Abstract
In this study, the polyimide-polyvinylpolymethylsiloxane composite aerogel (PPCA) was synthesized by two different methods, stepwise chemical liquid deposition (SCLD) and direct chemical liquid deposition (DCLD). It is found that polyimide (PI) chains can only be introduced into the backbone of amine-modified polyvinylpolymethylsiloxane (PVPMS) by SCLD method. The introduced PI can further crosslink with PVPMS to form a PI-PVPMS cross-linked network structure, which makes the skeleton dense and endows the sample with high mechanical strength. For DCLD method, PI chains can only be coated on the surface of the sample rather than the whole skeleton, which leads to a loose internal structure. Furthermore, samples prepared by SCLD method possess higher initial thermal decomposition temperature compared with that by DCLD method.
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