【摘要】 聚四氟乙烯(PTFE)初生中空纤维是拉伸制备PTFE中空纤维膜的先驱体,其力学性能直接影响制膜工艺和产品性能。系统考察了推压成型温度、速度和压力条件对PTFE初生纤维力学性能的影响,并通过纤维表面微观结构分析,探究其力学性能变化的内在因素。结果表明,较高的推压成型温度和压力、较低的速度,有利于制备综合力学性能较优的PTFE初生中空纤维;纤维表面树脂初级粒子纤维化是影响其力学性能的内因;相比,推压成型温度和压力变化对树脂粒子纤维化影响较大。当推压成型温度、速度和压力分别控制为50~80℃,9~15 mm/min和38~42MPa时,纤维综合力学性能较好。更多还原

【Abstract】 The polytetrafluoretyhylene( PTFE) nascent hollow fiber is the precursor for preparation of PTFE hollow fiber membrane,of which the mechanical properties have a direct effect on the film process and product performance. Factors affecting extrudates ’ mechanical properties such as extrusion temperature,extrusion rate and extrusion pressure were investigated systematically. And by surface micro-structure analysis,the internal factors of change of the mechanical properties of the fiber were explored. Results show that: PTFE nascent hollow fiber with good over-all properties benefits from the rising in extrusion temperature and pressure and the falling in extrusion rate; the fiberization of resin particles in the surface of fiber is the internal cause of the change of mechanical properties; extrusion temperature and rate affect the iberization of resin particles greatly. The fiber with good over-all properties is prepared when the extrusion temperature,rate and pressure are 50 ~ 80 ℃,9 ~ 15 mm / min and 38 ~ 42 MPa,respectively.更多还原