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通过单螺杆挤出机挤出,利用牵引机的不同牵引速度获得不同液晶聚合物纤维试样,采用万能试验机、电子显微镜扫描(SEM)分析其力学性能和内部取向。结果表明:随着牵引速度增大,其内部的取向逐渐规整,内部组成的微纤排列越紧凑,导致液晶聚合物纤维的弹性模量增大;同时,当牵引速度到达一定数值时,取向程度不再增大,液晶聚合物纤维的弹性模量呈下降趋势;在一定时间段内,经过温度为150℃的后处理,将使液晶聚合物纤维内部分子结构达到更完善的取向状态,力学性能有所提高。
Through the extrusion of single screw extruder, different liquid crystal polymer fiber samples were obtained by using different traction speed of traction machine. The mechanical properties and internal orientation were analyzed by universal testing machine and electron microscope (SEM). The results show that as the traction speed increases, the internal orientation of the fiber becomes regular and the arrangement of the internal microfibers becomes more compact. As a result, the elastic modulus of the liquid crystal polymer fiber increases. At the same time, when the traction speed reaches a certain value, the degree of orientation No longer increases, the elastic modulus of the liquid crystal polymer fibers is on a downward trend; after a certain period of time, the post-treatment at a temperature of 150 ° C will result in a more perfect orientation state of the molecular structure of the liquid crystal polymer fiber. The mechanical properties has seen an increase.