The role of crystalline, mobile amorphous and rigid amorphous fractions in the performance of recycled poly (ethylene terephthalate) (PET). Polymer Degradation and Stability,97 (1) 98-107, 2012
A. Ribes-Greus (2012). The role of crystalline, mobile amorphous and rigid amorphous fractions in the performance of recycled poly (ethylene terephthalate) (PET). Polymer Degradation and Stability. 97(1): 98-107. doi:10.1016/j.polymdegradstab.2011.10.008 J.D. Badia, E. Strömberg, S. Karlsson, A. Ribes-Greus, The role of crystalline, mobile amorphous and rigid amorphous fractions in the performance of recycled poly (ethylene terephthalate) (PET
AbstractThe action of thermo-mechanical degradation induced by mechanical recycling on poly (ethylene -2 -
The performance of biocompositesof polyhydroxybutyrate-co-valerate (PHBV) and sisal fibre subjected to hydrothermal tests at different temperatures above the glass transition of PHBV (TH= 26, 36 and 46 ºC) was evaluated in this study. The influences of both the fibre content and presence of coupling agent were focused. The water absorption capability and water diffusion rate were considered for a statistical factorial analysis. Afterwards, the physico-chemical properties of water-saturated biocomposites was assessed by Fourier-Transform Infrared Analysis, Size-Exclusion Chromatography, Differential Scanning Calorimetry and Scanning Electron Microscopy. It was found that the diffusion rate increased withboth temperature and percentage of fibre, whereas the amount of absorbed water was only influenced by fibre content. The use of coupling agent was only relevant at the initial stages of the hydrothermal test, giving an increase in the diffusion rate. Although the chemical structure and thermal properties of water-saturated biocomposites remained practically inherent to hydrolytical degradation, the physical performance was considerably affected, due to the swelling of fibres, which internally blow-up the PHBV matrix, provoking cracks and fibre detachment.
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