聚丙烯/纳米SiO_2复合材料的结晶行为研究

纳米SiO2经过超声波分散后,用硅烷偶联剂和分散剂A组成的复合偶联剂体系进行表面处理,通过熔融共混法与聚丙烯混合制得聚丙烯/纳米SiO2复合材料.通过DSC分析,研究纳米SiO2对聚丙烯结晶行为的影响.研究发现,纳米SiO2在聚丙烯中起到异相成核的作用,使聚丙烯的结晶温度提高,结晶速率增大,微晶尺寸分布减小.非等温结晶动力学研究表明,不同降温速率下的成核机理基本不变.降温速率越快,单位结晶时间达到的相对结晶度越高.

Study on Crystalization Behavior Properties of PP/Nano-SiO2 Composite

Nano-SiO_2 dispersed by ultrasonication technique was modified by silane coupling agent and dispersant agent A,and blended with PP to prepare PP/nano-SiO_2 composites by melt-blending process.The influence of nano-SiO_2 on the crystallization behavior of PP was studied with differential scanning calorimetry(DSC).Results showed that nano-SiO_2 had an nucleating role on the crystallization of PP,resulting in higher crystallization temperature,nucleation rate,and lower the size distribution of crystallite.The research of non-isothermal crystallization kinetics showed that the nucleation mechanism had not significant change at different cooling rate.And the faster of the cooling rate,the higher of the crystallinity at the same crystallization time.