【摘要】 以聚苯硫醚(PPS)切片为原料，通过熔融纺丝、拉伸、低张力下热定形制备直径约0.6 mm的PPS单丝，主要研究了热定形温度对单丝分子链取向、晶体结构及性能的影响。结果表明：在拉伸倍数4.3的条件下，拉伸温度为96℃时可获得结构与性能均较好的PPS拉伸丝，其取向因子达0.51,结晶度为64.6%,断裂强度为2.89 cN/dtex;在0.1 N张力下对拉伸丝进行热定形处理，随着热定形温度的升高，PPS单丝的取向因子、结晶度、断裂强度均呈先增后降的变化趋势，165～175℃为较佳的热定形温度窗口；热定形温度为175℃时，PPS单丝的取向及结晶结构好，且具有良好的力学性能及热尺寸稳定性，取向因子为0.49,结晶度为65.3%,(110)晶面晶粒尺寸为107.6 nm,断裂强度为2.47 cN/dtex,干热收缩率为2.7%。更多还原

【Abstract】 Polyphenylene sulfide(PPS) monofilaments with a diameter of about 0.6 mm were prepared from PPS chips via melt spinning, drawing, and heat setting under low tension. The effects of heat setting temperature on molecular chain orientation, crystalline structure, and properties of the monofilaments were systematically investigated. The results showed that under a draw ratio of 4.3, PPS drawn filaments with favorable structure and properties were obtained at a drawing temperature of 96 ℃, exhibiting an orientation factor of 0.51, a crystallinity of 64.6%, and a breaking strength of 2.89 cN/dtex; when the drawn filaments were heat-set under a tension of 0.1 N, the orientation factor, crystallinity, and breaking strength of the PPS monofilaments first increased and then decreased with increasing heat setting temperature, and a temperature window of 165-175 ℃ was identified as optimal; at a heat setting temperature of 175 ℃, the PPS monofilaments exhibited well-developed orientation and crystalline structures, along with good mechanical properties and thermal dimensional stability; specifically, the orientation factor was 0.49, the crystallinity was 65.3%, the crystallite size of the(110) plane reached 107.6 nm, the breaking strength was 2.47 cN/dtex, and the dry heat shrinkage was 2.7%.更多还原