氮化硼纤维先驱体聚合物的合成及其表征

以三氯化硼与氯化铵为基础原料合成了三氯环硼氮烷（TCB），然后将TCB和三氯化硼分别与甲胺反应制得TCB的衍生物（CH3NH）3N3B3H3和B（NHCH3）3单体，将这些衍生物混合后在一定条件下进行缩合反应得到氮化硼先驱体。从合成方法、反应机理及其产物的结构性能表征等方面研究了氮化硼陶瓷纤维的先驱体，并且用IR、NMR、EA．XRD及DSC等表征方法对先驱体的结构、成分及性能进行了分析。结果表明：先驱体中含有B、C、N、H元素，存在CH3、B-N、N—H、G—H、BN六元环等结构单元。最后，对此先驱体进行了试纺丝，并用扫描电镜观察了所得纤维的形态。

Synthesis and Characterization of the Precursor for BN Ceramic Fiber

The process for synthesizing a new precursor for boron nitride (BN) fibers was studied. At first, two compounds B (NHCH3)3 and (NHCH3)3N3B3H3 were synthesized in N2 at low temperatures from BCl3, CH3NH2 and TCB which were synthesized by reaction of NH4Cl and BCl3 at elevated temperatures. Then a new precursor polymer of BN ceramic fiber was obtained by polycondensation of these compounds. The synthesis process, the reaction mechanism, the products structure, etc. were discussed. The final polymers were char...