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首页> 外文期刊>Journal of Applied Polymer Science >Loss of thermoplastic elastomer toughening in polylactide after weathering
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Loss of thermoplastic elastomer toughening in polylactide after weathering

机译：耐候后聚乳糖剂中热塑性弹性体增韧的丧失

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摘要

It has been already pointed out that one of the best ways to increase toughness of the inherently brittle polylactide (PLA) without sacrificing strength and modulus is the use of thermoplastic elastomer toughening approach; but what happens under outdoor conditions was not explored. Therefore, the objective of this study was to explore the degree of losses especially in fracture toughness of PLA when blended with thermoplastic polyurethane (TPU) elastomer or thermoplastic polyester elastomer (TPE) after weathering. For this purpose, neat PLA, its 10 phr TPU and TPE blends were exposed to accelerated weathering conditions of both ultraviolet-irradiation cycles and moisture cycles as described in the standard of ISO 4892-3 for various periods. In general, due to the significant molecular weight reduction via chain scission reactions, drastic losses in the strength and toughness of the specimens were observed. On the other hand, in terms of %retention in the properties after weathering periods, it could be suggested that, rather than use of neat PLA, the use of its TPU or TPE blends would be still advantageous for both "indoor use" and also for "outdoor use." (c) 2018 Wiley Periodicals, Inc.
机译：它已经被指出的增加固有脆性的聚乳酸（PLA）的韧性而不牺牲强度和模量的最佳方法之一是使用热塑性弹性体增韧方法;但什么样的户外条件下发生并没有探讨。因此，本研究的目的是当与热塑性聚氨酯（TPU）共混，以探索的特别是在PLA的断裂韧性的损失程度的弹性体或风化后热塑性聚酯弹性体（TPE）。为了这个目的，整齐PLA，其10phr的TPU和TPE的共混物暴露于如在ISO 4892-3标准对各个时期描述紫外线辐照周期和湿气循环两者的加速风化条件。一般情况下，由于经由断链反应的显著分子量降低，观察到的强度和样品的韧性急剧损失。在另一方面，在风化周期后的性质％保留的条款，也可能是建议，而不是用整齐的解放军，利用其TPU或TPE共混物将是既“室内使用”仍然是有利的，也对于“户外使用。” （c）2018 Wiley期刊，Inc。

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