环氧树脂改性双环戊二烯型氰酸酯树脂固化反应性  

Cure reactions in the blend of dicyclopentandiene bisphenol cyanate ester with epoxy resin

作　　者：王金合[1] 梁国正[1] 王结良[1] 张增平[1] 

机构地区：[1]西北工业大学理学院应用化学系,西安710072

出　　处：《复合材料学报》2007年第2期55-60,共6页Acta Materiae Compositae Sinica

基　　金：教育部高等学校博士学科点专项科研基金(20050699034)

摘　　要：采用凝胶试验、FTIR和DSC等手段研究了环氧E-51与双环戊二烯型氰酸酯（DCPDCE）共聚体系的固化反应性以及阶梯固化过程中一OCN基、三嗪环、唑啉、嗯唑啉酮的变化情况。结果表明，环氧树脂既能够催化氰酸酯本身三聚成环反应，又对氰酸酯三聚成环反应有稀释作用。当环氧树脂含量（环氧占混合物总量的质量百分比）大于5wt％时，催化效果增加不明显，稀释作用加强；当环氧树脂含量约为25wt％时，以上两种作用效果基本平衡，改性体系的固化反应活性和纯DCPDCE相当。阶梯固化时，低温阶段（160～180℃）主要发生生成三嗪环和唑啉的反应，高温阶段（200-220℃）主要发生三嗪环和唑啉向嘌唑啉酮的转化反应。另外，～OCN基的低温转化率随着环氧树脂含量的增大而提高，固化树脂的最终结构组成和环氧树脂的含量有关。The cure reactions of dicyclopentandiene bisphenol cyanate ester （DCPDCE） associated with an epoxy resin （2,2-bis （4-glycidyloxy phenyD propane） were investigated using gel test, FTIR and DSC dynamic scanning at different stoichiometric ratios. It was observed that the epoxy resin not only catalyzed the trimerization of the cyanate ester which decreased the gel time of the EP/DCPDCE blends, but also diluted the cyanate ester which increased the gel time of the blends. When the weight fraction of EP in the EP/DCPDCE blend was 25 wt%, the two effects of EP were balanced and the gel time of the blend was almost the same as that of the pure DCPDCE. When the blends were cured following the curing cycle, the reaction of producing triazine rings and oxazoline took place at the low temperature （160- 180 ℃） step of the curing cycle, and the reaction of epoxy functions with the triazine rings former in the initial step as well as the isomerization of oxazoline to oxazolidinone took place at the high temperature （200-220℃） step. The structure of the final cured resin was related to the initial epoxy resin concentration of the blends.

关 键 词：双环戊二烯型氰酸酯树脂 环氧树脂 固化反应性 

分 类 号：TB332[一般工业技术—材料科学与工程]