浸热水-光照对硅酮结构密封胶性能影响的研究

Study on Influences of Soaking in Hot Water-light on Performance of Silicone Structural Sealant

对浸热水-光照老化前后硅酮结构密封胶的拉伸粘结性、交联密度、表面分子结构、热失重行为以及动态力学性能进行了研究。结果表明,经过浸热水-光照后,硅酮结构密封胶的交联密度下降,最大拉伸强度降低;其表面分子结构没有发生明显变化,但体系发生部分降解,耐热性变差;其低温下的储能模量下降明显,低温结晶性降低。

The article studies tensile bonding strength,crosslinking density,surface molecular structure,thermal weight loss and dynamic mechanical performance of silicone structural sealant before and after its aging through soaking in hot waterlight.Results show after soaking in hot water-light aging,its crosslinking density is declined and the max tensile strength is reduced;while the surface molecular structure does not have obvious changes,but the system has some degradation and the heat resistance is weakened;there is an obvious decline for the energy storage modulus at low temperature,and the low temperature crystallinity is lowered.