angle measurement both before and after varied periods of UV exposure.
    Źródło:
    Przetwórstwo Tworzyw; 2014, [R.] 20, nr 1 (157), 1 (157); 62-67
    1429-0472
    Pojawia się w:
    Przetwórstwo Tworzyw
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The membrane with polylactide and hyaluronic fibers for skin substitute
    Autorzy:
    Stodolak-Zych, E.
    Rozmus, K.
    Dzierzkowska, E.
    Zych, Ł.
    Kapacz-Kmita, A.
    Gargas, M.
    Kołaczkowska, E.
    Cieniawska, M.
    Książek, A.
    Ścisłowska-Czarnecka, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/306599.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    nanowłókna
    elektroprzędzenie
    kwas hialuronowy
    polilaktyd
    nanofibrous scaffold
    electrospinning
    skin substitute
    hyaluronic acid
    polylactide
    Opis:
    Skin substitutes are heterogeneous group of scaffolds (natural or synthetic) and cells. We hypothesize that nanofibers with layer composition made of polylactide (PLA) and sodium hyaluronate (HA) obtained using electrospinning method are a good matrix for cell adhesion and proliferation. Methods: Optimal conditions of electrospinning of PLA and HA nanofibers to create layered compositions (PLA membrane covered with HA nonwovens) were determined by modifying parameters such as the appropriate amount of solvents, polymer concentration, mixing temperature and electrospinning process conditions. By changing the parameters, it was possible to control the diameter and properties of both polymer fibers. The spinning solution were characterized by surface tension and rheology. A scanning electron microscope (SEM) was used to determine the morphology and fiber diameters: PLA and HA. Structure of the PLA/HA nonwoven was analyzed using spectroscopy (FTIR/ATR). Biocompatibility of the nonwoven with fibroblasts (ECM producers) was assessed in the in vitro conditions. Results: The results showed that stable conditions for the formation of submicron PLA fibers were obtained using a 13% wt. solution of the polymer, dissolved in a 3:1 mixture of DCM:DMF at 45 °C. The hyaluronic fibers were prepared from a 12% wt. solution of the polymer dissolved in a 2:1 mixture of ammonia water and ethyl alcohol. All materials were biocompatible but to a different degree. Conclusions: The proposed laminate scaffold was characterized by a hydrophobic-hydrophilic domain surface with a maintained fiber size of both layers. The material positively underwent biocompatibility testing in contact with fibroblasts.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2018, 20, 4; 91-99
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Struktura i reaktywność związków alkoksy-cynkowych jako inicjatorów/katalizatorów polimeryzacji estrów cynicznych
    Structure and reactivity of alkoxy-zinc compounds as initiators/catalysts in the polymerization of cyclic esters
    Autorzy:
    Petrus, Rafał
    Utko, Józef
    Sobota, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/1413188.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    związki alkoksylowe cynku
    polilaktyd
    polimeryzacja
    laktyd
    kwas mlekowy
    zinc alkoxides
    polylactide
    polymerization
    lactide
    lactic acid
    Opis:
    This review focuses on advances in the synthesis and structural chemistry of zinc alkoxide compounds for use in the catalytic ring-opening polymerization (ROP) of lactides (LAs). This route was used for the preparation of lactic acid based polymers - referred to as polylactides (PLAs). These polyesters have ecofriendly properties such as renewability, biocompatibility, and biodegradability, and are therefore among the most promising green polymers. PLAs have found numerous specialty applications in the biomedical industry, such as biodegradable screws and sutures, scaffolds for tissue engineering, matrices for controlled drug delivery systems, and environmentally friendly food-packaging materials. In industry, PLAs were synthesized by bulk polymerization of LA using tin(II) alkoxides synthesized in situ from tin(II) 2-ethylhexanoate. The toxicity associated with most tin compounds is a considerable drawback in the case of biomedical applications. There has therefore been much research devoted to finding well- defined complexes of high activity containing biologically benign metals. In this context, zinc alkoxides are very attractive non-toxic initiators for the synthesis of polymers that could be used in medical and environmental fields. The most broadly applied representations of zinc initiators for ROP of LA are zinc carboxylates, ß-diketonates, ß-diketiminates, phenolates and bisphenolates, trispyrazolyl- and trisindazolyl-borates, heteroscorpionates, aminophenolates, Schiff base, and iminealkoxylates. The mentioned above initiators were classified and analyzed in the context of their coordination chemistry and revealed catalytic activity in the ROP of LA. The review contains only pioneering/groundbreaking works that allowed for setting new research paths for each of the described groups of initiators, showing how this theme has changed over the last several decades.
