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    Wyświetlanie 1-8 z 8
    Tytuł:
    Kinetics of active substance release from flat biopolymer multilayer films
    Autorzy:
    Michalak, Iwona
    Traczyk, Dariusz
    Mucha, Maria
    Powiązania:
    https://bibliotekanauki.pl/articles/1035524.pdf
    Data publikacji:
    2010
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    chitosan
    drug release
    polylactid
    polymer films
    swelling kinetics
    Opis:
    Abstract. Polymer films were made of different biodegradable materials. Solid support of model active substance (salicylic acid) was unmodified and modified (crosslinked with glutaraldehyde) chitosan and outside layers were polylactid acid (PLA). The aim of the study was to obtain the controlled release kinetics of active substance, in medium of pH 5.6 which is similar to conditions occurring on the human skin surface. The chitosan films were investigated with swelling kinetics while multilayer films were studied with release kinetics of active substance (salicylic acid). The amount of salicylic acid released from film was measured using a UV-VIS spectrophotometer. The appropriate mathematical model was also adjusted to the experimental points. The results prove that the swelling process follows the first order kinetics but the results of release process are fitted with Peppas model.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2010, 15; 107-116
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New materials based on hyaluronic acid and egg albumin mixture
    Autorzy:
    Gadomska, Magdalena
    Musiał, Katarzyna
    Sionkowska, Alina
    Powiązania:
    https://bibliotekanauki.pl/articles/1844862.pdf
    Data publikacji:
    2021
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    hyaluronic acid
    albumin from chicken egg
    mechanical properties
    polymer films
    Opis:
    In this work, new materials based on the mixture of hyaluronic acid and albumin from chicken eggs have been studied. Tests were carried out to determine the molecular weight of the tested hyaluronic acids. The properties of hyaluronic acid were investigated and significant differences were found in the mechanical properties of the tested compound, depending on its molecular weight. It was found that egg albumin can be combined with hyaluronic acid and thin films can be obtained. Spectrometric tests were performed both for pure compounds and for mixtures of hyaluronic acid with chicken egg albumin. IR spectroscopy showed that interactions between hyaluronic acid and egg albumin are mainly by hydrogen bonds, as the shifts in the main bands in IR spectra were observed. The addition of egg albumin to hyaluronic acid leads to the decrease of its mechanical properties. The deterioration of the mechanical properties of polymer films from HA-albumin mixtures may be due to interactions between compounds which were shown in the IR spectra. The thin films based on hyaluronic acid and egg albumin blend can be used as adhesive materials in biomedicine and cosmetics. Both biopolymers are biocompatible and biodegradable so we can expect a biocompatible and biodegradable material for potential application as adhesives.
    Źródło:
    Engineering of Biomaterials; 2021, 4, 160; 15-21
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Materials based on chitosan enriched with zinc nanoparticles for potential applications on the skin
    Autorzy:
    Kulka, Karolina
    Szmejkowska, Andżelika
    Sionkowska, Alina
    Wypij, Magdalena
    Golińska, Patrycja
    Powiązania:
    https://bibliotekanauki.pl/articles/27324035.pdf
    Data publikacji:
    2022
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    chitosan
    zinc oxide nanoparticles
    polymer films
    antimicrobial activity
    chitozan
    biomateriały
    biodegradowalność
    Opis:
    Chitosan as a nontoxic, biodegradable, and biocompatible biopolymer with film-forming properties can also be modified to improve its parameters. Modification of polymer films by the addition of nanoparticles is an increasingly common solution due to the higher efficiency of products at the nanoscale compared to the macroscale. In this work, thin chitosan films enriched with biogenic zinc oxide nanoparticles (ZnONPs) from Fusarium solani IOR 825 were obtained by the solvent evaporation method. The influence of nanoadditive on the physicochemical, mechanical, and antimicrobial properties of the polymeric matrix was evaluated. Two different concentrations of ZnONPs were added to the chitosan solution. Spectrometric measurements, mechanical tests, microscopic imaging, and microbiological tests were performed for nanoparticlesmodified and control samples. Analysis revealed that ZnONPs influence the properties of chitosan films. FTIR spectroscopy showed changes that are the result of interactions between polymer matrix and the additive. Modified samples were characterized by increased values of Young’s modulus and tensile strength. SEM analysis combined with energy-dispersive X-ray spectrometry confirmed the presence of zinc in the modified films. The addition of nanoparticles slightly affected the surface morphology of the tested samples, and an increase in roughness was observed. Microbiological tests showed the biostatic activity of the films containing ZnONPs. The obtained films based on chitosan with the addition of ZnONPs can be considered easy-to-obtain biomaterials with potential use as cosmetic and biomedical products.
