中国塑料 ›› 2016, Vol. 30 ›› Issue (06): 74-78 .DOI: 10.19491/j.issn.1001-9278.2016.06.015

• 加工与应用 • 上一篇    下一篇

剪切应力对聚乳酸结晶性能的影响

初立秋1,张丽英2,刘建叶3,张浩3,张师军4   

  1. 1. 中国石油化工股份有限公司北京化工研究院2. 中石化北京化工研究院3. 中国石化北京化工研究院4. 北京化工研究院
  • 收稿日期:2016-01-19 修回日期:2016-03-12 出版日期:2016-06-26 发布日期:2016-06-26

Effects of Shear Stress on Crystallization Behavior of Polylactide

  • Received:2016-01-19 Revised:2016-03-12 Online:2016-06-26 Published:2016-06-26

摘要: 通过改变升降温循环次数、热历史消除时间及温度,研究了剪切作用力对聚乳酸树脂原料及流延片结晶行为的影响规律。结果表明,聚乳酸的结晶行为受其分子的缠结状态或相对有序程度的影响,在剪切作用力的影响下,聚乳酸分子解缠结或者相对有序程度提高,因此更容易出现冷结晶过程。

关键词: 聚乳酸, 热历史, 剪切应力, 结晶

Abstract: The influences of shearing stress on crystallization behavior of polylactide (PLA) resin and casting sheet were investigated by changing heating and cooling circle times, aging time and temperature. It showed that the entanglement or the extent of relative order of PLA molecules affected the crystallization behavior. Under the influence of shearing stress, the disentanglement of PLA molecules happened or the extent of relative order increased, which made the cold crystallization process occur easier.

Key words: polylactide, thermal history, shear stress, crystallization