STUDY ON PROPERTIES OF EPOXY RESIN TOUGHENED BY A FUNCTIONAL MESOMORPHIC POLYMER ——CURING REACTIVITY AND DYNAMIC MECHANICAL PROPERTIES

ZHANG Baolong; TANG Guangliang; YOU Yingcai; SHI Keyu; DU Zhongjie; HUANG Jifu

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STUDY ON PROPERTIES OF EPOXY RESIN TOUGHENED BY A FUNCTIONAL MESOMORPHIC POLYMER ——CURING REACTIVITY AND DYNAMIC MECHANICAL PROPERTIES

Research Article | 更新时间：2021-03-19

- STUDY ON PROPERTIES OF EPOXY RESIN TOUGHENED BY A FUNCTIONAL MESOMORPHIC POLYMER ——CURING REACTIVITY AND DYNAMIC MECHANICAL PROPERTIES
- Acta Polymerica Sinica Issue 5, Pages: 573-579(1998)
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- Published：20 October 1998，
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ZHANG Baolong, TANG Guangliang, YOU Yingcai, SHI Keyu, DU Zhongjie, HUANG Jifu. STUDY ON PROPERTIES OF EPOXY RESIN TOUGHENED BY A FUNCTIONAL MESOMORPHIC POLYMER ——CURING REACTIVITY AND DYNAMIC MECHANICAL PROPERTIES. [J]. Acta Polymerica Sinica (5):573-579(1998)
DOI：

ZHANG Baolong, TANG Guangliang, YOU Yingcai, SHI Keyu, DU Zhongjie, HUANG Jifu. STUDY ON PROPERTIES OF EPOXY RESIN TOUGHENED BY A FUNCTIONAL MESOMORPHIC POLYMER ——CURING REACTIVITY AND DYNAMIC MECHANICAL PROPERTIES. [J]. Acta Polymerica Sinica (5):573-579(1998) DOI：

摘要

合成了一系列既含环氧丙烷聚醚（ＰＰＧ）柔性间隔基、又含刚性介晶结构单元的端脲基活性改性剂（ＬＣＥＵＰＰＧ）

并对其改性环氧树脂Ｅ-５１／双氰双胺（Ｅ-５１／ｄｉｃｙ）体系的固化反应活性、改性剂含量对增韧体系动态力学性能及冲击性能的影响进行了研究．结果表明：ＬＣＥＵＰＰＧ的加入对固化体系具有明显的增韧作用

冲击强度提高了３～７倍；其对Ｅ-５１／ｄｉｃｙ固化反应具有明显的促进作用

可使固化反应表观活化能（Ｅａ）降低５０～７０ＫＪ／ｍｏｌ、固化温度降低３０～４０℃；体系的玻璃化转变温度（Ｔｇ）略有下降

但模量基本不降低或略有升高；β-转变向低温方向移动．

Abstract

A series of toughening agents(LCEU-PPG) containing the polypropylene glycol(PPG) flexible space

mesomorphic unit

and reactive urea terminated group were synthesized and used to modify the epoxy resin E51/dicyandiamine(E51/dicy) curing system.The curing reactivity

dynamic mechanical behavior

and impact strength of the modified curing systems were investigated.The results show that the addition of LCEU PPG has improved the impact strength for 3～7 times;has accelerated the curing reaction apparently

leading to the reduction of apparent curing reaction energy (Ea) by 50～70KJ/mol and the fall of curing reaction temperature by 30～40℃.Elastic modulus are almost equal to or higher than that of the unmodified system

although Tg is slightly decreased and β-transition temperature is shifted to a lower temoerature.

关键词

环氧树脂增韧反应活性动态力学行为

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中国科学院广州化学研究所

中国科学院研究生院

Beijing National Laboratory for Molecular Sciences,Key Laboratory of Polymer Chemistry and Physics of Ministry of Education,College of Chemistry and Molecular Engineering,Peking University

北京分子科学国家实验室高分子化学与物理教育部重点实验室北京大学化学与分子工程学院

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