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Littérature scientifique sur le sujet « Polylactide- Synthesis »

Auteur : Grafiati
Publié le 6 septembre 2023

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Articles de revues sur le sujet "Polylactide- Synthesis"

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Li, Yong Fei, Qin Wu et Mei Li Gao. « Synthesis of Stereoregular Polylactide ». Advanced Materials Research 391-392 (décembre 2011) : 107–10. http://dx.doi.org/10.4028/www.scientific.net/amr.391-392.107.

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The paper studied polymerization of rac-lactide catalyzed by a diketiminato aluminum alkoxide complex. The aluminum alkoxide complex bearing bulky isopropyl ortho substituents showed moderate activity for the rac-lactide polymerization. Microstructural study of polymer generated with the aluminum catalyst reveals that syndiotactic polylactide were produced. Results have shown that the conversion of lactide depend on the monomer/catalyst feed ratio and the reaction temperature.
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Bero, M., P. Dobrzy?ski et J. Kasperczyk. « Synthesis of disyndiotactic polylactide ». Journal of Polymer Science Part A : Polymer Chemistry 37, no 22 (15 novembre 1999) : 4038–42. http://dx.doi.org/10.1002/(sici)1099-0518(19991115)37:22<4038 ::aid-pola2>3.0.co;2-f.

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Li, Ge, Menghui Zhao, Fei Xu, Bo Yang, Xiangyu Li, Xiangxue Meng, Lesheng Teng, Fengying Sun et Youxin Li. « Synthesis and Biological Application of Polylactic Acid ». Molecules 25, no 21 (29 octobre 2020) : 5023. http://dx.doi.org/10.3390/molecules25215023.

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Over the past few decades, with the development of science and technology, the field of biomedicine has rapidly developed, especially with respect to biomedical materials. Low toxicity and good biocompatibility have always been key targets in the development and application of biomedical materials. As a degradable and environmentally friendly polymer, polylactic acid, also known as polylactide, is favored by researchers and has been used as a commercial material in various studies. Lactic acid, as a synthetic raw material of polylactic acid, can only be obtained by sugar fermentation. Good biocompatibility and biodegradability have led it to be approved by the U.S. Food and Drug Administration (FDA) as a biomedical material. Polylactic acid has good physical properties, and its modification can optimize its properties to a certain extent. Polylactic acid blocks and blends play significant roles in drug delivery, implants, and tissue engineering to great effect. This article describes the synthesis of polylactic acid (PLA) and its raw materials, physical properties, degradation, modification, and applications in the field of biomedicine. It aims to contribute to the important knowledge and development of PLA in biomedical applications.
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Nakajima, Hajime, Tomoko Fujiwara, Chan Woo Lee et Yoshiharu Kimura. « Synthesis of Silyl-Terminated Polylactides for Controlled Surface Immobilization of Polylactide Macromolecular Chains ». Biomacromolecules 12, no 11 (14 novembre 2011) : 4036–43. http://dx.doi.org/10.1021/bm2010388.

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Peng, Ya-Liu, Yong Huang, Hui-Ju Chuang, Chen-Yuan Kuo et Chu-Chieh Lin. « Synthesis and characterization of biodegradable polylactides and polylactide-block-poly(Z-lysine) copolymers ». Polymer 51, no 19 (septembre 2010) : 4329–35. http://dx.doi.org/10.1016/j.polymer.2010.07.016.

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Demina, T. S., T. A. Akopova et A. N. Zelenetsky. « Materials Based on Chitosan and Polylactide : From Biodegradable Plastics to Tissue Engineering Constructions ». Polymer Science, Series C 63, no 2 (septembre 2021) : 219–26. http://dx.doi.org/10.1134/s1811238221020028.

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Abstract The transition to green chemistry and biodegradable polymers is a logical stage in the development of modern chemical science and technology. In the framework of this review, the advantages, disadvantages, and potential of biodegradable polymers of synthetic and natural origin are compared using the example of polylactide and chitosan as traditional representatives of these classes of polymers, and the possibilities of their combination via obtaining composite materials or copolymers are assessed. The mechanochemical approach to the synthesis of graft copolymers of chitosan with oligolactides/polylactides is considered in more detail.
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Tazhbayev, Ye M., A. R. Galiyeva, T. S. Zhumagaliyeva, M. Zh Burkeyev, A. T. Kazhmuratova, E. Zh Zhakupbekova, L. Zh Zhaparova et A. A. Bakibayev. « Synthesis and characterization of isoniazid immobilized polylactide-co-glycolide nanoparticles ». Bulletin of the Karaganda University. "Chemistry" series 101, no 1 (30 mars 2021) : 61–70. http://dx.doi.org/10.31489/2021ch1/61-70.

