Curing mechanism and kinetics of epoxy/anhydride system modified by benzoxazine

LIAO Jinbin; JIANG Qibin; ZENG Zhi; LI Hongyan

doi:10.3969/j.issn.0438-1157.2014.03.023

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Curing mechanism and kinetics of epoxy/anhydride system modified by benzoxazine

更新时间：2025-12-10

- Curing mechanism and kinetics of epoxy/anhydride system modified by benzoxazine
- CIESC Journal Issue 3, Pages: 929-933(2014)
- 作者机构：
  
  1. 株洲时代新材料科技股份有限公司,湖南,株洲,412007
  2. 湖南工业大学包装与材料工程学院,湖南,株洲,412007
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2014.03.023
  CLC： Q320.2
- Online First：05 March 2014，
  
  Published：05 March 2014
- 稿件说明：
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LIAO Jinbin, JIANG Qibin, ZENG Zhi, et al. Curing mechanism and kinetics of epoxy/anhydride system modified by benzoxazine[J]. CIESC Journal, 2014, (3): 929-933.
DOI：

LIAO Jinbin, JIANG Qibin, ZENG Zhi, et al. Curing mechanism and kinetics of epoxy/anhydride system modified by benzoxazine[J]. CIESC Journal, 2014, (3): 929-933. DOI： 10.3969/j.issn.0438-1157.2014.03.023.

摘要

利用一种二胺型苯并(口恶)嗪改性环氧酸酐体系。通过FT-IR和DSC分析了改性体系的固化机理。结果表明：共混树脂体系在固化时存在两个反应，首先是环氧树脂与足量的酸酐在咪唑作用下在100℃先开始固化，并在150℃固化2 h后固化完全，之后苯并(口恶)嗪在180℃发生开环聚合。用非等温DSC法研究了该共混体系的固化动力学。采用Flynn-Wall-Ozawa方法求出了共混体系在固化时两个固化反应的活化能，分别为65.27 kJ·mol-1和92.8 kJ·mol-1，并利用Friedman方法判断了两个反应都是自催化反应，计算得到自催化模型曲线与实验曲线能较好地吻合。

Abstract

An epoxy/anhydride system was modified by aromatic diamine-based benzoxazine. The curing mechanism of the system was analyzed with Fourier transform infrared spectroscopy(FT-IR)and differential scanning calorimetry (DSC). The blend system exhibited two curing reactions in the curing process. Epoxy resin first cured with sufficient anhydride catalyzed by imidazole at 100℃

and cured completely at 150℃ for 2 h. Benzoxazine underwent ring-opening polymerization at 180℃. The curing kinetics of modified resin system was studied with non-isothermal DSC at different heating rates. The average activation energies of two reactions were calculated utilizing the Flynn-Wall-Ozawa method to be 65.27 kJ·mol-1 and 92.8 kJ·mol-1

respectively. Both curing reactions were found to be autocatalytic processes by the Friedman method

and the predicted curves from the autocatalytic model fitted well with those of experiments.

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