CURING MECHANISM, KINETIC, REACTIVITIES OF EPOXY RESINS SYSTEM CURED WITH 2-ETHYL-4-METHYLIMIDAZOLE

CHEN Ping; LIU Li-zhu

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CURING MECHANISM, KINETIC, REACTIVITIES OF EPOXY RESINS SYSTEM CURED WITH 2-ETHYL-4-METHYLIMIDAZOLE

Research Article | 更新时间：2021-03-19

- CURING MECHANISM, KINETIC, REACTIVITIES OF EPOXY RESINS SYSTEM CURED WITH 2-ETHYL-4-METHYLIMIDAZOLE
- Acta Polymerica Sinica Issue 6, Pages: 641-646(1994)
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- Published：20 December 1994，
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CHEN Ping, LIU Li-zhu. CURING MECHANISM, KINETIC, REACTIVITIES OF EPOXY RESINS SYSTEM CURED WITH 2-ETHYL-4-METHYLIMIDAZOLE. [J]. Acta Polymerica Sinica (6):641-646(1994)
DOI：

CHEN Ping, LIU Li-zhu. CURING MECHANISM, KINETIC, REACTIVITIES OF EPOXY RESINS SYSTEM CURED WITH 2-ETHYL-4-METHYLIMIDAZOLE. [J]. Acta Polymerica Sinica (6):641-646(1994) DOI：

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．

Abstract

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，diglyddyl ester and aliphatic cyclo type epoxy resin (TDE-85) cured with EMI-2，4 have been studied bv DSC，FTIR in this paper．The results of DGEBA cured with EMI-2，4 show that the whole curing mechanism can be separated into two stages．The first stage was addi-tion，the second stage was catalytic-polymerization．The whole curing of TDE-85 epoxy resin cured with EMI-2，4 proceed in two stages as well．The first stage mainly was addition and catalytic-polymerization of diglycidyl ester type epoxy group，the second stage mainly was addition of aliphatic cydo epoxy group．The apparent activation energy in the first stage of various epoxy resin cured system is lower than that in the second stage．It was found that in the co-curing system of reactivity of TDE-85 with DGEBA tVpe eooxy resin cured with EMI-2，4 is higher than that of TDE-85 epoxy resin．

关键词

环氧树脂2－乙基－4－甲基咪唑固化反应动力学反应机理

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