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This article considers someaspects of synthesis and characterizationof polylactide-co-glycolide nanoparticles immobilized withthe antituberculous drug isoniazid. The influence of some synthesis parameters of nanoparticles (the ratio of drug substance:polymer and surfactant concentration) onproperties of the obtained nanosomal drug form of isoniazid has been studied. Optimal conditions for obtainingthenanoparticles with the best physicochemical parameters such as: particle size, polydispersity, conversion, etc. have been found. These nanoparticlescan be used asdrug carriers.The results revealed thata polymer: drug ratio of 1:1 and the use of 3% Twin 80 are necessaryto obtain stable emulsions of nanoparticles of polylactide-co-glycolide with satisfactory characteristics. Average size of the obtained particles was 196.4 nm,and the polydispersity value was 0.323. The aggregation stability of nanoparticles during 4 hours at temperatures of 4ºC and 20ºC has been evaluated. The morphology of the obtained nanoparticles has been studied.Analysis of nanoparticles was characterized by various instrumental methods includinggas chromatography and thermogravimetrytechniques. The resulting nanoparticles of polylactide-co-glycolide immobilized with isoniazid are stable in time andcanprolong the action of the drug. In vitrorelease of isoniazid from polylactide-co-glycolide nanoparticles hasbeen studied.
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Fang, Chu, Xuehui Wang, Xuesi Chen et Zhigang Wang. « Mild synthesis of environment-friendly thermoplastic triblock copolymer elastomers through combination of ring-opening and RAFT polymerization ». Polymer Chemistry 10, no 26 (2019) : 3610–20. http://dx.doi.org/10.1039/c9py00654k.

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Benjamin Neoh, Di-Shen, Siti Fairus Mohd Yusoff, Takeno Akiyoshi, Takahashi Shinya et Farah Hannan Anuar. « Synthesis of Hydroxylated Polyisoprene-graft-Polylactide Copolymer ». Sains Malaysiana 49, no 11 (30 novembre 2020) : 2689–98. http://dx.doi.org/10.17576/jsm-2020-4911-08.

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Popelka, Štěpán, et František Rypáček. « Synthesis of Polylactide with Thiol End Groups ». Collection of Czechoslovak Chemical Communications 68, no 6 (2003) : 1131–40. http://dx.doi.org/10.1135/cccc20031131.

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Four synthetic routes to poly(L-lactide) with thiol end groups based on ring-opening polymerization of L-lactide (LA) catalysed with tin(II) 2-ethylhexanoate (Sn(Oct)2) are reported. The following alcohols were used as co-initiators of polymerization: 2-sulfanylethan-1-ol, 2-[(2,4-dinitrophenyl)sulfanyl]ethan-1-ol, 2-(tritylsulfanyl)ethan-1-ol and allyl alcohol. End groups introduced into polymers by co-initiators were transformed to thiol groups by a subsequent modification reaction. The efficiencies of the used synthetic methods were evaluated and discussed. The best results were obtained with co-initiator 2-(tritylsulfanyl)ethan-1-ol.
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Thèses sur le sujet "Polylactide- Synthesis"

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Nelson, Warren W. « Synthesis and Characterization of Polylactide/Polyimide Blends ». University of Cincinnati / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1282575053.

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Ragheb, Ragy Tadros. « Synthesis and Characterization of Surface-Functionalized Magnetic Polylactide Nanospheres ». Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/26719.

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Polylactide homopolymers with pendent carboxylic acid functional groups have been designed and synthesized to be studied as magnetite nanoparticle dispersion stabilizers. Magnetic nanoparticles are of interest for a variety of biomedical applications including magnetic field-directed drug delivery and magnetic cell separations. Small magnetite nanoparticles are desirable due to their established biocompatibility and superparamagnetic (lack of magnetic hysteresis) behavior. For in-vivo applications, it is important that the magnetic material be coated with biocompatible organic materials to afford dispersion characteristics or to further modify the surfaces of the complexes with biospecific moieties. The acid-functionalized silane endgroup was utilized as the dispersant anchor to adsorb onto magnetite nanoparticle surfaces and allowed the polylactide to extend into various solvents to impart dispersion stability. The homopolymers were complexed with magnetite nanoparticles by electrostatic adsorption of the carboxylates onto the iron oxide surfaces, and these complexes were dispersible in dichloromethane. The polylactide tailblocks extended into the dichloromethane and provided steric repulsion between the magnetite-polymer complexes. The resultant magnetite-polymer complexes were further incorporated into controlled-size nanospheres. The complexes were blended with poly(ethylene oxide-b-D,L-lactide) diblock copolymers to introduce hydrophilicity on the surface of the nanospheres with tailored functionality. Self-assembly of the PEO block to the surface of the nanosphere was established by utilizing an amine terminus on the PEO to react with FITC and noting fluorescence.
Ph. D.
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Lindman, Jonas. « Synthesis of functional polylactide : Monomer synthesis scale-up and poly(ethylene glycol) functionalization ». Thesis, KTH, Skolan för kemivetenskap (CHE), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-207175.

