Improvement of thermal stability, rheological and mechanical properties of PLA, PBAT and their blends by reactive extrusion with functionalized epoxy

Al-Itry, Racha; Lamnawar, Khalid; Maazouz, Abderrahim

doi:10.1016/j.polymdegradstab.2012.06.028

Cited by 695 publications

(662 citation statements)

References 58 publications

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“…The results showed that the tensile strength and impact strength of PLA decreased slightly after the multi-extrusion process, whereas the melt flow index and permeability of water vapor and oxygen were increased by the multiextrusion cycles. Al-Itry et al [48] examined the thermal stability of PLA processed by the extrusion process at different processing temperatures by analyzing the rheological properties of the extruded PLA. Figure 9 shows the effect of the processing temperature on the viscosity of the extruded polymer at different temperatures along with the related molecular weights.…”

Section: Thermal Propertiesmentioning

confidence: 99%

“…The viscosity of the extrudate decreased with increasing extrusion temperature because of the decreasing molecular weights associated with the shear deformation imposed by the extrusion screw. To enhance the thermal stability of PLA during the extrusion process, chain extenders [48] were incorporated with the polymer, which resulted in an increased complex viscosity of the extruded polymer. Recently, the effects of PS, as a second component, on the thermal degradation of PLA polymer was studied [49].…”

Section: Thermal Propertiesmentioning

confidence: 99%

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Properties and medical applications of polylactic acid: A review

Hamad¹,

Kaseem²,

Yang

et al. 2015

Express Polym. Lett.

573

306

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Abstract. Polylactic acid (PLA), one of the well-known biodegradable polyesters, has been studied extensively for tissue engineering and drug delivery systems, and it was also used widely in human medicine. A new method to synthesize PLA (ring-opening polymerization), which allowed the economical production of a high molecular weight PLA polymer, broadened its applications, and this processing would be a potential substitute for petroleum-based products. This review described the principles of the polymerization reactions of PLA and, then, outlined the various materials properties affecting the performance of PLA polymer, such as rheological, mechanical, thermal, and barrier properties as well as the processing technologies which were used to fabricate products based on PLA. In addition, the biodegradation processes of products which were shaped from PLA were discussed and reviewed. The potential applications of PLA in the medical fields, such as tissue engineering, wound management, drugs delivery, and orthopedic devices, were also highlighted.

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Section: Thermal Propertiesmentioning

confidence: 99%

Section: Thermal Propertiesmentioning

confidence: 99%

Properties and medical applications of polylactic acid: A review

Hamad¹,

Kaseem²,

Yang

et al. 2015

Express Polym. Lett.

573

306

View full text Add to dashboard Cite

show abstract

“…5b), while hydrolysis reaction takes place by water-based degradation as presented in Fig. 5c [52,[120][121][122]. Several variables affect the rate of no-enzymatic degradation such as crystallinity, morphology of the polymer, water concentration, temperature, presence of fillers and etc.…”

Section: Degradationmentioning

confidence: 99%

“…Afterwards, the presence of nanoparticles does not significantly affect the degradation trend of the polymer. Other authors [120,123] reported that the hydrolysis occurs more effectively at a temperature between 1508C and 2158C.…”

Section: Degradationmentioning

confidence: 99%

An overview on properties and applications of poly(butylene adipate‐co‐terephthalate)–PBAT based composites

Ferreira

Cividanes

Gouveia

et al. 2017

Polymer Engineering & Sci

314

149

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There is growing interest in biodegradable polymers (BP), in particular poly(butylene adipate‐co‐terephthalate) (PBAT), due to environmental problems associated with the disposal of non‐biodegradable polymers into the environment. However, high production cost and low thermo‐mechanical properties restrict the use of this sustainable material, making its biodegradability advantageous only when it is decisively required. The addition of different compositions of monomers and selective addition of natural fillers have been reported as alternatives to develop more accessible PBAT‐based bioplastics with performance that could match or even exceed that of the most widely used commodity plastics. This review explores the recent progress of the applications and biodegradation of PBAT. The addition of natural fillers and its effect on the final performance of the PBAT‐based composites is also reported with respect to improving the properties of composites. The advance of polymerization reaction engineering combined with sustainable trend offers great opportunities for innovative green chemical manufacturing. POLYM. ENG. SCI., 59:E7–E15, 2019. © 2017 Society of Plastics Engineers

