Preparation method of polycarbosilane

Abstract

The invention relates to the technical field of organosilicon and provides a preparation method of polycarbosilane in order to solve the problems in polycarbosilane preparation at present. The preparation method is characterized by taking chloromethyl chlorosilane as a raw material, synthesizing a polycarbosilane intermediate in an organic solvent and then preparing the polycarbosilane by using a reducing agent. The preparation method provided by the invention has the advantages that the operation is convenient, and the time is shortened; meanwhile, the number-average molecular weight of the prepared polycarbosilane is higher, and the demands of preparing an organic functional material can be met.

Description

technical field

[0001] The invention relates to the technical field of organosilicon, in particular to a preparation method of polycarbosilane. Background technique

[0002] Polycarbosilane (PCS) is an organic precursor widely used in the preparation of special fibers (such as SiC fibers) and composite ceramics. SiC fibers have high strength and high hardness, high thermal stability and oxidation resistance, and low thermal expansion. coefficient and low density, high temperature stability (chemical, microstructural and mechanical stability) of SiC fiber in inert and oxidizing environments, coupled with its excellent mechanical properties (high breaking strength, stiffness and low creep rate, etc.) Making SiC fibers the best alternative for the production of structural composites with a wide range of applications, ranging from heat exchangers and hot gas filters to power production and aerospace machinery components.

[0003] The most important synthetic method of PCS is th...

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