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Wyszukujesz frazę "polylactic acid" wg kryterium: Temat

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    Wyświetlanie 1-10 z 10
    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:
    Effect of simulated body fluid on the microstructure of melt spun composite fibers
    Autorzy:
    Rajzer, I.
    Rom, M.
    Fabia, J.
    Sarna, E.
    Biniaś, D.
    Zima, A.
    Ślósarczyk, A.
    Janicki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/283899.pdf
    Data publikacji:
    2009
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    composites fibers
    simulated body fluid
    polylactic acid
    hydroxyapatite
    bone tissue regeneration
    Opis:
    Polylactic acid (PLA) offers unique features of biodegradability and thermal processability, that offer potential applications in medicine. PLA can be transformed into fibers by spinning enabling then subsequent fabrication of desirable three dimensional fabrics which may be used as scaffolds for tissue engineering applications. Incorporation of synthetic nano-hydroxyapatite into the fibrous polymer matrix can enhance bioactive properties of the prospective scaffold. In the present work, the method of production of composite fibers based on polylactic acid (PLA) and nano-hydroxyapatite (n-HAp) is proposed. Obtained fibers have shown excellent apatite-forming ability when immersed in simulated body fluid.
    Źródło:
    Engineering of Biomaterials; 2009, 12, 88; 2-4
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Time Distribution Analysis of 3D Prints with the Use of a Filament and Masked Stereolithography Resin 3D Printer
    Autorzy:
    Paśnikowska-Łukaszuk, Magdalena
    Korulczyk, Katarzyna
    Kapłon, Kamil
    Urzędowski, Arkadiusz
    Wlazło-Ćwiklińska, Magda
    Powiązania:
    https://bibliotekanauki.pl/articles/2204400.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    3D printing
    polylactic acid
    fused deposition modeling
    stereolithography
    masked stereolithography
    resin printing
    Opis:
    The article focuses on the subject of 3D printing. 3D printing technology and currently used solutions are described. The materials used in printing with the use of a filament printer and a resin printer are discussed. The fused deposiotion modeling technique and the LCD-based stereolithography. Printing technology were presented. Samples were prepared using 3D modeling software. The software used to make the models is discussed. The designed models were printed on two types of printers, using different model orientations. Printouts were measured several times. The obtained data was analyzed and the conclusions, proposed solutions and possible improvements to 3D printing were presented at the end. The article deals with the subject of the possibility of accelerating 3D prints due to their location, but also the influence of warming up the printer during subsequent prints was checked.
    Źródło:
    Advances in Science and Technology. Research Journal; 2022, 16, 5; 242--249
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the Structure of Low MolecularWeight Esters on Poly(lactic acid) in the Plasticization Process - part 1
    Autorzy:
    Gzyra-Jagieła, Karolina
    Sulak, Konrad
    Draczyński, Zbigniew
    Madej Kiełbik, Longina
    Jagodzińska, Sylwia
    Borkowski, Dominik
    Powiązania:
    https://bibliotekanauki.pl/articles/2171996.pdf
    Data publikacji:
    2022
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    polylactic acid
    plasticisation
    GPC/SEC
    gel permeation chromatography
    size exclusion chromatography
    citrate
    glycerol triacetate
    Opis:
    Polymers derived from renewable sources which are additionally subject to degradation processes are currently an interesting alternative to conventional polymers of petrochemical origin. One of such polymers is poly(lactic acid) (PLA), which can be used in the packaging, textile and also medical industries. Its great advantage is the susceptibility to biodegradation and the nontoxicity of the degradation products. Because of high brittleness and stiffness, the modification of PLA is necessary to improve its plastic deformability, which can expand the new application possibilities. As part of the research work, the modification of PLA by plasticisation was undertaken to improve its plastic deformability properties. The low molecular mass esters from the citrate group and glycerol triacetate were used. The samples extruded from plasticised polymer were characterised using Differential Scanning Calorimetry (DSC) and Gel Permeation Chromatography/Size Exclusion Chromatography (GPC/SEC). The mechanical properties and melt flow rate after modification were determined. The aim of the research was to determine the relationship between the structure of a plasticiser and its ability to reduce the interactions in the polymer chain in order to develop an optimal polymerplasticiser arrangement. Based on this research, there was no relationship between the efficiency of the plasticisation process and the increasing molecular mass of the plasticiser. The additional chemical (acetyl) group in the plasticiser also does not increase the efficiency of the PLA plasticisation process. In the next steps of the research, functional forms will be produced, i.e. fibers, films, and fittings from the selected polymer-plasticiser systems.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2022, 3 (151); 93--101
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Foto-biodegradowalne kompozyty poli (kwasu L-mlekowego) i TiO2
    Photo-biodegradable poly(L-lactic acid)/TiO2 nanocomposites
    Autorzy:
    Sobczyk-Guzenda, A.
