【摘要】 合成了既含聚乙二醇醚（ＰＥＧ）柔性链、又含刚性液晶结构单元的活性增韧促进剂（ＬＣＥＵＰＥＧ），对其促进环氧树脂／双氰双胺体系的固化反应活性、反应机制；增韧剂的用量与动态力学性能、冲击性能之间的关系进行了研究．结果表明：ＬＣＥＵＰＥＧ对Ｅ－５１／ｄｉｃｙ固化体系具有明显的促进作用，能有效的降低固化反应活化能及固化反应温度；改性体系的冲击强度较单纯的Ｅ－５１／ｄｉｃｙ体系提高３～７倍；模量较未增韧体系有所提高．更多还原

【Abstract】 A series of reactive toughening accelerators(LCEU PEG ) containing both the flexible chain and rigid chain liquid crystal unit were synthesized and used to toughen the epoxy resin/dicyandiamide curing system. The curing reactivity, relationships of dynamic mechanical properties and impact strengths with the amount of LCEU PEG of the modified systems were investigated. The results showed that impact strength of the modified systems was enhanced for 3￣7 times compared with the unmodified system, the modulus of the modified systems were also higher than that of the unmodified curing system.更多还原