聚硅氧烷交联剂与掺杂SiO2协同增强RTV硅橡胶的研究

摘要

A new PCA/Silica/PDMS compounds was prepared by incorporating both polysiloxane curing agent (PCA) and commercial precipitated SiO2.The Shear viscosities,mechanical properties,swelling of PCA/Silica/PDMS system were investigated.PCA lowered the shear viscosity and improved processing property of PCA/Silica/PDMS compounds.The rubber exhibited excellent reinforcement,due to good interaction between PDMS chains and precipitated SiO2,as well as SiO2 generated in situ from PCA.%研究了新型聚硅氧烷交联剂(PCA)与沉淀法SiO2协同增强室温硫化硅橡胶及其增强机理.发现PCA的引入可有效降低PCA/SiO2/PDMS硅橡胶的黏度,提高硫化胶的拉伸强度,保持良好的扯断伸长率,体系中原位生成的SiO2粒子和掺杂的SiO2粒子与PDMS聚合物之间有强烈的相互作用,协同补强效果好.