    Owczarek, S.
    Kaczorowski, R.
    Gazicki-Lipman, M.
    Szymanowski, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/285260.pdf
    Data publikacji:
    2014
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    kompozyty
    polilaktyd
    TiO2
    metoda RF PECVD
    biodegradacja
    composites
    polylactic acid
    RF PECVD technique
    biodegradation
    Opis:
    Wielofunkcyjne kompozyty składające się z polimerów oraz nieorganicznych nanododatków zmieniające pierwotne właściwości polimeru są uznawane za nowoczesne materiały, które można wykorzystać w wielu dziedzinach przemysłu oraz życia codziennego. Wpływ nanonapełniacza na modyfikację właściwości matrycy polimerowej zależy w dużym stopniu od kształtu i wielkości jego cząstek, cech powierzchniowych oraz co za tym idzie stopnia jego dyspersji. W przedstawionej pracy wytworzono kompozyty składające się ditlenku tytanu (IV) TiO2 oraz poli(kwasu mlekowego) (PLA). Użyto zarówno niemodyfikowany TiO2 oraz modyfikowany metodą RF PECVD (Radio Frequency Plasma Enhanced Chemical Vapour Deposition). Proces ten przeprowadzono przy dwóch przepływach metanu 15 i 30 sccm. W celu sprawdzenia efektywności modyfikacji wykonano badanie FTIR (Fourier Transform Infrared Spectroscopy). Badanie to potwierdziło obecność na powierzchni ziaren TiO2 grup -CH2 i -CH3. Gotowe kompozyty poddano badaniom właściwości mechanicznych takich jak statyczna próba na rozciąganie oraz pomiar udarności. Otrzymane wyniki dowiodły, że dodatek TiO2 zarówno modyfikowanego jak i niemodyfikowanego nie zmienia wytrzymałości na rozciąganie natomiast poprawia jego udarność. Obecność niemodyfikowanego TiO2 w matrycy PLA obniża nieco wartość kąta zwilżania gotowego kompozytu, a modyfikacja powierzchni TiO2 w plazmie metanowej prowadzi do zmniejszenia zwilżalności produktu końcowego.
    Multifunctional composites consisting of polymers or inorganic nanoadditions, which change the original properties of a polymer are considered to be modern materials for many industrial and daily life applications. An influence of a nanofiller on modification process of polymer matrix properties is strongly dependent on its particles shape and size, surface characteristics and in consequence its dispersion grade. In the present work composites consisting of titanium dioxide (IV) TiO2 and polylactic acid (PLA) were prepared. Unmodified TiO2 as well as modified one by RF PECVD (Radio Frequency Plasma Enhanced Chemical Vapour Deposition ) technique were used. Two different methane flow rates (15 and 30 sccm) were used during processes. In order to check the efficiency of modification process FTiR (Fourier Transform Infrared Spectroscopy) research was conducted. The results show that there are -CH2 and -CH3 groups present at the TiO2 grains surface. Mechanical properties like tensile testing and impact resistance of the composites were measured. The results prove that an addition of TiO2 (modified and unmodified) does not influence the tensile strength but improves impact resistance value. A presence of unmodified TiO2 in PLA matrix slightly reduces the water contact angle value for a composite. Methane plasma surface treatment leads to wetting properties reduction of a final product.
    Źródło:
    Engineering of Biomaterials; 2014, 17, no. 128-129; 46-49
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Circular economy: comparative life cycle assessment of fossil polyethylene terephthalate (PET) and its recycled and bio-based counterparts
    Autorzy:
    Rybaczewska-Błażejowska, Magdalena
    Mena-Nieto, Angel
    Powiązania:
    https://bibliotekanauki.pl/articles/1841392.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    circular economy
    life cycle assessment
    LCA
    polyethylene terephthalate
    PET
    polylactic acid
    PLA
    recycled plastics
    sustainable consumption
    packaging waste management
    Opis:
    The transition to circular economy requires diversifying material sources, improving secondary raw materials management, including recycling, and finally finding sustainable alternative materials. Both recycled and bio-based plastics are often regarded as promising alternatives to conventional fossil-based plastics. Their broad application instead of fossilbased plastics is, however, frequently the subject of criticism because of offering limited environmental benefits. The study presents a comparative life cycle assessment (LCA) of fossil-based polyethylene terephthalate (PET) versus its recycled and bio-based counterparts. The system boundary covers the plastics manufacturing and end-of-life plastic management stages (cradle-to-cradle/grave variant). Based on the data and assumptions set out in the research, recycled PET (rPET) demonstrates the best environmental profile out of the evaluated plastics in all impact categories. The study contributes to circular economy in plastics by providing transparent and consistent knowledge on their environmental portfolio.
