Liquid curable boron-containing polycarbosilane and preparation method thereof
The technology of polycarbosilane and polysilicon carbosilane is applied in the field of liquid curable boron-containing polycarbosilane and its preparation, which can solve the problems of uneven distribution of boron elements, complicated preparation process, etc. Simple process and the effect of increasing compactness
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Examples
preparation example Construction
[0023] A method for preparing a liquid curable boron-containing polycarbosilane provided by an aspect of the embodiments of the present invention includes:
[0024] In an airtight reaction vessel, polysilocarbosilane and boron-containing monomers are subjected to the first reaction to generate liquid boron-containing polycarbosilane, wherein the polysilocarbosilane is a low-molecular-weight polydimethylsilane cracked at high temperature The product is liquid at room temperature and has a molecular weight of less than 1000g / mol;
[0025] The uniformly mixed reaction system comprising liquid boron-containing polycarbosilane, organosilicon compound containing C=C bond and catalyst is subjected to the second reaction to obtain liquid curable boron-containing polycarbosilane.
[0026] In some embodiments, the liquid boron-containing polycarbosilane is formed by reacting polysilocarbosilane and boron-containing monomers in a closed system, and is in a liquid state at room temperature,...
Embodiment 1
[0048] Polydimethylsilane is cracked at high temperature to obtain polysilocarbosilane, which has a molecular weight of 500 g / mol and is liquid at room temperature. Add 300g of liquid polysilocarbosilane and 6g of carborane into the closed device, replace the kettle with high-purity nitrogen three times, and then seal the device; then, start the temperature rise, and raise the temperature to 320°C at a certain heating rate, and stop the reaction after 2 hours. When it is lowered to room temperature, take out the reactant liquid boron-containing polycarbosilane LPBCS01;
[0049] Mix 100 g of the above LPBCS01 and 80 g of tetramethyltetravinylcyclotetrasilazane, add 0.001 g of chloroplatinic acid, stir evenly and react at 80°C for 1 min to obtain liquid curable boron-nitrogen-containing polycarbosilane LSiBCN.
[0050] The above-mentioned LSiBCN is cured at 200-300° C. for 1-3 hours under a nitrogen atmosphere to obtain boron-nitrogen-containing polycarbosilane gel SiBCN.
[00...
Embodiment 2
[0054] Take 100g of LPBCS01 and 75g of tetramethyltetravinylcyclotetrasiloxane in the above example 1 and mix them, add 0.002g of chloroplatinic acid, stir evenly and react at 60°C for 10min to obtain a liquid curable boron-oxygen-containing polycarbosilane LSiBCO .
[0055] The above-mentioned LSiBCO is cured at 200-300° C. for 1-3 hours under a nitrogen atmosphere to obtain boron-oxygen-containing polycarbosilane gel SiBCO.
[0056] The viscosity of LSiBCO measured by a viscometer is 38mPa·S, and the ceramic yield of SiBCO gel is 75% at 1000°C under a nitrogen atmosphere by thermogravimetric analysis.
[0057] The LSiBO precursor is suitable as a precursor of boron-oxygen-containing SiC ceramics.
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Abstract
Description
Claims
Application Information
- IPC
- C08G77/60; C04B35/571; C04B35/58; C04B35/622; C09D183/16; C09J183/16
- CPC
- C08G77/60; C04B35/571; C04B35/58; C04B35/622; C09D183/16; C09J183/16
- Inventors
- 莫高明; 宋育杰