聚乳酸成型加工过程中的熔体粘弹特性和结晶行为调控

发布时间：2018-03-29 15:50

  本文选题：聚乳酸　切入点：熔体粘弹特性　出处：《高分子通报》2017年10期

【摘要】：聚乳酸(PLA)是目前合成生物可降解高分子材料中应用量最大的品种,可望逐渐部分取代聚烯烃而更广泛应用于各个领域。但PLA树脂结构决定的松弛特性导致其加工过程特殊的黏弹特性,使其熔体强度低、成型工艺特性不稳定并进而导致产品尺寸和性能不稳定。此外,PLA极低的结晶速率,使其在挤出和注射成型等较高冷却速率的实际加工条件下呈无定型态,进一步影响了其加工和使用性能。这些问题已成为PLA更大规模商品化应用的瓶颈。本文从通过调控PLA熔体加工过程的黏弹特性而提高其可加工性出发,综述近年来本课题组在PLA成型加工过程中熔体粘弹特性和结晶行为(结晶速率和结晶结构)调控方面的研究进展。
[Abstract]:Polylactic acid (PLA) is one of the most widely used synthetic biodegradable polymer materials. It is expected that polyolefin will be gradually replaced by polyolefin to be more widely used in various fields. However, the relaxation characteristics of PLA resin due to its structure result in its special viscoelastic properties during processing, resulting in its low melt strength. In addition, the extremely low crystallization rate of PLA makes it amorphous under the conditions of higher cooling rate such as extrusion and injection molding. These problems have become the bottleneck of the larger commercial application of PLA. In this paper, by regulating the viscoelastic properties of PLA melt processing process, the machinability of PLA melt processing process is improved. The recent progress in the study of viscoelastic properties and crystallization behavior (crystallization rate and crystal structure) of melt during PLA molding was reviewed.
【作者单位】： 四川大学高分子科学与工程学院高分子材料工程国家重点实验室;
【基金】：国家自然科学基金(21374065,51422305,51503132)
【分类号】：O633.14
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本文编号：1681808