Structural Evolution of PGA Nascent Fiber during Single Low-Temperature and Segmented High-Temperature Hot Stretching

作     者：Yu-Shuang Miao Hua-Shuai Cui Jin Guo Jin-Tang Zhu Yi-Guo Li Zong-Bao Wang Yu-Shuang Miao;Hua-Shuai Cui;Jin Guo;Jin-Tang Zhu;Yi-Guo Li;Zong-Bao Wang

作者机构：School of Materials Science and Chemical EngineeringKey Laboratory of Impact and Safety EngineeringMinistry of EducationNingbo UniversityNingbo315211China State Key Laboratory of Biobased Fiber Manufacturing TechnologyChina Textile AcademyBeijing100025China 

出 版 物：《Chinese Journal of Polymer Science》 (高分子科学（英文版）)

年 卷 期：2023年第41卷第7期

页      面：1078-1092页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：financially supported by the National Natural Science Foundation of China (Nos. 51973097 and 52173021) the Open Fund of State Key Laboratory of Biobased Fiber Manufacturing Technology (No. SKL202207) 

主　　题：PGA fiber Structural evolution Hot stretching 

摘      要：Polyglycolide (PGA) fibers applied as surgical sutures strongly depend on their microstructure. The structural evolution of PGA nascent fibers during single low-temperature stretching and segmented high-temperature stretching was analyzed based on a combination of in situ WAXD/SAXS and DSC measurements. The results indicated that the hot stretching was conducive to the crystal perfection and the local fragmentation and recrystallization of the lamellar crystals may occur under stress induction. The single low-temperature stretching of PGA nascent fibers could be divided into three stages: the stretching of amorphous regions, stretch-induced crystallization and the stretching of crystalline regions. The elongation at break of the fibers can be substantially increased by adopting a segmented stretching method, and the high-temperature stretching can also significantly increase the crystallinity and orientation. The amorphous orientation peak appearing in the low-temperature stretching was gradually converted to crystallization peak during the heating process, which greatly improved the crystallinity and orientation of the fibers. High-temperature stretching compared with low-temperature stretching was more favorable for crystal perfection and structural evolution, where lamellar crystals underwent stress-induced fragmentation recrystallization to transform to fibrous crystals as the strain increased.