    Źródło:
    Engineering of Biomaterials; 2022, 25, 167; 24--31
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characteristic of fish collagen films cross-linked with glutaraldehyde
    Autorzy:
    Kulka-Kamińska, Karolina
    Brudzyńska, Patrycja
    Sionkowska, Alina
    Lewandowska, Katarzyna
    Piwowarski, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/27324037.pdf
    Data publikacji:
    2023
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    collagen
    glutaraldehyde
    cross-linking
    polymer films
    marine sources
    kolagen
    biomateriały
    polimery
    Opis:
    Collagen is a valuable biopolymer in many fields, especially in biomedical sciences. Thanks to its biodegradability and high biocompatibility, it is a desirable material for applications that require contact with the human body. There are many sources of collagen, of which marine-origin collagen has become an important one in recent times. Pure collagen has poor stability and is sensitive to the effects of heat and other external factors. The cross-linking process can improve the properties of collagen materials. Many different methods of cross-linking can be distinguished, including chemical ones. In this study, we were concerned to obtain collagen films modified with glutaraldehyde (GTA). The influence of this additive on the chemical, mechanical, swelling, and hydrophilic properties of the biopolymeric matrix was evaluated. Two different concentrations of collagen were used, as well as three different concentrations of GTA. Results of the analysis showed that the properties of the obtained films were affected by the addition of even a small amount of cross-linker. Spectroscopic measurements indicated minor changes that reflect interactions between GTA and the collagen matrix. Mechanical tests showed changes for modified samples in values of tensile strength, breaking force, and elongation at break. The hydrophilicity decreased slightly for films with GTA. The durability of the modified samples in the swelling test increased. Differences between 1% and 2% collagen films with additives were also observed. The GTA-obtained fish collagen films can be promising materials for biomedical applications.
    Źródło:
    Engineering of Biomaterials; 2023, 26, 168; 25--32
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wielowarstwowe filmy polimerowe otrzymywane metodą LbL - warstwa po warstwie (ang. layer-bylayer) : rozwój i zastosowanie
    Multilayered polymer films obtained by means of layer-by-layer (LbL) method : evolution and applications
    Autorzy:
    Wójcik, A.J.
    Powiązania:
    https://bibliotekanauki.pl/articles/171608.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    metoda LbL
    warstwa po warstwie
    filmy polimerowe
    polielektrolity
    LbL
    layer-by-layer
    polymer films
    polyelectrolytes
    Opis:
    The production of varied materials with nanoscale precision requires both suitable components and a right method. In the past two decades, layer-by-layer (LbL) assembly has been proven to be a convenient and versatile technique for fabrication of functional films. The LbL method enables obtaining systems composed of a few or even hundreds layers of beforehand chosen substances, which are characterized by a thickness ranging from nano- to micrometers. The building blocks of LbL assembly include, but are not limited to, synthetic polymers, polymeric microgels, biomacromolecules, (nano)particles, dendritic molecules, and complexes of these species [1]. This method involves simple alternative adsorption of oppositely charged polyelectrolytes on supporting materials [2]. The LbL assembly can be driven by multiple weak interactions, including electrostatic interactions, hydrogen-bonds, halogen-bonds, coordination bonds, charge-transfer interactions, biospecific interactions (e.g., sugar–lectin interactions), cation–dipole interactions, and the combined interaction of the above forces, etc. The multilayered composite films fabricated by means of the LbL technique have generated much interest among researchers worldwide due to the simplicity of the whole process by which they are produced and their numerous applications such as antireflection coatings, superhydrophobic surfaces, electrochromic devices, biosensors, cell adhesion or resistance coatings, drug delivery systems, proton exchange membranes, solar-energy conversion devices, and separation membranes [3]. In this review the evolution of the LbL method and the applications of the multilayered polymer films were discussed.
    Źródło:
    Wiadomości Chemiczne; 2014, 68, 9-10; 897-918
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molecular modeling as a novel and promising numerical tool in microelectronics packaging
    Autorzy:
    Matkowski, P.
    Wymysłowski, A.
    Felba, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/378423.pdf
    Data publikacji:
    2006
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Elektronowej
    Tematy:
    modelowanie molekularne
    upakowanie
    kompozyty polimerowe
    cienka warstwa
    microelectronic packaging
    molecular modelling
    polymer composites
    thin films
    Opis:
    Numerical modeling is a widespread tool in microelectronics, which is used generally for support of the prototyping stage. One of the novel numerical tools that are currently emerging is technique based on molecular modeling. Molecular modeling is well known and utilized method in chemistry, biology, medicine, biotechnology, pharmacy and physics. Scientists and researchers have been using molecular modeling to simulate reactions at the molecular levels for many years. Additionally molecular modeling is used in e.g. material modeling. Scientists are interested in material modeling and simulations because of complexity of novel materials. Many novel materials include fillers or particular structure that ensures its mechanical or electrical properties. Molecular modeling and simulations enables to control structure and properties of the materials in the nano-scale. By conducting molecular modeling researchers can obtain proposals of materials that vary in properties by low costs. Molecular modeling also ensures control of processes and prediction possibility. The current paper is focused on possible areas of application of molecular modeling in microelectronic packaging. The paper describes the current state-of-the-art and benefits of molecular modeling to selected problems common in microelectronic packages. Our goal in the future is to apply molecular modeling, as a support tool, to resolve problems that occur in microelectronic packaging as e.g. problem of surface phenomena, thin films, viscoelasticity or mechanical and thermal properties of novel materials and compounds.