    Źródło:
    Wiadomości Chemiczne; 2021, 75, 3-4; 343-373
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Strength, Water Absorption, Thermal and Antimicrobial Properties of a Biopolymer Composite Wound Dressing
    Autorzy:
    Odili, Cletus Chiosa
    Sekunowo, Olatunde Israel
    Ilomuanya, Margaret Okonawan
    Gbenebor, Oluwashina Philips
    Adeosun, Samson Oluropo
    Powiązania:
    https://bibliotekanauki.pl/articles/2056037.pdf
    Data publikacji:
    2022
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    chitin
    chitosan
    hydrophilicity
    polylactide acid
    skin
    wound
    staphylococcus-Auerus
    Opis:
    Conventional wound material allows bacterial invasions, trauma and discomfort associated with the changing of the dressing material, and the accumulation of body fluid for wounds with high exudate. However, there is a shift from conventional wound dressing materials to polymeric nanofibers due to their high surface area to volume ratio, high porosity, good pore size distribution, which allows for cell adhesion and proliferation. There is an urgent need to synthesis a biodegradable composite that is resistant to bacterial infection. In this study, an electrospun polylactide (PLA) composite suitable for wound dressing, with enhanced antimicrobial and mechanical properties, was produced. The neat PLA, PLA/CH (10 wt.%), PLA/CH (5 wt.%), PLA/CHS (10 wt.%), PLA/CHS (5 wt.%), PLA/CH (2.5 wt.%) /CHS (2.5 wt.%) and PLA/CH (5 wt.%)/CHS (5 wt.%), were electrospun using 0.14 g/ml solution. Results show that crystallinity (67.6%) of neat PLA declined by 3.8% on the addition of 2.5 wt.% chitin/chitosan with improved hydrophilicity of the composite. The tensile strength of neat PLA (0.3 MPa) increased (0.6 MPa) with 2.5 wt.% chitin/chitosan addition. The slight increase in the glass transition temperature from 75°C for neat PLA to 78°C of the composite fibre, showed improved ductility. The fibres showed little beads, hence suitable for wound dressing. The electrospun mats have good water absorption capacity and strong resistance against Staphylococcus aureus. Good performance was attained at 5 wt.% of chitin, chitosan and hybrid reinforcements. Therefore, a PLA/chitin/chitosan composite is recommended as a wound dressing material.
    Źródło:
    Journal of Casting & Materials Engineering; 2022, 6, 1; 22--32
    2543-9901
    Pojawia się w:
    Journal of Casting & Materials Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Separacja elektrostatyczna mieszanin polimerowych o różnych zawartościach PVC i PLA
    Electrostatic separation of polymeric blends of different PVC and PLA contents
    Autorzy:
    Żenkiewicz, M.
    Żuk, T.
    Błaszkowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/278954.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Inżynierii Materiałów Polimerowych i Barwników
    Tematy:
    tworzywo polimerowe
    odpady polimerowe
    recykling materiałowy
    mieszanina polimerowa
    separacja elektrostatyczna
    separator elektrostatyczny
    poli(chlorek winylu)
    PVC
    polilaktyd
    PLA
    polymer
    polymer waste
    material recycling
    polymer blend
    electrostatic separation
    electrostatic separator
    poly(vinyl chloride)
    polylactide
    poly(lactic acid)
    Opis:
    Separacja elektrostatyczna jest jedną ze znanych metod rozdziału mieszanin odpadów tworzyw polimerowych. W procesie tym wykorzystuje się różnicę właściwości tryboelektrycznych polimerów stanowiących daną mieszaninę. Efekty procesu separacji elektrostatycznej zależą od: (a) stopnia naelektryzowania poszczególnych cząsteczek mieszaniny oraz (b) skuteczności rozdziału naelektryzowanej mieszaniny w polu elektrostatycznym. W pracy przedstawiono wyniki badań procesu separacji elektrostatycznej dwuskładnikowych mieszanin tworzywowych o różnych zawartościach (10, 20, 30, 40, 50, 60, 70, 80 i 90% mas.) poli(chlorku winylu) (PVC) i polilaktydu (PLA). Oceniono zdolność naelektryzowania mieszaniny PVC/PLA, czystość oraz wydajność odzysku poszczególnych jej składników. Separację prowadzono za pomocą skonstruowanego przez nas prototypowego stanowiska badawczego, wyposażonego w elektrostatyczny separator walcowy.
    Electrostatic separation is the known method of plastics wastes separation. In this process the difference in triboelectric properties of polymers contained in the mixture are used. The effectiveness of the electrostatic separation process depends on: (a) degree of the electrification of individual mixture molecules and (b) separation of these mixture in a strong electrostatic field. The investigation results of an electrostatic separation process of binary polymeric blends with different (10, 20, 30, 40, 50, 60, 70, 80, and 90 wt%) contents of an polyvinyl chloride (PVC) and polylactide (PLA) are presented. The ability of the electrification of PVC/PLA mixtures, purity and yield of recovery of separated components, was evaluated. The separation was carried out by using a home-made prototype, equipped with a roll-type electrostatic separator.
    Źródło:
    Przetwórstwo Tworzyw; 2014, [R.] 20, nr 2 (158), 2 (158); 128-134
    1429-0472
    Pojawia się w:
    Przetwórstwo Tworzyw
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Salicylic acid release from chitosan pellets coated with polylactide
    Autorzy:
    Mucha, Maria
    Balcerzak, Jacek
    Filipiak, Adam
    Powiązania:
    https://bibliotekanauki.pl/articles/1035411.pdf
    Data publikacji:
    2011
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    chitosan
    first order kinetics
    polylactide
    prolonged drug release
    salicylic acid
    Opis:
    The aim of the study was to prepare a bi-polymer drug carrier composed of chitosan pellets (CS) coated with polylactide shell (PLA) providing prolonged model drug – salicylic acid (SA) release into phosphate buffer of pH = 7.2. Pellets were obtained through a coacervation followed by a freeze-drying process. In a terms of model drug loading, porous pellets were impregnated with a SA solution under vacuum. Afterwards, loaded and dried beads were coated with PLA films through their dipping in a PLA organic solution. FTIR spectroscopy was implemented to analyse the efectiveness of SA loading process. The UV-Vis spectrophotometry kinetic studies of a model drug release from PLA coated and non-coated pellets into phosphate buffer were conducted. Increasing time of CS pellets impregnation with SA solution resulted in decrease of salicylic acid release rate.This tendency was more evident for the SA release from pellets coated with an additional layer of PLA. Model drug release kinetic points were well approximated with first order kinetics model.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2011, 16; 79-88
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polylactide: from Synthesis and Modification to Final Properties
    Autorzy:
    Aniśko, Joanna
    Barczewski, Mateusz
    Powiązania:
    https://bibliotekanauki.pl/articles/2123282.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    modification
    PLA
    polylactide
    poly(lactic acid)
    composite
    Opis:
    The article reports ways and trends in polylactide (PLA) modification methods concerning literature data. The paper consists of two parts and presents the process of polylactide production, and the connection of changes in its properties with the polymer structure obtained thanks to appropriate process conditions and methods of its final polymer properties improvement. Discussing both the most advantageous properties and disadvantages, the possibilities of increasing the scope of its applicability in reference to selected modification methods were presented and discussed. The presented research results related to various modification methods arrange the knowledge from the discussed scope, indicating the best possible effects and limitations. The most considerable emphasis is on the methods and results obtained from heterogeneous nucleation and incorporating various fillers in the PLA matrix. The other methods, like applying chemical interaction methods (crosslinking, using chain extenders), development of polymer blends, copolymerization, and plasticization, are presented synthetically. In summary, the review present and organizes the achievements in the possibility of modifying the most prospective biodegradable polymer, which is PLA.
