A boron-containing double bond polysilane and a method for preparing the same

Liquid boron-containing double-bond polysilane is prepared in acetonitrile solvent using trihalosilane and 1,3-dihalopropylene through electrochemical reaction, which solves the safety and efficiency problems of the synthesis process in the existing technology and realizes efficient, low-cost large-scale production and high ceramic yield.

CN115637451BActive Publication Date: 2025-10-21SHANGHAI UNIV
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Patent Information

Application Number
CN202211421560.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-11-14
Publication Date
2025-10-21
Estimated Expiration
2042-11-14

AI Technical Summary

Technical Problem

The existing technology has problems in synthesizing boron-containing polysilanes, such as severe heat release, limited introduction of boron atoms, easy side reactions in the solvent THF, and high oxygen content, which leads to low ceramic yield and degraded mechanical properties.

Method used

Trihalosilane and 1,3-dihalopropylene are used as mixed monomers, acetonitrile is used as solvent, lithium perchlorate is used as electrolyte, and magnesium metal is used as electrode. Electrochemical reaction is carried out under a DC electric field, and sodium cyanoborohydride is added as a reducing agent to prepare liquid boron-containing double-bond polysilane, thereby avoiding the side reaction of THF and introducing double bonds.

Benefits of technology

It achieves safe, controllable, and low-cost preparation, reduces oxygen content, improves reaction efficiency, shortens reaction time, is suitable for large-scale production, has a high ceramic yield, and is applicable to the preparation of boron-containing silicon carbide ceramics.

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Abstract

The application discloses a liquid boron-containing double bond polysilane and a preparation method thereof. The method uses trihalosilane and 1,3-dihalogen propylene as mixed monomers, acetonitrile as a solvent, lithium perchlorate as an electrolyte, adopts a magnesium material as an electrode, and after reaching a set electric quantity under a direct current field with a set period of commutation, sodium cyanoborohydride is added to carry out a reduction reaction, so that the liquid boron-containing double bond polysilane is obtained. The acetonitrile solvent can greatly improve a reaction current and increase a reaction efficiency, and at the same time, boron atoms and double bonds are introduced onto the polysilane, and the method has a large-scale production potential. The boron-containing double bond polysilane synthesized by the method has a high ceramization yield, and can be used for preparing boron-containing silicon carbide ceramics.
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Citation Information

Patent Citations

  • Method for preparing boron-containing polysilane with electrochemistry

    CN109680297A

  • Liquid polysilane and preparation method thereof

    CN115028841A