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首页> 外文期刊>Journal of Applied Polymer Science >Preceramic polymer for Si-B-N-C fiber via one-step condensation of silane, BCl3, and silazane
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Preceramic polymer for Si-B-N-C fiber via one-step condensation of silane, BCl3, and silazane

机译：通过硅烷，BCl3和硅氮烷的一步缩合，用于Si-B-N-C纤维的预陶瓷聚合物

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摘要

A preceramic Polymer for Si-B-N-C fiber, polyborosilazane, has been synthesized by one-step condensation reaction of dichloromethylsilane, BCl3, and hexamethyldisilazane with high yield. The reaction mainly involves the condensation of Si-Cl and B-Cl with N-SiMe3 followed by SiMe3Cl evaporation and dehydrogenation between N-H and Si-H. The resulted polymer is a soluble colorless transparent solid with melting point of 70 C and molecular weight of 10,800. The backbone of the polymer is mainly composed of -Si-N-B-bridge with son e borazine rings. The polymer exhibits good processability and flexible Polymer fibers with diameter of 15-20 pm were obtained by melt spinning. Pyrolysis of the as-synthesized polymer to 1000 degrees C under nitrogen atmosphere results in a ceramic yield of 63 wt%, and the Obtained Si-B-N-C ceramic remains fully amorphous up to 1700 C, and only small amount of poorly crystallized BN, Si3N4, a Phases were observed upon heating at 1850 C. (c) 2008 Wiley Periodicals, Inc.
机译：通过二氯甲基硅烷，BCl3和六甲基二硅氮烷的一步缩合反应，合成了用于Si-B-N-C纤维的预陶瓷聚合物聚硼硅氮烷。该反应主要涉及Si-Cl和B-Cl与N-SiMe 3的缩合，然后SiMe 3 Cl蒸发并在N-H和Si-H之间脱氢。所得聚合物为熔点为70℃，分子量为10,800的可溶性无色透明固体。聚合物的主链主要由具有硼嗪环的-Si-N-B-桥组成。该聚合物表现出良好的可加工性，并且通过熔融纺丝获得了直径为15-20pm的柔性聚合物纤维。在氮气气氛下将合成后的聚合物热解至1000摄氏度，陶瓷产率为63 wt％，所获得的Si-BNC陶瓷在1700摄氏度以下仍保持完全非晶态，只有少量结晶度差的BN，Si3N4， a在1850℃加热时观察到相。（c）2008 Wiley Periodicals，Inc.

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