SiO2包覆改性纳米TiO2粒子对聚丙烯拉伸流变性能和结晶行为的影响

复合材料学报, 2015, 32(5): 1361-1366. doi: 10.13801/j.cnki.fhc1xb.20150128.001

SiO2包覆改性纳米TiO2粒子对聚丙烯拉伸流变性能和结晶行为的影响

郁萍华 ^1, , 张顺花 ^2, , 毛雄亮 ^3, , 张如心 ^4, , 杨勉 ^5,

1.浙江理工大学材料与纺织学院,杭州,310018

2.浙江理工大学材料与纺织学院,杭州,310018

3.浙江理工大学材料与纺织学院,杭州,310018

4.浙江理工大学材料与纺织学院,杭州,310018

5.浙江理工大学材料与纺织学院,杭州,310018

基金项目: 浙江省科技计划(2013T103)

关键词： SiO2 , TiO2 , 聚丙烯 , 共混改性 , 拉伸流变 , 结晶

Influences of SiO2 coated modified nano-TiO2 particles on extensional rheological property and crystallization behavior of polypropylene

Keywords： SiO2 , TiO2 , polypropylene , blending modification , extensional flow , crystallization

为了探究光催化功能性聚丙烯(PP)纤维的可纺性及加工性能,首先以SiO2包覆改性纳米TiO2粒子(SiO2@TiO2)为添加剂,对PP进行共混改性.然后,用毛细管流变仪测试了SiO2@TiO2/PP共混熔体的拉伸流变性能,用XRD和DSC研究了SiO2@TiO2对PP性能的影响.结果表明:SiO2@TiO2/PP共混熔体属于拉伸变稀型流体.熔体的拉伸应力和拉伸黏度均随温度的升高而下降;拉伸黏度随添加剂用量的增加而增大,拉伸流动活化能随拉伸应变速率的提高而降低.SiO2@TiO2的加入不会明显改变PP的结晶结构,但会使结晶性能增强,当SiO2@TiO2的含量为4wt％时,共混熔体的结晶度比纯PP的高8.6％.SiO2@TiO2能使PP形成更为紧密的晶体结构,这对材料的性能具有重要影响.

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