高等学校化学学报2011，Vol.32Issue(4)：952-956,5.
牵伸倍率对联苯型聚酰亚胺纤维形貌、取向及性能的影响
Effect of Draw Ratio on the Morphology, Orientation and Properties of Biphenyl-type Polyimide Fibers
摘要
Abstract
Novel biphenyl-containing polyimide (PI) solution based on pyromellitic dianhydride (PMDA)/3,3', 4,4'-biphenyl-tetracarboxylic dianhydfide ( BPDA ) / O-tolidine ( OTOL ) were synthesized via co-polymerization. Its PI fibers were produced through dry-jet wet-spinning technique. These fibers were characterized with field emission scanning electron microscopy ( FESEM ), wide-angle X-ray diffraction ( WAXD ), fiber mechanical property tester, dynamic mechanical analyzer(DMA) and thermogravimetric analyzer(TGA). Particularly, effects of draw ratio on morphology, orientation, mechanical properties and thermal properties of PI fibers were discussed. PI fibers have smooth surface, relatively uniform diameter, and skin-core structure in cross-section. The diameter and filament of PI fibers decrease and the degree of orientation increases with draw ratio. Crystallinity of these fibers is very low. The tensile strength and tensile modulus of the PI fibers can reach 2.95 and 100.0 GPa when draw ratio is 2.8. Generally, 10％ weight loss of these PI fibers corresponds to temperatures above 580 ℃ and it indicates that these fibers possess excellent thermal stability under nitrogen atmosphere two relaxations above room temperature can be found in DMA curves. The glass transition temperature ( Tg ) of PI fibers is above 340 ℃.关键词
聚酰亚胺纤维/形貌/结晶取向/力学性能Key words
Polyimide fiber/ Morphology/ Orientation/ Mechanical property分类
化学化工引用本文复制引用
张春玲,邱雪鹏,薛彦虎,高连勋,丁孟贤,姬相玲..牵伸倍率对联苯型聚酰亚胺纤维形貌、取向及性能的影响[J].高等学校化学学报,2011,32(4):952-956,5.基金项目
吉林省科技厅项目(批准号:20086019)资助. （批准号:20086019）
