Influence of crystallinity on the biodegradation rate of injection-moulded poly(lactic acid) samples in controlled composting conditions

Pantani, Roberto; Sorrentino, Andrea

doi:10.1016/j.polymdegradstab.2013.01.005

Cited by 233 publications

(119 citation statements)

References 24 publications

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“…In the case of PLA, a crystallinity of 30% did not affect the initial degradation behaviour, but did alter the water uptake and swelling during the later stages of degradation [35]. In the case of PLGA material, crystallinity can increase the degradation rate [34]; however, the effect of crystallinity on the rate of degradation for the PLGA materials considered here was not significant as the solvent-cast and the compression-moulded PLGA materials remain amorphous during degradation.…”

Section: Effect Of Processing Methodsmentioning

confidence: 81%

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Effects of material thickness and processing method on poly(lactic-co-glycolic acid) degradation and mechanical performance

Shirazi

Aldabbagh

Ronan

et al. 2016

J Mater Sci: Mater Med

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(2016). Effects of material thickness and processing method on poly(lactic-co-glycolic acid) degradation and mechanical performance. Journal of Materials Science: Materials in Medicine, 27(10), 1-12. doi: 10.1007/s10856-016-5760-z PublisherSpringer Verlag The specific material processing methods considered here did not have a significant effect on the degradation rate and the changes in mechanical properties during degradation; however, they influenced the initial molecular weight and they determined the stiffness and hardness of the PLGA material. The experimental observations strongly supported the computational modelling predictions that showed no significant difference in the degradation rate and the changes in the elastic modulus of PLGA films for thicknesses larger than 100 μm.

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Section: Effect Of Processing Methodsmentioning

confidence: 81%

“…It has been shown that any crystallinity present may have an effect on the degradation behaviour [34,35]. In the case of PLA, a crystallinity of 30% did not affect the initial degradation behaviour, but did alter the water uptake and swelling during the later stages of degradation [35].…”

Section: Effect Of Processing Methodsmentioning

confidence: 99%

Effects of material thickness and processing method on poly(lactic-co-glycolic acid) degradation and mechanical performance

Shirazi

Aldabbagh

Ronan

et al. 2016

J Mater Sci: Mater Med

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“…Para os sistemas preparados pela técnica de intercalação por fusão, contendo argila sem modificação, poucas mudanças aconteceram na estrutura interlamelar da argila, indicando aspecto de um microcompósito. Já para os sistemas a base de argila organofílica, aparentemente ocorreu uma maior intercalação do polímero entre as lamelas da argila, uma vez os picos da argila foram deslocados para ângulos menores e consequentemente, aumentando a distância interplanar basal, indicando a formação de prováveis estruturas intercaladas com tendência à esfoliação [17][18][19].…”

Section: Difração De Raios-x (Drx): Intercalação Por Fusão E Intercalunclassified

Influência da argila vermiculita brasileira na biodegradação de filmes de PHB

et al. 2015

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ResumoEste trabalho teve como objetivo preparar e avaliar filmes PHB/vermiculita natural e modificada nas quantidades em peso de 1%, 3% e 6% através dos métodos intercalação por fusão e intercalação por solução. Os bionanocompósitos obtidos pelo método intercalação por fusão foram preparados em uma extrusora monorosca e posteriormente os filmes foram moldados via compressão. Na preparação dos filmes por solução, os sistemas foram submetidos à agitação e aquecimento a 80 °C. Os sistemas foram avaliados por difração de raios-X e o comportamento de biodegradação foi avaliado de acordo com a norma ASTM G 160-03. O acompanhamento da biodegradação foi realizado por meio de inspeção visual e perda de massa. Observou-se que o percentual de argila e o método de obtenção dos filmes influenciaram na estrutura formada e na biodegradação dos sistemas. Palavras-chave: polímeros biodegradáveis, argila vermiculita, ensaio de biodegradação, bionanocompósitos. AbstractThis study aimed to prepare and to evaluate natural and modified PHB /vermiculite films in quantities of 1%, 3% and 6% by weight, through melt intercalation and solution intercalation methods. The bionanocomposites in the form of thin films, obtained by the melt intercalation method, were prepared in a single screw extruder and then molded via compression. In the preparation of the films by solution method, the systems were stirred and heated at 80 °C in the presence of the chloroform solvent. The systems were evaluated by X-ray diffraction and the degradation behavior was evaluated according to ASTM G 160-03, by visual inspection and through weight loss. It was observed that the percentage of clay and the method of obtaining of the films influenced in the structure and biodegradability of the systems.

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“…This is particularly true for Poly(LacticAcid) (PLA), which is a promising candidate to replace durable polymers in many applications. In fact, the biodegradation of PLA is considered to consist of a sequential mechanism in which the first step is hydrolysis, which reduces the molecular weight, and the second step is assimilation by the microorganisms [1,2]. In this context, it is of fundamental importance to have knowledge of transport properties and the correlation, either with the chain microstructure or the morphology of manufacture, the contact with water being unavoidable for objects made of PLA during and after their use.…”

Section: Introductionmentioning

confidence: 99%