聚硅氧烷热稳定性研究进展

综述了聚硅氧烷的热老化机理、影响其热稳定性的因素和提高其热稳定性的途径。聚硅氧烷的热老化反应主要包括热解聚和热氧化两个反应。氧气、水或醇、酸、碱或残留催化剂、硅油、机械外力、填料、聚硅氧烷的链端基等都会影响聚硅氧烷的热稳定性。提高聚硅氧烷热稳定性的途径主要有改变聚硅氧烷的分子结构以及在体系中添加热稳定剂。

Progress in the Research of the Thermal Stability of Polysiloxanes

The mechanisms of thermal aging, the facts that decrease the thermal stability and how to enhance the thermal stability of polysiloxanes are reviewed. Thermal depolymerization and thermo\|oxidative degradation are the main reactions during the thermal aging of polysiloxanes. Accordingly, the thermal stability of polysiloxanes may be influenced by oxide, water, alcohol, acid, base, residual catalyst, silicone oil, mechanical stress, filler or the end groups of itself. Changing the structure of polysiloxane and adding antioxidants or stabilizers can improve the thermal stability of polysiloxances.