Thermomechanical and Adhesive Properties of Copolyimides with Alchoxysilyl Group in the Polysiloxane Segments

Abstract

Polysiloxane -block- polyimides with alchoxysilyl functionalities in polysiloxane segments, prepared from diethoxymethylsilane and polysiloxane -bolck- polyimides withvinyl group in polysiloxane segments by hydrosilylation reaction, were successfullysynthesized, and the thermomechanical and adhesive properties were studied. The alchoxysilyl groups were carried out crosslinking reaction by hydrolysis and following condensation. The resulting materials were insoluble even in polar solvents. The crosslinked density was increased with polysiloxane composition. After the crosslinking reaction, the copolymer with 50wt% of polysiloxane composition exhibited larger tensile modulus and lower thermal expansion coefficient. In addition, the thermal decomposition temperature was improved enormously in comparison with corresponding non-crosslinked copolymer. Furthermore, the copolymer films coated onto grass-plate was exhibited good adhesive properties even under highly temperature and under highly humid condition.