纳米二氧化硅对涤纶拉伸性能的影响

用原位聚合法制备不同含量纳米SiO2的PET/SiO2切片,并对其进行纺丝。测试结果显示:含纳米SiO2的PET切片纺丝温度降低了15℃,初生丝及POY的拉伸平台分别比对照样品大约25%和10%,二者的平台更平直,而且有明显的转折点。这表明含纳米SiO2的纤维有更好的可纺性和拉伸性能。热台偏光显微镜和DSC实验都证实了在降温过程中,微晶出现的起始温度比对照样品降低了15℃,但随后的结晶速率大大加快。电镜照片表明,含纳米SiO2的丝表面出现凹坑,这现象也将有利于染整工艺。

The Influence of Nano-SiO2 on Tensile Property of PET Fiber

PET/SiO2 nanocomposite prepared by in situ polymerization undergo the high speed melt spinning whose spinning temperatures are 15 ℃ lower than that o f pure PET. The draw region of filament and draw filament are 25 % and 10 % larg er respectively than that of pure PET. It can be concluded that the filaments co ntain nano- SiO2 take on better spinnability and tensile properties. The tempera ture of initial crystallization of the samples contain nano -SiO2, measured by p olarization and DSC, are 15 ℃ lower than that of pure PET. An SEM pattern shows that there are some micro-apertures distribute equably on the surface of PET fi lament, which is expected to good affect on dyeing.