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This master’s degree project optimized the synthesis route to a functional lactide by increasing the total yield from 25 to 33 % and reducing the number of unit operations from 17 to 10. This was done by optimizing an existing synthetic pathway to better fit larger scale manufacturing. The monomer was also successfully copolymerized with ʟ-lactide and functionalized by attaching poly(ethylene glycol) units of varying chain lengths to the polylactide chain, which gives some antifouling properties to the copolymer. The resulting material, a functionalized polylactide, is an interesting material suitable for the use in medical implats, largely thanks to its versatility and ability to be tailored for a specific purpose.
I detta examensarbete optimerades en syntesväg till en funktionaliserad laktid genom att öka utbytet från 25 till 33 % samt minska antalet enhetsoperationer från 17 till 10 st. Detta gjordes genom att anpassa en befintlig syntesväg till tillverkning i större skala. Monomeren sampolymeriserades även med ʟ-laktid och funktionaliserades genom att polyetylenglykol av varierande kedjelängd fästes till polylaktidkedjan, vilket gav en hämmande effekt på celladheransen till materialets yta. Det resulterande materialet: En funktionaliserad polylaktid, är ett intressant material som lämpar sig för användning i medicinska implantat, mycket tack vare sin mångsidighet och möjligheten att utforma materialen för specifika ändamål.
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Jing, Feng. « Synthesis and characterization of polylactide derivatives with high glass transition temperatures ». Diss., Connect to online resource - MSU authorized users, 2006.

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Ragheb, Ragy. « Synthesis and Characterization of Polylactide-siloxane Block Copolymers as Magnetite Nanoparticle Dispersion Stabilizers ». Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/31687.

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Polylactide-siloxane triblock copolymers with pendent carboxylic acid functional groups have been designed and synthesized for study as magnetite nanoparticle dispersion stabilizers. Magnetic nanoparticles are of interest in a variety of biomedical applications, including magnetic field-directed drug delivery and magnetic cell separations. Small magnetite nanoparticles are desirable due to their established biocompatibility and superparamagnetic (lack of magnetic hysteresis) behavior. For in-vivo applications it is important that the magnetic material be coated with biocompatible organic materials to afford dispersion characteristics or to further modify the surfaces of the complexes with biospecific moieties.

The synthesis of the triblock copolymers is comprised of three reactions. Difunctional, controlled molecular weight polymethylvinylsiloxane oligomers with either aminopropyl or hydroxybutyl endgroups were prepared in ring-opening redistribution reactions. These oligomers were utilized as macroinitiators for ring-opening L-lactide to provide triblock materials with polymethylvinylsiloxane central blocks and poly(L-lactide) endblocks. The molecular weights of the poly(L-lactide) endblocks were controlled by the mass of L-lactide relative to the moles of macroinitiator. The vinyl groups on the polysiloxane center block were further functionalized with carboxylic acid groups by adding mercaptoacetic acid across the pendent double bonds in an ene-thiol free radical reaction. The carboxylic acid functional siloxane central block was designed to bind to the surfaces of magnetite nanoparticles, while the poly(L-lactide)s served as tailblocks to provide dispersion stabilization in solvents for the poly(L-lactide). The copolymers were complexed with magnetite nanoparticles by electrostatic adsorption of the carboxylates onto the iron oxide surfaces and these complexes were dispersible in dichloromethane. The poly(L-lactide) tailblocks extended into the dichloromethane and provided steric repulsion between the magnetite-polymer complexes.
Master of Science

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Bolakhrif, Sabah. « Synthesis and application of PLA and PLA/GO fibers through thermo-responsive transformation of PLA particles ». Thesis, KTH, Skolan för kemivetenskap (CHE), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-207578.

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PLA nanofibers were successively produced by thermo-responsive transformation of PLA particles in water. The morphological structure of the nanofibers could be optimized by the heat treatment as well as the incorporation of GO to the fiber surface. PLA/GO fiber demonstrated a more stable morphology and GO provided good compatibility between PLA and starch. Both PLA and PLA/GO fibers incorporated in starch films resulted in increased thermal stability and mechanical properties. However, the most favorable properties were assigned starch films containing high concentration of PLA/GO fibers. These films with completely green components could possibly be utilized in biodegradable packaging applications.
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Rieger, Jutta. « Synthesis, characterization and biomedical interest of amphiphilic biocompatible and bioeliminable (glyco)copolymers of various architectures ». Université Joseph Fourier (Grenoble), 2006. http://www.theses.fr/2006GRE10038.

