拉伸成膜工艺诱导聚乳酸结晶行为的研究进展  

Research Progress on the Crystallization Behavior of Polylactic Acid Film Induced by Stretching Process

作　　者：丁诗娟 崔玲娜 刘跃军[1] DING Shijuan;CUI Lingna;LIU Yuejun(College of Packaging and Materials Engineering,Hunan University of Technology,Zhuzhou 412007,Hunan,China)

机构地区：[1]湖南工业大学包装与材料工程学院,湖南株洲412007

出　　处：《材料导报》2024年第18期262-270,共9页Materials Reports

基　　金：国家自然科学基金(12372245);湖南省教育厅科研项目(22B0595)。

摘　　要：聚乳酸(Polylactic acid,PLA)具有良好的生物可降解性、生物相容性以及一定的力学强度,是当前包装材料应用研究的热点之一。然而,PLA脆性大、耐热性差等问题限制了其应用范围的拓展。拉伸成膜工艺是一种温度场、拉伸场等多场耦合的塑料薄膜成型工艺,在拉伸成膜过程中,调节拉伸温度、拉伸比、拉伸速率等工艺参数,可改变PLA分子的结晶、取向等凝聚态结构以及拉伸诱导结晶程度,最终改善PLA薄膜的性能。本文综述了拉伸成膜工艺参数(拉伸温度、拉伸比、拉伸速率等)分别对PLA拉伸诱导结晶行为的影响,以期为实现PLA薄膜的高性能化以及拓展其应用范围提供一定的理论指导。Polylactic acid(PLA)has garnered significant research interest as a sustainable packaging material due to its excellent biodegradability,biocompatibility,and tensile strength.However,its application is constrained by inherent brittleness and poor heat resistance.The stretching process,a film-forming technique characterized by the coupling of temperature and strain fields,offers a promising approach to overcoming these limitations.By adjusting process parameters such as stretching temperature,stretching ratio,and stretching rate during the process,the crystallization,molecular orientation,and other condensed structures of PLA can be modified,as well as the degree of strain-induced crystallization,thereby enhancing the overall performance of PLA films.This paper reviews the effect of parameters(including stretching temperature,stretching ratio,and stretching rate)on the strain-induced crystallization behavior during the stretching process.The goal is to provide theoretical insights that can guide the development of high-performance PLA films and broaden their application potential.

关 键 词：聚乳酸(PLA) 拉伸薄膜 拉伸诱导结晶 凝聚态结构 拉伸比 

分 类 号：TQ32[化学工程—合成树脂塑料工业]