双酚A氰酸酯自聚反应机理研究

为了得到性能稳定的氰酸酯,通过傅里叶红外光谱、高效液相色谱、核磁共振等方法研究了双酚A型氰酸酯单体的自聚反应历程,并提出可能的反应方程式以期得到性能稳定的氰酸酯树脂。结果表明,氰酸酯自聚主要通过三聚反应直接生成三聚体、五聚体、七聚体等低聚物,而后体系分子质量逐渐增大形成交联网状结构,并不产生二聚体过渡结构;主催化剂并不改变氰酸酯聚合反应机理,仅是通过降低反应活化能使反应速度加快。

Study on self-polymerization mechanism of bisphenol A type cyanate ester

The polymerization mechanism of bisphenol A type cyanate ester monomer catalyzed by organic titanium was analyzed by FTIR,HPLC,MS and NMR to obtain cyanate ester with stable performance.The possible reaction equation was presented.The results showed the reaction mechanism was mainly the tricyclopoly-merization of cyanate function group yielding trimer,pentamer,and heptamer,etc.Then the molecular weight of reaction system turned to higher and higher to form the 3D network and no dimer was found.The organic titanium catalyst could not change the polymerization mechanism of cyanate,only decreased the activation energy of resin system to promote the reaction rate.