    Źródło:
    Management and Production Engineering Review; 2020, 11, 4; 121-128
    2080-8208
    2082-1344
    Pojawia się w:
    Management and Production Engineering Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    3D printed Polylactid Acid based porous scaffold for bone tissue engineering: an in vitro study
    Autorzy:
    Bodnárová, Simona
    Gromošová, Sylvia
    Hudák, Radovan
    Rosocha, Ján
    Živčák, Jozef
    Plšíková, Jana
    Vojtko, Marek
    Tóth, Teodor
    Harvanová, Denisa
    Ižariková, Gabriela
    Danišovič, Ľuboš
    Powiązania:
    https://bibliotekanauki.pl/articles/307547.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    kwas polimlekowy
    PLA
    drukowanie 3D
    inżynieria tkankowa
    polylactic acid
    3D printing
    porous scaffold
    periosteum-derived osteoprogenitors
    PDOs
    tissue engineering
    Opis:
    The objective of this study was to fabricate PLA-based porous scaffold by 3D printing technology and to evaluate their cytotoxicity and biocompatibility under in vitro conditions in respect to bone tissue engineering. Material and methods: Pure PLA in filamentous form was processed via 3D printing technology of fused filament fabrication into porous scaffolds. The structure and porosity of scaffolds were measured by metrotomography. PLA scaffolds were pre-treated by human serum, foetal bovine serum and complete cell culture medium to enhance bio-attractivity of the scaffold’s surface for the adherence of the cells. Cells were enzymatically isolated from the periosteum of the proximal tibia and then expanded in monolayer. Periosteum-derived osteoprogenitors (PDOs) were seeded on the pre-treated PLA scaffolds and subsequent cell proliferation was measured by commercially available cell proliferation assay. Adherence of PDOs on the PLA scaffold was confirmed by scanning electron microscopy (SEM). Results: Prepared scaffolds had well-defined structure and were characterized by uniform distribution of pores. They were non-toxic and biocompatible with PDOs, however, PLA scaffold with the periosteum-derived progenitor cells was significantly better in the group of scaffolds pre-treated with normal human serum. Conclusions: The obtained PLA porous scaffolds favored attachment of periosteum derived progenitors and proliferation, furthermore, cells penetrated into the scaffold through the interstitial pores which was meaningful for cytocompatibility evaluation.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2019, 21, 4; 101-110
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geo-textiles for Side Slope Protection: Preparation and Characteristics
    Geo-tekstylia do osłony zboczy: otrzymywanie i charakterystyka
    Autorzy:
    Hsieh, J.-C.
    Lin, C.-W.
    Lou, C.-W.
    Hsing, W.-H.
    Hsieh, C.-T.
    Kuo, C.-Y.
    Lin, J.-H.
    Powiązania:
    https://bibliotekanauki.pl/articles/231637.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    soil and water preservation
    vegetation blanket
    polylactic acid (PLA) fibers
    far-infrared fibers
    nonwoven fabrics
    gleba
    nawodnienie
    mata wegetacyjna
    podczerwień
    eko-włóknina
    Opis:
    The vegetation blanket is the most common choice for soil and water preservation. This is a feasible method that protects the land and environment according to basic agriculture and engineering theories. This study manufactured eco-friendly nonwoven vegetation blankets by using cotton fibers, far-infrared fibers, PLA fibers, and low melting-point fibers at a 1:1:7:1 ratio. This ratio yielded from the pilot study provides the resulting vegetation blankets’ optimum air permeability and water absorption. This study further finds that a needle-punching density of 30 needles/cm2 allows fibers to lie in a loose structure, and therefore yielding the optimum air permeability and water absorption. In plant growth evaluation, for nonwoven vegetation blankets that contain 50 wt% far-infrared fibers, the plant growth length is 1.3 times greater than that of blankets with 10 wt% far-infrared fibers. This result proves that far-infrared fibers have usually been applied to plant growth.