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Ce travail a pour objectif principal la modification de la surface de nanoparticules de polymères par de nouveaux copolymères amphiphiles et biocompatibles, possédant différentes architectures. Les copolymères considérés dans cette étude sont composés d'une chaine hydrophile de poly(oxyde d'éthylène) (POE) et d'une chaîne hydrophobe à base de poly(ε-caprolactone) (PCL). A partir d'un POE coiffé par une unité ε-caprolactone et par un groupement méthoxy à ses extrémités α et ω, respectivement, (γPOE. CL), des copolymères amphiphiles greffés, PCL-g-POE, et un copolymère ternaire possédant une architecture en étoile ont été synthétisés. Des copolymères diblocs, POE-b-PCL, ont également été préparés. Les copolymères diblocs et greffés de POE et PCL, tensioactifs, ont été utilisés pour stabiliser et modifier la surface de nanoparticles polymères (NP), vecteurs potentiels pour la délivrance de principes actifs. L'effet des propriétés des copolymères (architecture, composition et quantité) sur la formation et la structure des nanoparticules, a été examiné. De plus, l'activation du complément, c. -à. -d. La furtivité des nanoparticules, en fonction de la composition et de l'architecture du copolymère utilisé a été étudiée. Un autre défi relevé dans ce travail est la fonctionnalisation de la surface de nanoparticules pas des motifs mannose afin de cibler des cellules dendritiques. A cet effet, des dérivés du mannose ont été fixés de manière covalente à l'extrémité de la poly(ε-caprolactone) et de copolymères diblocs POE-b-PCL. Ces derniers ont été utilisés avec succès pour modifier la surface de nanoparticules de polylactide
This work mainly aims at modifying the surface of polymer nanoparticles (NP) by novel biocompatible amphiphilic copolymers, composed of hydrophilic ethylene oxide (EO) units and hydrophobic ε-caprolactone (CL) units. Copolymers of different architectures have been considered, i. E. , diblock copolymers, graft copolymers and star-shaped copolymers. Poly(ethylene oxide) chains α-terminated by an ε-caprolactone group and ω-end-capped by a methoxy group (γPEO. CL) were synthesized and used, (i) as PEO macromonomers that were copolymerized by ring-opening polymerization (ROP) with ε-caprolactone (ε-CL) to give PCL-g-PEO graft copolymers, and (ii) as precursors for a AB-double headed PEO chain, that were used to initiate selectively the polymerization of two different monomers to form an ABC mikto-arm star copolymer. The amphiphilic PEO/PCL diblock and graft copolymers were used as stabilizers and surface modifiers of polymer nanoparticles (NP). The effect of the copolymer structural features (architecture, composition and amount) on the formation and structure of the NP was investigated. The complement activation, i. E. , the stealthiness of the nanoparticles, as a function of the composition and architecture of the copolymer used as a stabilizer was studied. Another challenge of this work was to decorate the surface of such NP by mannose moieties, which are suitable targeting probes for dendritic, mannose-receptor expressing cells. Therefore, mannose derivatives were covalently attached as α-end-group to poly(ε-caprolactone) and PEO-b-PCL diblock copolymers. It was found that the NPs' surface properties were strongly related to the glyco(co)polymers used for their preparation
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Balasubramaniam, Sharavanan. « Synthesis, Characterization and Structure-Property Relationships of Polymer-Stabilized Nanoparticles Containing Imaging and Therapeutic Agents ». Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/55119.

