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以熔融纺丝法制备出不同结晶度的各向同性聚苯硫醚纤维作为样品,根据密度和声速测定值确定出PPS晶相和无定形相的本征横向声模量E0⊥,c(4.40 GPa)和E0⊥,am(1.99 GPa).利用密度梯度法测定出的结晶度Xc和X-衍射法测定的晶区取向因子fc,按照Samules模型计算出不同牵伸和定型工艺下制备的PPS纤维样品的非晶区取向因子(fam),在此基础上分析PPS纤维抗张强度与牵伸定型工艺参数、结构之间的关系.结果表明,PPS纤维的最佳牵伸温度及紧张热定型温度分别在90℃和190℃附近;提高PPS纤维的牵伸温度及紧张热定型温度可以增加纤维的结晶度,在一定范围内对纤维抗张强度的增加有促进作用;但较高的牵伸温度及紧张热定型温度不利于纤维非晶区取向的提高,造成PPS纤维抗张强度降低.牵伸倍数的增加可以有效提高PPS纤维的非晶区取向程度,抗张强度也随着增加.
The isotropic polyphenylene sulfide fibers with different crystallinity were prepared by melt spinning method as samples. The intrinsic transverse acoustic moduli E0⊥, c (4.40 GPa) and E0⊥, am (1.99 GPa) respectively.Using the crystallographic Xc determined by the density gradient method and the orientation factor fc of the crystalline zone determined by the X-ray diffraction method, the PPS fibers prepared under different drawing and setting processes were calculated according to the Samules model (Fam), based on which the relationship between the tensile strength of PPS fiber and the drawing process parameters and structure was analyzed.The results showed that the optimum drawing temperature and the heat setting temperature of PPS fiber Respectively, at around 90 ℃ and 190 ℃. Increasing the drawing temperature and heat setting temperature of PPS fibers can increase the crystallinity of the fibers and promote the increase of the tensile strength of the fibers within a certain range. However, the higher drawing temperature Tensile heat setting temperature is not conducive to the improvement of fiber orientation, resulting in the decrease of tensile strength of PPS fiber.With the increase of draw ratio, the orientation of amorphous region of PPS fiber can be effectively improved and the tensile strength also increases.