    Źródło:
    Advances in Science and Technology. Research Journal; 2021, 15, 3; 9--29
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Long-term mechanical testing of multifunctional composite fixation miniplates
    Autorzy:
    Gryń, Karol
    Powiązania:
    https://bibliotekanauki.pl/articles/1844969.pdf
    Data publikacji:
    2020
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    multifunctional composites
    fixation plates
    mechanical testing
    implant expiry date
    polylactide acid
    calcium-phosphate ceramics
    Opis:
    This paper presents the analysis and comparison of the results of mechanical testing of dumbbell-shaped specimens and multifunctional fixation miniplates made via injection forming. Three types of materials were used: a) polylactic acid; b) a composite made of a polylactic acid matrix modified with tricalcium phosphate β-TCP; c) a composite made of a polylactic acid matrix modified with a mixture of bioceramic powders of tricalcium phosphate β-TCP and hydroxyapatite HAp. All the samples were stored in normal conditions, no special treatment was applied. Tests were conducted right after samples were prepared and they were repeated two and four years after preparation. The values of basic mechanical parameters and stress-strain curves were recorded and analyzed. The attention was focused on changes in time of tensile strength and stiffness of materials and implants. It was discovered that having been stored for four years in the open air, without sunlight, with no hermetic sealing, and no sterilization, all the materials (PL38, PL38/TCP, PL38/TCP/HAp) showed slight changes in mechanical characteristics when compared to the data of the initial samples tested after fabrication. These changes were not critical and did not adversely affect either tensile strength or Young’s modulus of the implants. All the analyzed miniplates maintained their mechanical properties at an acceptable level, fulfilling requirements for fixation devices for osteosynthesis. Therefore, it was proposed that the expiry date of these implants can be indirectly determined, based on long-term mechanical testing.
    Źródło:
    Engineering of Biomaterials; 2020, 23, 157; 20-25
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kompozytowe włókna polilaktyd/hydroksyapatyt otrzymywane metodą przędzenia ze stopu
    Poly(lactic acid)/hydroxyapatite melt spun composite fibers
    Autorzy:
    Rajzer, I.
    Rom, M.
    Fabia, J.
    Morcinek, S.
    Zima, A.
    Ślósarczyk, A.
    Janicki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/283759.pdf
    Data publikacji:
    2009
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    polilaktyd
    hydroksyapatyt
    włókna
    podłoża
    polylactide acid
    hydroxyapatite
    fibers
    scaffold
    Opis:
    W pracy zaproponowano metodę produkcji nano-kompozytowych włókien na bazie polilaktydu (PLA) i nano-hydroksyapatytu (n-HAp).
    In the present work, the method of production of nanocomposite fibers based on polylactide acid (PLA) and nano-hydroxyapatite (n-HAp) is proposed.
    Źródło:
    Engineering of Biomaterials; 2009, 12, no. 89-91; 150-151
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Formulation of nimesulide-loaded polylactide/poly(lactic-co-glycolic acid) nanoparticles and the evaluation of release kinetics
    Formulacja nanocząstek polilaktyd/poli(kwas mlekowy-co-glikolowy) z nimesulidem oraz ocena kinetyki ich uwalniania
    Autorzy:
    Pobudkowska, A.
    Nosol, K.
    Gierycz, P.
    Domańska, U.