    Mata wegetacyjna jest najczęściej wybieraną formą ochrony zbocza dla zapewnienia odpowiedniego nawodnienia w celu wzrostu roślin. Jest to metoda, która chroni ziemię i środowisko naturalne zgodnie z zaleceniami nauk rolniczych. W artykule opisano otrzymywanie ekologicznej włókninowej maty wegetacyjnej z włókien bawełnianych, włókien ultraczułych na podczerwień, włókien polilaktydowych oraz włókien o niskiej temperaturze topnienia w stosunku 1:1:1:7. Wskaźnik ten, uzyskany z badania pilotażowego, zapewnia optymalną przepuszczalność powietrza i wchłanianie wody. Stwierdzono ponadto, że gęstość igłowania 30 igieł/cm2 umożliwia luźne ułożenie włókien, a więc pozwala na uzyskanie optymalnej przepuszczalności powietrza i absorpcji wody. W ocenie wzrostu roślin, na włókninowych matach wegetacyjnych, które zawierają 50% wagowych włókien ultraczułych na podczerwień, długość wzrostu roślin jest 1,3 razy większa, niż mat z 10% wagowymi włókien ultraczułych na podczerwień. Użycie włókien ultraczułych na podczerwień jest korzystne dla produkcji eko-włóknin zabezpieczających zbocza.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2017, 1 (121); 102-107
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The composting of PLA/HNT biodegradable composites as an eco-approach to the sustainability
    Autorzy:
    Czarnecka-Komorowska, Dorota
    Bryll, Katarzyna
    Kostecka, Ewelina
    Tomasik, Malgorzata
    Piesowicz, Elżbieta
    Gawdzińska, Katarzyna
    Powiązania:
    https://bibliotekanauki.pl/articles/2173590.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    polymer composite materials
    PMC
    biocomposites
    polylactic acid
    PLA
    halloysite
    composting process
    performance properties
    polimerowe materiały kompozytowe
    kwas polimlekowy
    biokompozyty
    proces kompostowania
    właściwości użytkowe
    haloizyt
    Opis:
    The article presents the results of the research related to the decomposition of polylactic acid (PLA)/halloysite nanotube (HNTs) biocomposites into a simple organic form. After manufacturing the nanocomposites, the evaluation of the composting process simulation was conducted using the biodegradation method. First, the selected properties of PLA/HNTs biocomposites, such as density, water absorption, and impact strength were tested. Next, the impact of the composting process on the behavior of PLA/HNTs composites was investigated from 30 to 90 days. Finally, the loss of mass of the composites, hardness, and the structural changes of biocomposites under the composting conditions before and after the composting were evaluated using SEM microscopy. The results showed that the PLA modified by HNT particles has biodegradation-friendly properties and therein is fully suitable for organic recycling. Due to this, in the coming years, it may contribute to the replacement of non-biodegradability polymers, i.e. polyolefins and polyesters, and reduction of plastic packaging wastes.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 2; art. no. e136720
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The composting of PLA/HNT biodegradable composites as an eco-approach to the sustainability
    Autorzy:
    Czarnecka-Komorowska, Dorota
    Bryll, Katarzyna
    Kostecka, Ewelina
    Tomasik, Malgorzata
    Piesowicz, Elżbieta
    Gawdzińska, Katarzyna
    Powiązania:
    https://bibliotekanauki.pl/articles/2090722.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    polymer composite materials
    PMC
    biocomposites
    polylactic acid
    PLA
    halloysite
    composting process
    performance properties
    polimerowe materiały kompozytowe
    kwas polimlekowy
    biokompozyty
    proces kompostowania
    właściwości użytkowe
    haloizyt
    Opis:
    The article presents the results of the research related to the decomposition of polylactic acid (PLA)/halloysite nanotube (HNTs) biocomposites into a simple organic form. After manufacturing the nanocomposites, the evaluation of the composting process simulation was conducted using the biodegradation method. First, the selected properties of PLA/HNTs biocomposites, such as density, water absorption, and impact strength were tested. Next, the impact of the composting process on the behavior of PLA/HNTs composites was investigated from 30 to 90 days. Finally, the loss of mass of the composites, hardness, and the structural changes of biocomposites under the composting conditions before and after the composting were evaluated using SEM microscopy. The results showed that the PLA modified by HNT particles has biodegradation-friendly properties and therein is fully suitable for organic recycling. Due to this, in the coming years, it may contribute to the replacement of non-biodegradability polymers, i.e. polyolefins and polyesters, and reduction of plastic packaging wastes.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 2; e136720, 1--13
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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