环氧树脂与氰酸酯共固化反应的研究

A STUDY OF CO-CURING OF EPOXY AND CYANATE RESIN

应用DSC、FT IR对乙酰丙酮过渡金属络合物催化促进的环氧树酯与氰酸酯共固化反应行为、历程以及固化物的结构特征进行了研究探讨 .结果表明 ,促进剂能够明显的降低固化反应温度 ,缩短固化反应时间 .反应历程首先是氰酸酯发生自聚反应形成二聚体或三聚体 (三嗪环 ) ,然后二聚体可进一步共聚形成三嗪环 ,此过程伴随着环氧基的聚醚反应 ,最后是三嗪环与剩余的环氧基反应形成唑烷酮 .在氰酸酯欠量的条件下 ,固化树脂中主要是唑烷酮和聚醚结构 ,三嗪环结构很少 ;在氰酸脂适量或过量条件下 ,固化树脂主要是三嗪环和唑烷酮结构 ,聚醚结构很少 .

The influence of a transition metal acetylacetone catalyst on the behavior, mechanism and product structure of the co\|curing of epoxy and cyanate was studied by DSC and FT\|IR. The results reveal that the catalyst can accelerate the curing of the resins decreasing the curing temperature and time. The reactions involved in the co\|curing are: cyclodimerization and cyclotrimerization of cyanates, polyetherfication of epoxy groups and cyclotrimerization of cyclic dimers, as well as the formation of oxazolidinone rings. In the lack of cyanate functional groups, the main structures of cured compounds are oxazolidinone and polyether structure in the cured resin, and the triazine ring structure is of minor importance. In the excess of cyanate functional groups, the main structures are triazine ring and oxazolidinone structures in the cured resin, and the polyether structure is of minor importance.