    Powiązania:
    https://bibliotekanauki.pl/articles/947047.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
    Tematy:
    nimesulide
    nanoparticles
    polylactide
    poly(lactic-co-glycolic acid)
    poly(vinyl alcohol)
    drug release
    nimesulid
    nanocząstki
    polilaktyd
    poli(kwas mlekowy-co-glikolowy)
    poli(alkohol winylowy)
    uwalnianie leku
    Opis:
    Polymeric nanoparticles containing nimesulide (NIM) were prepared by the emulsion solvent evaporation method. Biodegradable polymers were used as materials for nanoparticle formulations with the application of studies for the drug delivery sector in mind. Two analytical methods, scanning electron microscopy (SEM) and particle size analysis, were applied to investigate the obtained nanoparticles. Characteristic parameters were calculated to describe the amount of active pharmaceutical ingredient trapped in nanoparticles. The biological active substance release process was investigated under different conditions. The impact of various parameters [kind of polymer (PLA or PLGA), speed of mixing and especially of pH] is presented across our research.
    Polimerowe nanocząstki zawierające nimesulid (NIM) otrzymano metodą emulsyjną z odparowaniem rozpuszczalnika. Do ich wytworzenia wykorzystano biodegradowalne polimery. Wytworzone nanocząstki zbadano za pomocą skaningowej mikroskopii elektronowej (SEM) oraz analizatora wielkości cząstek. Obliczono charakterystyczne parametry opisujące ilość substancji farmaceutycznie aktywnej uwięzionej wewnątrz nanocząstek. Oceniono wpływ rodzaju polimeru stosowanego do kapsułkowania, szybkości mieszania suspensji, w szczególności pH środowiska na proces uwalniania substancji biologicznie czynnej.
    Źródło:
    Polimery; 2018, 63, 9; 586-593
    0032-2725
    Pojawia się w:
    Polimery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of thermal properties of polylactide
    Autorzy:
    Dobrakowski, Karol
    Kwiatkowski, Dariusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1179532.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    DSC
    PLA
    polylactic acid
    polylactide
    polymer
    Opis:
    The article contains information related to a material that is polylactide, also known as polylactic acid. The results of study presented in the article are related to the PLA moldings made with the use of the 65 - 160 C1 injection molding machine. The publication presents the results of thermal analysis obtained by using differential scanning calorimetry (DSC), thanks to which the thermal properties of polylactide were determined. The results that have been presented relate to the moldings obtained with different parameters of the injection molding process, while parameters such as the temperature of mold or injection molding are being changed during the process. Conducted examinations are aimed to determine the thermal properties.
    Źródło:
    World Scientific News; 2017, 76; 108-117
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biodegradowalne kompozyty polimerowe z nanocząstkami srebra i cząstkami naturalnymi na elementy sprzętu rehabilitacyjnego w weterynarii
    Biodegradable polymer composites with nanoparticles of silver and natural parts to the elements of rehabilitation equipment in veterinary medicine
    Autorzy:
    Sitek, N.
    Kuciel, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/278415.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Inżynierii Materiałów Polimerowych i Barwników
    Tematy:
    weterynaria
    sprzęt rehabilitacyjny
    biokompozyt
    kompozyt biodegradowalny
    kompozyt polimerowy
    polilaktyd
    cząstka naturalna
    nanocząstka srebra
    veterinary medicine
    rehabilitation equipment
    biocomposite
    biodegradable composite
    polymer composite
    polylactide
    poly(lactic acid)
    natural particle
    silver nanoparticle
    Opis:
    W pracy przedstawiono rezultaty badań nad nową koncepcją zastosowania biodegradowalnego kompozytu na osnowie polilaktydu z nanocząstkami srebra i cząstkami naturalnymi na wtryskiwane elementy sprzętu rehabilitacyjnego w weterynarii. Celem badań było opracowanie materiału, który jest trwały, w określonym czasie oraz przeciwbakteryjny, a po czasie jego użytkowania ulegnie naturalnej biodegradacji. Uzyskane wyniki wskazują na możliwość wykorzystania naturalnych napełniaczy do zwiększenia sztywności elementów oraz przyspieszenia ich degradacji. W zakończeniu zaproponowano wykorzystanie połączeń kształtowych do stworzenia szeregów takich elementów dla potrzeb sprzętu rehabilitacyjnego w weterynarii.
