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- Title
Effects of Irradiation Crosslinked on Degradation Performance of PLA Matrix Composites.
- Authors
XIA Xue-lian; SHI Xiang-yang; ZHAO Hai-peng; ZHOU Peng-fei; HOU Shu-xia; MAO Yan-li; CHEN Xing-hua
- Abstract
The strength and toughness of polylactic acid can be improved by plant fiber composite modification and γ-ray irradiation crosslinking. However, the effect of γ-irradiation crosslinking modification on the degradation performance of composites is not clear. The surface morphology, weight loss rate, crystallization behavior and mechanical properties of uncrosslinked samples and cross-linked samples before and after degradation were compared by scanning electron microscopy (SEM) test, weighing mass, differential scanning calorimetry (DSC) test and mechanical properties test. The results show that the uncrosslinked samples have more holes and grooves, rougher surface and more serious degradation than the cross-linked samples. The weight loss rate of uncrosslinked samples is higher than that of crosslinked samples. After 100 d of degradation, the glass transition temperature (Tg) of crosslinked and uncrosslinked samples are 52.8 °C and 47.51 °C, melting temperature (Tm) are 149.29 °C and 148. 1 °C, and crystallinity are 23.0% and 54.0%, respectively. The chain break caused by degradation of uncrosslinked samples is more serious. After 40 d of degradation, the tensile, impact, bending strength and elongation at break of the crosslinked samples are higher than those of the uncrosslinked samples, and the crosslinking delayes the degradation process to a certain extent.
- Subjects
GLASS transition temperature; POLYLACTIC acid; PLANT fibers; DIFFERENTIAL scanning calorimetry; IRRADIATION; BENDING strength
- Publication
Plastics Science & Technology / Suliao Ke-Ji, 2023, Vol 51, Issue 7, p62
- ISSN
1005-3360
- Publication type
Article
- DOI
10.15925/j.cnki.issn1005-3360.2023.07.013