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The controllable design of magnetic nanocarriers is essential for advanced in vivo applications such as magnetic resonance image-guided therapeutic delivery and alternating magnetic field-induced remote release of drugs. This work describes the fabrication of polymer-stabilized nanoparticles encapsulating imaging and therapeutic agents and delineates relationships among materials parameters and response. The effect of aggregation of magnetic iron oxide nanoparticles in aqueous suspension was characterized using a well-defined core-corona complex comprised of a superparamagnetic magnetite nanoparticle stabilized by terminally-anchored poly(N-isopropylacrylamide) (PNIPAM) corona. The modified Vagberg density distribution model was employed to verify that the complexes were individually dispersed prior to aggregation and was found to accurately predict the intensity-weighted hydrodynamic diameter in water. Aggregation of the complexes was systematically induced by heating the suspension above the lower critical solution temperature (LCST) of the polymer, and substantial increase in the NMR transverse relaxation rates was noted. Controlled clusters of primary iron oxide nanoparticles stabilized by the biodegradable block copolymer, poly(ethylene oxide-b-D,L-lactide) were fabricated by a scalable, rapid precipitation technique using a multi-inlet vortex mixer. Quantitative control over iron oxide loading, up to 40 wt%, was achieved. Correlations between particle parameters and transverse relaxivities were studied within the framework of the analytical models of transverse relaxivity. The experimental relaxivities typically agreed to within 15% with the values predicted using the analytical models and cluster size distributions derived from cryo-transmission electron microscopy. Hydrophilic-core particles assembled using the poly(ethylene oxide-b-acrylate) copolymer and at similar primary nanoparticle sizes and loadings had considerably higher transverse (r2) and longitudinal (r1) relaxivities, with r2s approaching the theoretical limit for ~ 8 nm magnetite. Block copolymer nanoparticles comprised of poly(D,L-lactide) and poly(butylene oxide) cores were utilized to encapsulate the poorly water-soluble antiretroviral drug, ritonavir, at therapeutically-useful loadings. Controlled size distributions were achieved by incorporation of homopolymer additives, poly(L-lactide) or poly(butylene oxide) during the nanoparticle preparation process. Nanoparticles either co-encapsulating a highly hydrophobic polyester poly(oxy-2,2,4,4-tetramethyl-1,3-cyclobutanediyloxy-1,4-cyclohexanedicarbonyl) within the core or possessing crosslinkable groups around the core were also successfully fabricated for potential sustained release of ritonavir from block copolymer carriers.
Ph. D.
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Jiang, Xuwei. « Synthesis and properties of comb-like polylactides ». Diss., Connect to online resource - MSU authorized users, 2006.

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Prebe, Arnaud. « Different routes for synthesis of Poly(lactic acid) : silicon-based hybrid organic-inorganic nanomaterials and nanocomposites ». Lyon, INSA, 2010. http://theses.insa-lyon.fr/publication/2010ISAL0015/these.pdf.

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The general aim of this work was to study the different routes that can be taken in order to generate a polymer-nanocomposite taking into account the current knowledge in this scientific domain. Consequenlty, four routes were studied: The first route starts from the preformed inorganic phase, i. E. Fumed silica, and the polymer matrix, i. E. Poly(lactic acid) (PLA). The second route starts from the preformed inorganic filler and PLA monomer, i. E. L-Lactide, in order to in-situ polymerize the L-Lactide in the presence of the fumed silica. The third route starts from the preformed polymer matrix, i. E. PLA, and the use of alkoxysilane as precursors for in-situ generation of an inorganic-rich phase into the polymer. The fourth and last route combines the generation of the inorganic-rich phase and the polymerization of the organic monomer. The objectives of this work focused on the chemical paths and processes instead of the final properties of the resulting nanocomposites. Due to the very broad series of PLA-based nanocomposites which could be generated from the different routes, we choose to have a special attention on the chemistry(ies) involved. Finally, the different routes leading to various types of PLA-nanocomposites in terms of molar mass, crystallinity and morphology were reported. The key point for having a high better state of dispersion seems to depend on the process as we demonstrated that the extrusion step offers high shear enabling a good dispersion. Moreover, it was shown that compatibility between the PLA matrix and the inorganic phase can be tailored by the functionality of the nanofiller surface or the functional groups of an interfacial agent
L’acide polylactique génère depuis quelques années un engouement certain puisqu’il apparaît comme un des biopolymères les plus aptes à remplacer les polymères issus de l’industrie pétrolière. Toutefois, afin de pouvoir prétendre remplacer ces polymères dans les applications tel que l’emballage, etc. , les propriétés mécanique se doivent d’être au moins égale. Il est maintenant bien reconnu qu’il est possible d’accroitre une multitude de propriété en nanostructurant à l’aide d’une phase inorganique les polymères. Cependant il existe plusieurs possibilité quand au procédé choisi. Ici on se propose d’étudier la production d’un nanocomposite à base d’acide polylactique et d’une phase inorganique siliconée en utilisant différentes voies de production. En premier lieu, la synthèse in-situ du PLA en présence de silice pyrogénée a été étudiée tout en faisant varier la compatibilité par la fonctionnalisation en surface. Ensuite la génération de la phase inorganique à partir de précurseur alkoxysilane a été menée directement dans l’acide polylactique fondu par extrusion réactive avec l’ajout ou non d’agent d’interface. Puis les deux voies ont été combinées afin de générer la phase inorganique dans le monomère fondu (L-Lactide) puis de polymériser celui-ci dans le même réacteur. Enfin ces trois voies ont été comparées entre elles et avec le simple mélangeage dans le fondu de silice pyrogénée avec l’acide polylactique en extrusion
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Livres sur le sujet "Polylactide- Synthesis"

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Piemonte, Vincenzo. Polylactic acid : Synthesis, properties, and applications. Hauppauge, N.Y : Nova Science Publishers, 2011.

