【摘要】 采用共混纺丝法制备了纳米二氧化钛(TiO2)/聚苯硫醚(PPS)共混纤维,借助声速取向仪、差示扫描量热仪、扫描电子显微镜和热重分析仪等研究了纳米TiO2对共混纤维取向、热性能、形貌、热稳定性以及耐紫外老化性能的影响。结果表明:随纳米TiO2含量增加,共混纤维的取向度逐渐下降;少量纳米TiO2的加入对PPS纤维的熔融温度没有影响,但其重结晶温度升高,结晶度大幅提高;少量纳米TiO2的加入有利于改善PPS纤维的耐紫外老化性能,经紫外老化192 h后,含w(TiO2)为1.5%的PPS纤维的断裂强度保留率和断裂伸长保留率分别为66.7%和70.5%,明显高于纯PPS纤维的39.1%和26.6%,且纤维表面裂纹明显减少;w(TiO2)为1%～3%时,纳米TiO2不会影响PPS纤维的热稳定性。更多还原

【Abstract】 Nano-titanium dioxide(TiO2)/polyphenylene sulfide(PPS) blend fiber was prepared by blend spinning process.The effects of nano-TiO2 on the orientation,thermal property,morphology,thermal stability and ultraviolet aging resistance of blend fiber were studied by sonic velocity orientation test,differential scanning calorimetry,scanning electron microscopy and thermogravimetry analysis.The results showed that the orientation degree of the blend fiber gradually dropped while increasing nano-TiO2 content;trace nano-TiO2 did not affect the melting point of PPS fiber,but raised the recrystallization temperature and considerably increased the crystallinity,and helped to improve the ultraviolet aging resistance of PPS fiber;after 192 h ultraviolet aging,PPS fiber with w(TiO2) of 1.5% had the retention ratio of breaking strength and elongation at break 66.7% and 70.5%,profoundly higher than those of pure PPS fiber,39.1% and 26.6%,respectively;meanwhile,the surface crack obviously decreased;nano-TiO2 did not affect the thermal stability of PPS fiber as w(TiO2) was 1%-3%.更多还原