Study On The Modification Of Silica And Properties Of Composites Formed By The Silica And Polymer

In this paper, precipitation white carbon was modified, then was mixed with polyacrylate emulsion and filled in the polymethylmethacrylate in order to study the properties of their formed composites, and the effect of interfacial compatibility and strength to their filled polymer were revealed.Firstly, the condition of modification of precipitation white carbon, modified by silane coupling agent (WD10,WD70), and the properties of polyacrylate membrane were researched. The results showed that the modified white carbon show excellent hydrophobic, and their filling polyacrylate membrane, filled with white carbon modified by WD-70 was more effective ,were improved on flexibility, adherence and resist impact, and it can be unavailable because of more content ratio of silane coupling agent. Secondly, the encapsulation of white carbon with polymethylmethacrylate and its conditions were discussed, then the properties of composites formed with this and polyacrylate was researched. The results showed that it is possible for seed of hydrophobic white carbon to realize encapsulation of white carbon with polymer, and in this reaction system, the concentration of surfactant, should be close to its CMC. The properties of polyacrylate membrane filled with modified silica was improved comparing to that filled with unmodified silica. Finally, the PMMA/SiO2 micron-composites was prepared by in-stu polymerization, and the properties of this composites filled with different surface characteristic and content ratio white carbon was study. The results revealed that improving interfacial compatibility and strength between micron-white carbon and polymer were beneficial to improving the mechanics, thermal stability and resistant solvent.