Synthesis of Heat-resistant Silicone Resin and Studies on its Thermal and Curing Properties

Abstract

The silicone resin is synthesized using hydrolysis-polycondensation method from phenyl and methyl chlorosilane, and the factors influencing this synthesis are investigated. The results indicate that silicone resin can be synthesized when the hydrolysis temperature is 70℃ and n(H2O)/n(Cl) is between 5: 1 and 8: 1. And the IR analysis shows that silicone resin possesses hydroxyl end group. The thermal properties are investigated using thermo-gravimetric analysis ( TG) , differential thermogravimetric analysis ( DTG) and muffle furnace test, and the effects of curing agents, such as KH-CL and triethanolamine, on the thermal properties of silicone resin were also discussed. It is found that silicone resin possesses excellent thermal stability with onset temperature at about 400 ℃ , and its mass loss is mainly caused by the unzipped degradation occurred between 400 - 500 ℃ , and the rearranged degradation occurred after 500 ℃ . But it thermal properties decreases at air atmosphere duo to the oxidative-degradation of organic groups. Silicone resin can cure at room temperature with KH-CL, and its thermal stability is improved after cured.