热处理对Vectran纤维的结构与性能的影响

摘要

Vectran resin was melt spun into an as-spun Vectran fiber on a single-screw extruder and was produced into Vectran fiber by preheating at 180 ℃ for 1 h in a high-temperature chamber prior to heating at 200-270 ℃ for 10-60 h in nitrogen at-mosphere. The effects of the heat treatment time and temperature on the structure and properties of Vectran fiber were studied. The results showed that the fiber strength grew rapidly in 10 h and rose slowly after 40 h while heat treated at 200-260 ℃;the melting point of Vectran fiber was increased while elevating the heat treatment temperature;the crystalline structure of Vectran fi-ber was impacted as the heat treatment time was 20 h and the temperature exceeded 260℃;the mechanical properties of Vectran fiber was improved, the melting point was increased, the crystalline structure was perfected, and the surface morphology of Vect-ran fiber was not affected as the heat treatment temperature was 200-260 ℃ and the time less than 40 h.%将Vectran树脂在单螺杆挤出机上进行熔融纺丝,制得Vectran初生纤维,初生纤维在氮气气氛中,于高温腔室中180℃预热1 h后,分别在200~270℃下热处理10~60 h,制得Vectran纤维,研究了热处理时间和热处理温度对Vectran纤维的结构与性能的影响。结果表明：在200~260℃下热处理Vectran初生纤维,0~10 h时,纤维强度上升较快,40 h时强度增长缓慢；随着热处理温度的升高,Vectran纤维的熔点也随之上升,在热处理时间为20 h时,处理温度超过260℃,Vectran纤维的结晶、结构受到影响；在热处理温度为200~260℃,时间小于40 h处理Vectran纤维,可使Vectran纤维的力学性能增强,熔点提高,结晶完善,但纤维的表观形貌没有受到影响。