CAJ | 학술논문

SiBCN陶瓷前驱体的合成对于制备非晶SiBCN 陶瓷有着重要的意义，本文研究了SiBCN聚合物前驱体聚合过程中不同阶段的产物的结构变化，研究表明在合成前驱体的氨解过程中，单体聚合反应的机理是首先氨气与氯硅烷单体上的氯发生反应生成伯胺，然后伯胺与其他的氯硅烷单体上的氯反应聚合生成仲胺。最终产物中伯胺和仲胺的数量由氨气流量的大小决定。氨气流量较小时，产物主要是仲胺；氨气流量大时，以伯胺为主。在此过程中并不会发生伯胺与伯胺发生反应脱掉氨气生成仲胺的化学反应。因此，氨气流量过大会降低陶瓷前驱体的聚合度。
SiBCN도자전구체적합성대우제비비정SiBCN 도자유착중요적의의，본문연구료SiBCN취합물전구체취합과정중불동계단적산물적결구변화，연구표명재합성전구체적안해과정중，단체취합반응적궤리시수선안기여록규완단체상적록발생반응생성백알，연후백알여기타적록규완단체상적록반응취합생성중알。최종산물중백알화중알적수량유안기류량적대소결정。안기류량교소시，산물주요시중알；안기류량대시，이백알위주。재차과정중병불회발생백알여백알발생반응탈도안기생성중알적화학반응。인차，안기류량과대회강저도자전구체적취합도。
The synthesis of SiBCN polymer precursor is of great importance for the amorphous SiBCN ceramics .In this paper ,the structure evolution of the products in each steps of polymerization was researched .Polymerization reaction occurs during ammonolysis process .The NH2 group is firstly produced by the reaction between NH3 and -Cl ,and then -NH2 reacts with -Cl ,whose reaction product is -NH - .The contents of -NH2 and -NH - are affected by the flow of ammonia gas . When the flow is low ,the main reaction product is -N H - ,and w hen the flow is high ,it is -N H2- .Therefore ,the high flow of ammonia gas would decrease the degree of polymerization .