    Źródło:
    Electron Technology : Internet Journal; 2005-2006, 37/38, 14; 1-6
    1897-2381
    Pojawia się w:
    Electron Technology : Internet Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cechy geometryczne folii polimerowych wytwarzanych w procesie wytłaczania z rozdmuchiwaniem
    Geometrical properties of polymer films produced in blown molding extrusion process
    Autorzy:
    Garbacz, T.
    Palutkiewicz, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/279148.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Inżynierii Materiałów Polimerowych i Barwników
    Tematy:
    tworzywo termoplastyczne
    wytłaczanie z rozdmuchiwaniem
    rozciąganie folii
    właściwości geometryczne folii
    thermoplastic polymer
    blow moulding extrusion
    film stretching
    geometric properties of films
    Opis:
    Właściwości folii wytwarzanej metodą wytłaczania z rozdmuchiwaniem można ocenić na podstawie stopnia rozciągania folii w kierunku poprzecznym, stopnia rozciągania w kierunku wzdłużnym oraz parametrów geometrycznych, to jest grubości i szerokości folii. Właściwości te zależą w dużej mierze od warunków technologicznych procesu, geometrii oraz konstrukcji głowicy wytłaczarskiej, jak również rodzaju tworzywa. W pracy przedstawiono charakterystykę procesu wytłaczania z rozdmuchiwaniem folii jednowarstwowej przy zastosowaniu trzech rodzajów tworzyw poliolefinowych. Zaprezentowano badania wpływu zmiany warunków technologicznych procesu przetwórstwa na parametry charakteryzujące rozciąganie rozdmuchiwanej folii oraz jej właściwości geometryczne.
    Properties of the films produced by extrusion blow molding can be evaluated by the degree of stretching the film in the cross direction and stretch ratio in the longitudinal direction and geometric parameters, i.e. the thickness and width of the film. These properties depend on the conditions of the technological process, geometry and construction of extrusion head as well as the type of polymer. Process of extrusion blow-molding single-layer films using three types of polyolefins was described. Measurements and studies of the impact of changes in the conditions of technological process of processing parameters characterizing the stretch blown film and geometrical characteristics of the resulting single-layer films were used.
    Źródło:
    Przetwórstwo Tworzyw; 2016, T. 22, Nr 3 (171), 3 (171); 116-125
    1429-0472
    Pojawia się w:
    Przetwórstwo Tworzyw
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of calcium carbonate and its modifications on the extrusion process and selected properties of polypropylene cast films
    Wpływ węglanu wapnia i jego modyfikacji na proces wytłaczania oraz wybrane właściwości użytkowe wylewanych folii polipropylenowych
    Autorzy:
    Kloziński, Arkadiusz
    Szczepańska, Małgorzata
    Jakubowska, Paulina
    Samujło, Bronisław
    Barczewski, Mateusz
    Lota, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/2202587.pdf
    Data publikacji:
    2022
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
    Tematy:
    polypropylene
    calcium carbonate
    polymer composites
    extrusion
    films
    tensile strength
    extensional viscosity
    haze
    gloss
    polipropylen
    węglan wapnia
    kompozyty polimerowe
    wytłaczanie
    folie
    wytrzymałość na rozciąganie
    lepkość wzdłużna
    zamglenie
    połysk
    Opis:
    The effect of unmodified and stearic acid-modified calcium carbonate (5, 10, 20 and 30 wt%) on selected properties (tensile strength, puncture resistance, haze and gloss) and processability of polypropylene films (MVR, extensional viscosity) was investigated. The composites were obtained in the twin-screw extrusion process with cold granulation, and the films in the single-screw extrusion process, using a flat die head (so-called cast films) and a chill roll type cooling and pull-back device. It has been shown that stearic acid is an effective modifier of polypropylene processing properties both under shear and tensile flow conditions (lower extensional viscosity of films containing modified calcium carbonate).
    Zbadano wpływ dodatku 5, 10, 20 oraz 30 % mas. niemodyfikowanego imodyfikowanego kwasem stearynowym węglanu wapnia na wybrane właściwości użytkowe (wytrzymałość na rozciąganie, odporność na przebicie, zamglenie, połysk) iprzetwórcze folii polipropylenowych (MVR, lepkość wzdłużna). Kompozyty otrzymano w procesie dwuślimakowego wytłaczania z granulacją na zimno, a folie w procesie jednoślimakowego wytłaczania, przy użyciu głowicy płaskiej (tzw. cast films) oraz urządzenia chłodząco - odciągającego typu chill roll. Wykazano, że kwas stearynowy jest efektywnym modyfikatorem właściwości przetwórczych folii polipropylenowych zarówno w warunkach przepływu ścinającego, jak i rozciągającego (mniejsza lepkość wzdłużna folii zawierających modyfikowany węglan wapnia).
    Źródło:
    Polimery; 2022, 67, 10; 509--521
    0032-2725
    Pojawia się w:
    Polimery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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