Evolution of the microstructure and morphology of polyimide fibers during heat-drawing process

CORC > 上海应用物理研究所 > 中国科学院上海应用物理研究所 > 中科院上海应用物理研究所2011-2017年

	Evolution of the microstructure and morphology of polyimide fibers during heat-drawing process
	Lin, JY
刊名	RSC ADVANCES
	2014
卷号	4 期号:84 页码:44666—44673
关键词	REGENERATED CELLULOSE FIBERS HIGH-PERFORMANCE FIBERS X-RAY-SCATTERING MECHANICAL-PROPERTIES FILMS DEFORMATION POLYMERS
ISSN号	2046-2069
通讯作者	qhzhang@dhu.edu.cn
英文摘要	The development of crystalline structure and morphology for polyimide (PI) fibers in the heat-drawing process was investigated by simultaneous synchrotron wide-angle X-ray diffraction (WAXD) and small-angle X-ray scattering (SAXS). WAXD results indicated that the drawing process resulted in a high crystal orientation and ordered crystal structure. Especially, as the drawing ratio increases to 2.0, a well-defined crystalline structure forms in the fibers. We propose that the highly oriented molecular chains induce the formation of crystalline regions. Namely, an orientation-induced crystallization occur with stretching in the case of the heat-drawing polyimide fibers. The meridional scattering streaks in the SAXS patterns for the as-spun fibers suggest the presence of periodic lamellar structure in the fibers. These crystalline lamellae may evolve to more complete crystalline regions. The size of microvoids in the cross-section of the PI fibers is analyzed by SAXS. As a result, the drawing process leads to the orientation of microvoids along the fiber, and to reduced diameter of the microvoids in the fiber. Dynamic thermomechanical analysis indicates that the activation energy E-a of alpha relaxation increases with the increase in the crystallinity and orientation in the fibers.
收录类别	SCI
语种	英语
WOS记录号	WOS:000342993800049
公开日期	2015-03-13
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/14124]
专题	上海应用物理研究所_中科院上海应用物理研究所2011-2017年
推荐引用方式 GB/T 7714	Lin, JY. Evolution of the microstructure and morphology of polyimide fibers during heat-drawing process[J]. RSC ADVANCES,2014,4(84):44666—44673.
APA	Lin, JY.(2014).Evolution of the microstructure and morphology of polyimide fibers during heat-drawing process.RSC ADVANCES,4(84),44666—44673.
MLA	Lin, JY."Evolution of the microstructure and morphology of polyimide fibers during heat-drawing process".RSC ADVANCES 4.84(2014):44666—44673.