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Catalytic rearrangement preparation method of polycarbosilane
The invention relates to a method for preparing polycarbosilane through cracking rearrangement of a cyclic silane compound or chain polysilane under the catalytic effect of trace (lower than 1wt%) boron-containing catalyst. According to the invention, polydimethylsilane (PDMS) or a pyrolysis product thereof which is a liquid-state silane-carbosilane compound (LPS) is adopted as a raw material; lower than 1wt% (relative to the amount of the raw material) of the boron-containing catalyst is added; the temperature is gradually increased to a reaction temperature under a normal pressure or a high pressure, such that a pyrolysis/rearrangement reaction is carried out, and solid-state polycarbosilane (PCS) with relatively high ceramic yield is obtained. The method provided by the invention has the advantages of short reaction time, high synthesis yield, good product quality, simple equipment and safe operation. The prepared polycarbosilane is a SiC precursor polymer, and can be used in the preparations of SiC fiber and SiC-based composite materials.
Catalytic rearrangement preparation method of polycarbosilane
The invention relates to a method for preparing polycarbosilane through cracking rearrangement of a cyclic silane compound or chain polysilane under the catalytic effect of trace (lower than 1wt%) boron-containing catalyst. According to the invention, polydimethylsilane (PDMS) or a pyrolysis product thereof which is a liquid-state silane-carbosilane compound (LPS) is adopted as a raw material; lower than 1wt% (relative to the amount of the raw material) of the boron-containing catalyst is added; the temperature is gradually increased to a reaction temperature under a normal pressure or a high pressure, such that a pyrolysis/rearrangement reaction is carried out, and solid-state polycarbosilane (PCS) with relatively high ceramic yield is obtained. The method provided by the invention has the advantages of short reaction time, high synthesis yield, good product quality, simple equipment and safe operation. The prepared polycarbosilane is a SiC precursor polymer, and can be used in the preparations of SiC fiber and SiC-based composite materials.
Catalytic rearrangement preparation method of polycarbosilane
LI YONGMING (author) / YANG XIAOGAN (author) / XU CAIHONG (author) / HE LIJUAN (author)
2016-01-27
Patent
Electronic Resource
English
IPC:
C08G
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
,
Makromolekulare Verbindungen, anders erhalten als durch Reaktionen, an denen nur ungesättigte Kohlenstoff-Kohlenstoff-Bindungen beteiligt sind
/
C04B
Kalk
,
LIME
/
D01F
Chemische Gesichtspunkte bei der Herstellung von produzierten Filamenten, Zwirnen, Fasern, Borsten oder Bändern
,
CHEMICAL FEATURES IN THE MANUFACTURE OF MAN-MADE FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
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