【摘要】 纳米S iO2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S iO2复合材料。通过DSC分析,研究纳米S iO2对聚丙烯结晶行为的影响。研究发现,纳米S iO2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。更多还原

【Abstract】 Nano-SiO₂ dispersed by ultrasonication technique was modified by silane coupling agent and dispersant agent A,and blended with PP to prepare PP/nano-SiO₂ composites by melt-blending process.The influence of nano-SiO₂ on the crystallization behavior of PP was studied with differential scanning calorimetry（DSC）.Results showed that nano-SiO₂ 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.更多还原