期刊
POLYMER TESTING
卷 47, 期 -, 页码 1-3出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymertesting.2015.07.011
关键词
Polylactic acid; Thermoplastic polyurethane; Biodegradability; Morphology
资金
- United States Department of Agriculture [USDA-CSREES 2010-38924-20706]
Blends with varied ratio of polylactic acid (PLA) and thermoplastic polyurethane (TPU) were prepared by melt blending. The PIA content in blends was 20, 40, 60 and 80 wt%. Samples of pure PIA and TPU that underwent the same thermal treatment were also prepared. Biodegradation was examined by respirometry. Pure TPU started to degrade immediately due to degradation of the low molecular weight plasticizer in the polymer. Pure PTA, on the other hand, exhibited an incubation period after which degradation progressed rapidly and was almost complete after 70 days. The degradation profile of the blends can be correlated to their morphology. Samples with a co-continuous morphology initially degrade at a higher rate than the rest of the samples due to the higher exposure of the TPU phase in these blends. (C) 2015 Elsevier Ltd. All rights reserved.
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