摘要
本文应用ＤＳＣ和ＦＴＩＲ对２－乙基－４－甲基咪唑固化双酚Ａ二缩水甘油醚型环氧树脂体系的固化反应机理和２－乙基－４－甲基咪唑固化双酚Ａ二缩水甘油醚型、缩水甘油酯与脂环型环氧树脂体系的固化反应特征、动力学及其反应活性进行了研究．结果表明，双酚Ａ二缩水甘油醚型环氧树脂／咪唑体系的固化反应是分两步独立进行的，第一步是加成反应，第二步是催化聚合反应．缩水甘油酯与脂环型环氧树脂（ＴＤＥ－８５）／咪唑体系的固化反应过程也分两步进行，第一阶段反应主要是缩水甘油酯型环氧基进行的加成反应和催化聚合反应，第二阶段主要是脂环型环氧基进行的加成反应．各体系第一阶段的表现反应活化能均低于第二阶段活化能．当ＴＤＥ－８５型环氧树脂中引入缩水甘油醚型环氧树脂后，固化反应速率均较ＴＤＥ－８５环氧树脂单独固化时快．
The curing meChanism of bisphenol-A diglycidyl ether type epoxy resin(DGEBA ) cured with 2- ethyl-4- methylimidazole(EMI- 2,4 ),and the curing charac teristics,kinetic and reactivities of DGEBA, diglycidyl ester and aliphatic cyclotype epoxy resin (TDE-85) cured with EMI-2,4 have ho studied by DSC,FTIR in this paper The results of DGEBA cured with EMI-2,4 show that thewhole curing mechanism can be Separated into tWo Stages. The first stage was addi non,the second stage was catalyhc-polylnerizahon.The whole curing of TDE-85epoxy resin CUred with EMI-2,4 proceed in two stages as well.The first stagemainly was addition and catalyhc-polymerizahon of diglyddyl ester type epoxygroup,the second stage mainly was addition of aliphatic cyclo epoxy group.Theapparent activation energy in the first stage of various epoxy resin cured system islower than that in the second stage.It was found that in the co-curing systems ofreactivity of TDE-85 with DGEBA type proxy aden CUred with EMI-2,4 is higherthan that of TDE-85 epoxy resin.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
1994年第6期641-646,共6页
Acta Polymerica Sinica
关键词
甲基咪唑
环氧树脂
固化反应
动力学
反应活性
Epoxy Resin, 2- Ethyl- 4- Methylimidazole, Curing,Kinetic, CuringMechanism
