Structural Evolution of PGA Nascent Fiber during Single Low-Temperature and Segmented High-Temperature Hot Stretching
RESEARCH ARTICLE|Updated:2023-06-14
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Structural Evolution of PGA Nascent Fiber during Single Low-Temperature and Segmented High-Temperature Hot Stretching
Chinese Journal of Polymer ScienceVol. 41, Issue 7, Pages: 1078-1092(2023)
Affiliations:
a.School of Materials Science and Chemical Engineering, Key Laboratory of Impact and Safety Engineering, Ministry of Education, Ningbo University, Ningbo 315211, China
b.State Key Laboratory of Biobased Fiber Manufacturing Technology, China Textile Academy, Beijing 100025, China
Miao, Y. S.; Cui, H. S.; Guo, J.; Zhu, J. T.; Li, Y. G.; Wang, Z. B. Structural evolution of PGA nascent fiber during single low-temperature and segmented high-temperature hot stretching. Chinese J. Polym. Sci. 2023, 41, 1078–1092
Yu-Shuang Miao, Hua-Shuai Cui, Jin Guo, et al. Structural Evolution of PGA Nascent Fiber during Single Low-Temperature and Segmented High-Temperature Hot Stretching[J]. Chinese Journal of Polymer Science, 2023, 41(7): 1078-1092.
Miao, Y. S.; Cui, H. S.; Guo, J.; Zhu, J. T.; Li, Y. G.; Wang, Z. B. Structural evolution of PGA nascent fiber during single low-temperature and segmented high-temperature hot stretching. Chinese J. Polym. Sci. 2023, 41, 1078–1092DOI: 10.1007/s10118-023-2892-8.
Yu-Shuang Miao, Hua-Shuai Cui, Jin Guo, et al. Structural Evolution of PGA Nascent Fiber during Single Low-Temperature and Segmented High-Temperature Hot Stretching[J]. Chinese Journal of Polymer Science, 2023, 41(7): 1078-1092.DOI: 10.1007/s10118-023-2892-8.
Structural Evolution of PGA Nascent Fiber during Single Low-Temperature and Segmented High-Temperature Hot Stretching
Hot stretching is conducive to the crystal perfection of PGA fiber
single low-temperature stretching can be divided into three stages: the stretching of amorphous regions
stretch-induced crystallization and the stretching of crystalline regions. High-temperature stretching compared with low-temperature stretching is more favorable for crystal perfection and structural evolution.
Abstract
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.
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