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“…Assim, muitos estudos têm se dedicado à modificação dos biopolímeros na viabilização do processamento e utilização dos mesmos em diversas aplicações. [49] Para isso, foram desenvolvidas blendas poliméricas [50] , compósitos poliméricos [51,52] e nanocompósitos poliméricos [53,54] , que apresentam melhorias nas propriedades de processabilidade, resistência térmica, propriedades mecânicas, propriedades reológicas, permeabilidade a gases e taxa de degradação.…”

Section: Biopolímeros E Polímeros Biodegradáveisunclassified

Obtenção e caracterização de PLA reforçado com nanocelulose.

Correia¹

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AGRADECIMENTOSAos meus pais, simplesmente por tudo! Pelo amor incondicional, carinho, dedicação e por terem me apoiado em todas minhas decisões. Ao meu irmão Augusto e meu namorado Bruno pelo companheirismo, toda compreensão e força nos momentos difíceis. Sem vocês nada disso faria sentido! Amo muito vocês! À Prof.ª Dra. Ticiane Sanches Valera pela orientação, atenção e apoio ao longo de todo este trabalho. Obrigada por ter me acolhido, por me apresentar este tema com o qual adorei trabalhar e, acima de tudo, obrigada pelo exemplo e pelos conhecimentos compartilhados! Ao meu coorientador Prof. Dr. Marcio Yee, Universidade Federal de São Paulo (UNIFESP), pela disponibilidade, mesmo trabalhando em outra cidade! Obrigada por ter me apresentado à Prof.ª Ticiane, pela paciência, compreensão e o enorme suporte que me proporcionou! Sem você tudo seria muito mais difícil!! Aos meus queridos amigos e colegas do Laboratório de Polímeros! Obrigada a todos por me ajudarem a fazer tudo isso dar certo! Obrigada a Fernanda, Nati e Kleber pelas conversas, pelas risadas, pelos chocolates (Kleber, nem um caminhão da Lacta poderia pagar por eles...), enfim, obrigada pela amizade única!! Às alunas mais novas Anita e Suellen. Su, obrigada por toda a ajuda no trabalho, espero que continuemos firmes e fortes para prosseguir com os trabalhos futuros! Obrigada Camila pela enorme ajuda em tudo que parecia que não ia dar certo, sua experiência no Laboratório é única e fez (e ainda faz) a diferença, muito Obrigada Palavras-chave: celulose, nanopartículas, biopolímeros, nanocompósitos, reologia. ABSTRACTCellulose is the renewable natural polymer currently available in greatest abundance. Cellulose is a semicrystalline polymer, and it is possible to extract its crystalline domains through a procedure that destroys its amorphous phase, such as acid etching, so obtaining crystalline cellulose particles called cellulose nanoparticles (NC). These nanoparticles have attracted great scientific interest because they have mechanical properties similar to those of many inorganic types of filler used in polymer matrix composites, like elastic modulus and tensile strength. Moreover, they have nanometric dimensions, which contribute to lower filler contents in the polymer matrix, due to its increased surface area when compared to the one of micrometric fillers. Nanocomposites formed by adding these fillers into polymeric matrices can present attractive commercial properties such as gas barrier, improved thermal properties, and low density, when compared to traditional composites. As NC are nanometric scale fillers, obtained from renewable sources, there is a great interest in their application into biodegradable biopolymer matrixes. Poly (lactic acid), PLA, is an example of biopolymer that presents improved thermal, mechanical and processing properties, when compared to the ones of other commercial biopolymers. In this work, cellulose nanoparticles (NC) were obtained, via acid hydrolysis, using three different methods, in order to study the most efficie...

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Improvement of thermal stability, rheological and mechanical properties of PLA, PBAT and their blends by reactive extrusion with functionalized epoxy

Cited by 695 publications

References 58 publications

Properties and medical applications of polylactic acid: A review

Properties and medical applications of polylactic acid: A review

An overview on properties and applications of poly(butylene adipate‐co‐terephthalate)–PBAT based composites

Obtenção e caracterização de PLA reforçado com nanocelulose.

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