Preparation method of silanization thermal rearrangement polybenzoxazole gas separation membrane material

The invention provides a synthesis method and application of a novel silanization thermal rearrangement polybenzoxazole thin gas separation membrane, and the synthesis method comprises the following steps: (1) firstly synthesizing polyamide acid, and then adding pyridine serving as a catalyst and acetic anhydride serving as a dehydrating agent to obtain polyimide; (2) washing, drying and spreading the polyimide solution to obtain a polyimide film precursor; and (3) carrying out heat treatment on the film to obtain the polybenzoxazole film for preparing the gas separation film. The method has the advantages that compared with a traditional polyimide film, the film subjected to heat treatment has excellent gas separation performance, and the variety and application of the gas separation film are enriched. The polyimide obtained by the scheme has good dissolvability and good film-forming property, and can be applied to separation of mixed gas. 本发明提供了一种新型硅烷化热重排聚苯并恶唑薄气体分离膜的合成方法及应用，包括以下步骤：(1)首先合成了聚酰胺酸，再加入催化剂吡啶和脱水剂乙