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。
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 ...
出处
《航空材料学报》
EI
CAS
CSCD
2006年第3期168-171,共4页
Journal of Aeronautical Materials