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Brzeziński, Marek, et Małgorzata Baśko, dir. Polylactide-Based Materials : Synthesis and Biomedical Applications. MDPI, 2023. http://dx.doi.org/10.3390/books978-3-0365-6641-2.

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Piemonte, Vincenzo. Polylactic Acid : Synthesis, Properties and Applications. Nova Science Publishers, Incorporated, 2014.

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Seifalian, Alexander, et Ali Nabipour Chakoli. Polylactic Acid Nanocomposites : Properties, Synthesis, Fabrication, and Applications. Elsevier, 2021.

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Chapitres de livres sur le sujet "Polylactide- Synthesis"

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Frediani, Marco, Werner Oberhauser, Elisa Passaglia, Luca Rosi, Damiano Bandelli, Mattia Bartoli et Giorgio Petrucci. « Pyridine and Bipyridine End-Functionalized Polylactide : Synthesis and Catalytic Applications ». Dans Handbook of Composites from Renewable Materials, 47–67. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2017. http://dx.doi.org/10.1002/9781119441632.ch65.

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Kaneko, Hideyuki, Junji Saito, Nobuo Kawahara, Shingo Matsuo, Tomoaki Matsugi et Norio Kashiwa. « Polypropylene-graft-poly(methyl methacrylate) Graft Copolymers : Synthesis and Compatibilization of Polypropylene/Polylactide ». Dans ACS Symposium Series, 357–71. Washington DC : American Chemical Society, 2009. http://dx.doi.org/10.1021/bk-2009-1023.ch024.

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Re, Giada Lo, Philippe Dubois et Jean-Marie Raquez. « In Situ Metal-Free Synthesis of Polylactide Enantiomers Grafted from Nanoclays of High Thermostability ». Dans ACS Symposium Series, 287–303. Washington, DC : American Chemical Society, 2015. http://dx.doi.org/10.1021/bk-2015-1192.ch018.

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Lotz, Bernard. « Crystal Polymorphism and Morphology of Polylactides ». Dans Synthesis, Structure and Properties of Poly(lactic acid), 273–302. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/12_2016_15.

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Ganguly, Sayan, et Poushali Das. « Synthesis and Production of Polylactic Acid (PLA) ». Dans Polylactic Acid-Based Nanocellulose and Cellulose Composites, 29–50. Boca Raton : CRC Press, 2022. http://dx.doi.org/10.1201/9781003160458-2.

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Lebudi, Collieus, Babatunde Abiodun Obadele, Oluseyi Philip Oladijo et Enoch Nifise Ogunmuyiwa. « Particulate-Reinforced Polylactic Composites : Synthesis, Properties, and Applications ». Dans Hybrid Polymeric Nanocomposites from Agricultural Waste, 175–91. Boca Raton : CRC Press, 2022. http://dx.doi.org/10.1201/9781003170549-11.

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Friedrich, K., J. Hoffmann, A. A. Almajid et M. Evstatiev. « Polylactide Based Bio-Resorbable Bone Nails : Improvements of Strength and Stiffness by Microfibrillar Reinforcement ». Dans Synthetic Polymer-Polymer Composites, 627–40. München : Carl Hanser Verlag GmbH & ; Co. KG, 2012. http://dx.doi.org/10.3139/9781569905258.018.

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Dutta, Saikat, Wen-Chou Hung, Bor-Hunn Huang et Chu-Chieh Lin. « Recent Developments in Metal-Catalyzed Ring-Opening Polymerization of Lactides and Glycolides : Preparation of Polylactides, Polyglycolide, and Poly(lactide-co-glycolide) ». Dans Synthetic Biodegradable Polymers, 219–83. Berlin, Heidelberg : Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/12_2011_156.

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Wang, James H., et David M. Schertz. « Synthesis of Grafted Polylactic Acid and Polyhydroxyalkanoate by a Green Reactive Extrusion Process ». Dans ACS Symposium Series, 439–53. Washington, DC : American Chemical Society, 2010. http://dx.doi.org/10.1021/bk-2010-1043.ch030.