    The paper presents results of research on the new concept of the use of biodegradable polylactide matrix composite with silver nanoparticles and natural particles for injected elements of rehabilitation equipment in veterinary medicine. The aim of this study was to develop a material that is stable, at a specific time and antibacterial, and during its use will be inherently biodegradable. The results indicate the possibility of using natural fillers to increase the stiffness of components and to accelerate degradation. At the end of the connection, the proposed use to create a series of such components for the purpose of rehabilitation equipment in veterinary medicine.
    Źródło:
    Przetwórstwo Tworzyw; 2015, T. 21, Nr 3 (165), 3 (165); 285-289
    1429-0472
    Pojawia się w:
    Przetwórstwo Tworzyw
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the influence of electrospinning process parameters on the morphology of poly(lactic acid) fibres
    Autorzy:
    Matysiak, W.
    Kapica, A
    Tański, T.
    Dubiel, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/379142.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    nanofibres
    poly(lactic acid)
    polylactide
    PLA
    electrospinning
    nanowłókna
    poli(kwas mlekowy)
    polilaktyd
    elektroprzędzenie
    Opis:
    Purpose: The article focuses on the production of polymer nanofibres from poly(lactic acid) using the electro-spinning method, i.e. the technique of forming fibres in an electrostatic field. The main aim of the publication was to analyse the influence of the distance between electrodes on the morphology of one-dimensional polymeric materials obtained. Design/methodology/approach: In the practical part of the study solutions of polylactide in acetone and a mixture of chloroform/dimethylformamide (DMF) were produced. After 72 hours of mixing, no homogeneous solutions were obtained, therefore a solution consisting of a polylactide dissolved in chloroform was prepared, to which dimethylformamide was added in order to dilute the mixture. The morphology of the nanostructures obtained was analysed by means of a scanning electron microscope (SEM) equipped with an X-ray energy dispersion spectrometer (EDS), which allowed to analyse the chemical composition of the nanofibres produced. The electro-spinning method used to obtain fibres is characterized by high versatility - it gives the possibility to produce fibres from a wide range of polymers. Electro-spinning is also an economic method, and spinned fibres have a wide application potential. Findings: Nanofibres obtained by electro-spinning from the previously produced solution, regardless of the distance between the nozzle and the collector (10 or 20 cm) did not show any significant discrepancies in the values of measured diameters. Fibres obtained at increased distance between electrodes (20 cm) are characterized by a smaller average diameter value, but the difference is small, fluctuating between 48-49 nm. In the case of the sample formed during electro-spinning at the distance of the nozzle - collector equal to 10 cm and the sample produced at the distance doubled, no defects in the structure of the obtained nanofibres were observed. The analysis of topographic images of surfaces produced in the course of nanostructures' work did not show any significant influence of the distance between the nozzle and collector on the diameter of fibres. No defects in the structure of one-dimensional polymer materials obtained allowed to state that the distance between the nozzle and the collector in the range of 10-20 cm is the optimal parameter of the electro-spinning process allowing to obtain smooth, untangled fibres. Practical implications: The fibrous polymer mats obtained during the electro-spinning process of polylactide can be used as protective clothing materials, as drug delivery systems, as tissue scaffolding and as filtration membranes. Originality/value: At present, there are few articles in the literature on the electrospinning process, due to the fact that it is a constantly developing matte for the production of nanofibres. Moreover, most of the research focuses on fibres obtained from nonbiodegradable polymers, which do not have the advantages of fibres obtained from polylactide.
    Źródło:
    Archives of Materials Science and Engineering; 2019, 96, 2; 73-78
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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