Tensile modulus enhancement and mechanism of polyimide fibers by post-thermal treatment induced microvoid evolution

	Tensile modulus enhancement and mechanism of polyimide fibers by post-thermal treatment induced microvoid evolution
	Yi, Xiaolin 1,4; Gao, Yunyun 1; Zhang, Mengying 2; Zhang, Chunbo 1; Wang, Qiao 3,4; Liu, Guoming 1; Dong, Xia 1,4; Wu, Dezhen 2; Men, Yongfeng 3,4; Wang, Dujin 1,4
刊名	EUROPEAN POLYMER JOURNAL
	2017-06-01
卷号	91 页码:232-241
关键词	Polyimide Fiber Annealing Microvoid Mechanical Property
英文摘要	The correlation between mechanical property and the microstructure of two-step wet spinning polyimide (PI) fibers after thermal annealing was investigated. In-situ wide-angle X-ray diffraction (WAXD) and ex-situ small angle X-ray scattering (SAXS) methods were utilized to study the liquid crystal-like structure orientation and microvoids structure (the length and the orientation angle of microvoids) for PI fibers during annealing process. The effects of annealing temperature and time on the microstructure were systematically studied. The results reveal that the liquid crystal-like structure and the orientation degree keep nearly the same after annealing. Both of the molecular chain relaxation and the evolution of aligned microvoids are attributed to the change in tensile modulus. In low pre-drawing fiber, a slight decrease in microvoid length and an obvious rise in microvoid orientation angle lead to improved tensile modulus after annealing. In highly pre-drawn fiber, the tensile modulus decreases first due to de-orientation of polymer chains and then increase owing to disordering microvoids with decreasing size. Our work demonstrates the relationship between microvoids and mechanical properties in annealed PI fibers which provides a new avenue to access high performance PI fiber by facile annealing method and a deep insight into the structure and properties of high performance PI fibers.
语种	英语
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/38403]
专题	化学研究所_工程塑料实验室
作者单位	1.Chinese Acad Sci, Beijing Natl Lab Mol Sci, Inst Chem, CAS Key Lab Engn Plast, Beijing 100190, Peoples R China 2.Beijing Univ Chem Technol, State Key Lab Chem Resource Engn, Beijing 100029, Peoples R China 3.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Yi, Xiaolin,Gao, Yunyun,Zhang, Mengying,et al. Tensile modulus enhancement and mechanism of polyimide fibers by post-thermal treatment induced microvoid evolution[J]. EUROPEAN POLYMER JOURNAL,2017,91:232-241.
APA	Yi, Xiaolin.,Gao, Yunyun.,Zhang, Mengying.,Zhang, Chunbo.,Wang, Qiao.,...&Wang, Dujin.(2017).Tensile modulus enhancement and mechanism of polyimide fibers by post-thermal treatment induced microvoid evolution.EUROPEAN POLYMER JOURNAL,91,232-241.
MLA	Yi, Xiaolin,et al."Tensile modulus enhancement and mechanism of polyimide fibers by post-thermal treatment induced microvoid evolution".EUROPEAN POLYMER JOURNAL 91(2017):232-241.