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Kodera, Hiromi, Naoki Nishishita, Yoshiaki Hirano, Yoshiaki Kiso et Yoshio Hayashi. « Synthesis of Polylactides with Side Chain Functionality : Ring-Opening Polymerimerization of a Homobislactone Prepared from Lysine ». Dans Advances in Experimental Medicine and Biology, 243–44. New York, NY : Springer New York, 2009. http://dx.doi.org/10.1007/978-0-387-73657-0_111.

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Actes de conférences sur le sujet "Polylactide- Synthesis"

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Mhlanga, Nikiwe, et Suprakas Sinha Ray. « Synthesis and characterization of polylactide/doxorubicin/magnetic nanoparticles composites for drug delivery ». Dans PROCEEDINGS OF PPS-30 : The 30th International Conference of the Polymer Processing Society – Conference Papers. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4918443.

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Vukić, Nevena, Tamara Erceg, Vesna Teofilović, Ljubiša Nikolić, Suzana Cakić, Borislav Simendić et Ivan Ristić. « THE USE OF THE GREEN CHEMISTRY CONCEPT IN THE SYNTHESIS OF PACKAGING MATERIAL BASED ON POLYLACTIDE ». Dans 9th International Symposium on Graphic Engineering and Design. Faculty of Technical Sciences, 2018. http://dx.doi.org/10.24867/grid-2018-p35.

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Potnuru, Akshay, et Yonas Tadesse. « Synthesis and Characterization of Hybrid Actuator Based on Polypyrrole and SMA ». Dans ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-39125.

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This paper presents initial investigation on a hybrid artificial muscle actuator combining two actuation technologies, based on conductive polymers and shape memory alloys (SMAs). Polypyrrole is used as the conductive polymer muscle and nickel-titanium as shape memory alloy to make the composite muscle system. Depending on the geometry of the actuator, doped polypyrrole exhibits large strain, consuming less voltage and current; whereas shape memory alloy generates large stress (force), consuming high power (high current). Helically wound coil structure was chosen as the shape of the composite actuator in this study. The polypyrrole is synthesized on the surface of the Ni-Ti shape memory alloy wire, wound around a core gold coated polylactide fiber (PLA). Preliminary results on the performance and synthesis conditions of the composite actuator will be presented for various applications under different conditions.
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Kramschuster, Adam, Lih-Sheng Turng, Wan-Ju Li, Yiyan Peng et Jun Peng. « The Effect of Nano Hydroxyapatite Particles on Morphology and Mechanical Properties of Microcellular Injection Molded Polylactide/Hydroxyapatite Tissue Scaffold ». Dans ASME 2010 First Global Congress on NanoEngineering for Medicine and Biology. ASMEDC, 2010. http://dx.doi.org/10.1115/nemb2010-13290.

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The current large demands for transplant organs and tissues has led to extensive research on material synthesis and fabrication methods for biodegradable polymeric scaffolds, which are required to have high porosity, well interconnected pore structure, and good mechanical properties. However, the majority of current scaffold fabrication techniques are either for batch processes or use organic solvents, which can be detrimental to cell survival and tissue growth. The ability to mass produce solvent-free, highly porous, highly interconnected scaffolds with complex geometries is essential to provide off-the-shelf availability [1]. Injection molding has long been used for mass production of complex 3D plastic parts. The low-cost manufacturing, repeatability, and design flexibility inherent in the injection molding process make it an ideal manufacturing process to create 3D scaffolds, as long as high porosity and interconnectivity can be imparted into the finished product.
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Majka, Tomasz, et Agnieszka Świętoń. « The studies on the production of polylactide's paper adhesive ». Dans The 21st International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland : MDPI, 2017. http://dx.doi.org/10.3390/ecsoc-21-04737.

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Maimun, Maimun, Hesti Meilina et Cut Rosnelly. « Synthesis and Characterization of Polylactic Acid / Local Clay Nanocomposite for Packaging Applications ». Dans Proceeding of the First International Graduate Conference (IGC) On Innovation, Creativity, Digital, & Technopreneurship for Sustainable Development in Conjunction with The 6th Roundtable for Indonesian Entrepreneurship Educators 2018 Universitas Syiah Kuala October, 3-5, 2018 Banda Aceh, Indonesia. EAI, 2019. http://dx.doi.org/10.4108/eai.3-10-2018.2284354.

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Zhang, Qi, et Pierre Mertiny. « Effect of Graphene Nanoplatelet Addition on the Conductive Behavior of Solution Mixing Processed Polylactide Biopolymer Nanocomposites ». Dans ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-12053.

