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Effect of cooling conditions on the mechanical properties of crystalline poly(lactic acid)

机译:冷却条件对晶体聚(乳酸)力学性能的影响

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Appropriate cooling conditions in melt processing were found to provide crystalline poly(lactic acid) (PLA) with greater mechanical toughness in tensile tests. PLA films cooled near its glass transition temperature T-g showed ductile behavior, whereas those obtained by a quenching process exhibited brittle fracture. The content of gauche-gauche (gg) conformer, which leads to low critical onset stress for shear yielding, increased in the films cooled near T-g. The crystallinity of the films hardly affected their mechanical toughness and proportion of gg conformer except for that with a high degree of crystallinity (> 50%). (C) 2017 Wiley Periodicals, Inc.
机译:发现熔融加工中的适当冷却条件提供晶体聚(乳酸)(PLA),其在拉伸试验中具有更大的机械韧性。 PLA薄膜在其玻璃化转变温度T-G附近冷却,显示延展性行为,而通过淬火过程获得的薄膜表现出脆性骨折。 Gauche-Gauche(GG)塑造剂的含量导致剪切屈服低临界发作应力,在T-G附近冷却的薄膜中增加。 除了具有高度结晶度(> 50%)之外,薄膜的结晶度几乎影响了它们的机械韧性和GG符合特的比例。 (c)2017 Wiley期刊,Inc。

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