摘要
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。
In order to investigate the spinnability and processing performance of the photocatalytic functional poly- propylene （PP） fiber, SiO2 coated modified nano-TiO2 particles （SIO2 @TiO2 ） were used as additive and PP was modified by blending firstly. Then, the extensional theological properties of SiO2 @TiO2/PP blend melts were tested by capillary rheometer, and the influences of SiO2 @TiO2 on the properties of PP were studied by XRD and DSC. The results demonstrate that the SiO2 @TiO2/PP blend melts belong to the fluids of extensional thinning type. With the increasing of temperature, both of the extensional stress and extensional viscosity of melts decreasel extensional viscosity increases with the increasing of additive amount, and extensional flow activation energy reduces with the increasing of extensional strain rate. The addition of SiO2@TiOz does not change the crystalline structure of PP sig nifieantly, but enhance the performance of crystallization. When the content of SiO2 @TiO2 is 4wt, the crystallini ty of the blend melt is 8.6% higher than that of pure PP. SiO2@TiO2 leads PP to form more compact crystal struc- ture, which has important influences on the properties of materials.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2015年第5期1361-1366,共6页
Acta Materiae Compositae Sinica
基金
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
SiO2
TiO2
polypropylene
blending modification
extensional flow
crystallization