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Abstract The fabrication of highly thermally and electrically conductive polymer materials is of interest for multiple applications, for example, in electronics packaging and biosensors. Polylactic acid (PLA), a commercially available and biodegradable polyesters, is widely used and studied since it is considered a environmentally friendly alternative to petrochemical-based synthetic polymers. In the present study, graphene nanoplatelets (GNP) reinforced PLA composites were prepared via solution blending followed by a compression molding process. Various physical and thermo-mechanical analyses were performed with the prepared composites. For instance, the electrical conductivity of PLA/GNP composites at various filler loadings was determined using four-point probe resistivity measurements. An electrical conductivity of 0.1 S/cm was achieved at a GNP loading of 12 wt%. Using the hot-disk transient plane source method, anisotropic thermal conductivity properties were evaluated. An in-plane and through-plane thermal conductivity of 0.87 W/mK and 0.58 W/mK was achieved with the addition of 6 wt% GNP, which is a nearly twofold and over fourfold increase compared to neat PLA, respectively.
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Rahmayetty, Sukirno, Bambang Prasetya et Misri Gozan. « Synthesis and characterization of L-lactide and polylactic acid (PLA) from L-lactic acid for biomedical applications ». Dans BIOMEDICAL ENGINEERING’S RECENT PROGRESS IN BIOMATERIALS, DRUGS DEVELOPMENT, AND MEDICAL DEVICES : Proceedings of the First International Symposium of Biomedical Engineering (ISBE 2016). Author(s), 2017. http://dx.doi.org/10.1063/1.4976761.

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Mahat, Mohamad Mazwan, Izatul Aina Afiqah Mohd Rohazid, Farah Nabillah Kazwa et Nurul Nadiah Kamaldin. « Biofluid Characterisation Using Pin on Disc Experiment from Plant Based Oil ». Dans International Conference on Nanoscience and Nanotechnology 2022. Switzerland : Trans Tech Publications Ltd, 2023. http://dx.doi.org/10.4028/p-7qk4tg.

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This study focuses on the performance and mechanical characteristics response of pure Canola oil and Canola oil with existence of Hyaluronic Acid. Numerous studies show that plant-based substances are infrequently used in synthetic synovial fluid. The sort of bio-fluid that derives from plant-based oil and can function as a synthetic synovial fluid is the focus of this work. Three samples of a bio-fluid made of Canola oil with three different concentrations of Hyaluronic Acid (HA) are 0 ml, 5 ml, and 10ml, respectively. The 500 mm x 500 mm x 4 mm Polylactic Acid (PLA) biomaterial disc was chosen in the pin on disc wear and friction test rig experiment in conjunction with a canola-based oil tested lubricant to simulate the mechanical principles on the knee. To obtain accurate findings for the wear rate and friction coefficient, the samples will be put through a tribology test. The experiment was conducted to measure the tribology of the stainless pin to observe the effect of coefficient of friction and wear rate on the pin. The reliable outcome may open up new avenues for future research on synthetic synovial fluid. On the other hand, this study is beneficial to medical technology for future treatment of any diseases related to synovial fluid and allows the manufacturer to improve understanding in the optimization of these lubricants in ensuring a long-term application in the human body.
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Ji, Yali, Isaac Rodriguez et Gary L. Bowlin. « Electrospinning of Chitin Whisker-Reinforced Nanocomposite Fibrous Scaffolds ». Dans ASME 2012 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/sbc2012-80104.

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Chitin is the second most abundant biopolymer next to cellulose and possesses many favorable properties such as non-toxicity, high crystallinity, biocompatibility and biodegradability. Acid-treatment of chitin can dissolve regions of low lateral order, resulting in elongated rod-like nanocrystals, termed “whiskers”. Chitin whiskers (CWs) are an emerging and novel nanofiller that have been shown to bring about reinforcing effects on both synthetic and natural polymeric structures. The biocompatibility and biodegradability also make it one of the most promising fillers.1 However; it was thought that CWs can only well disperse in aqueous solution, and poorly disperse in organic solvents, which to some extent restricts the development of CW-based nanocomposites. In a previous study, we found that the CW can be well dispersed in 1,1,1-trifluoroethanol (TFE) solvent which is a good solvent for commonly used biodegradable polymers such as polycaprolactone (PCL), polylactide (PLA) and polydioxanone (PDO). Thus, it is possible to blend CWs with these biopolymers to prepare nanocomposite scaffolds. Electrospinning is a rather simple and promising technique to fabricate scaffolds, since the resulting microstructures are similar to the extracellular matrix (ECM) with potential facilitate the design of surgical implants and promote tissue regeneration. Thus, the focus of this work was to develop CW-reinforced nanocomposite fiber scaffolds via electrospinning and investigate their mechanical and biological properties, expecting them to be potential candidates for bone tissue engineering applications.
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