香兰素基环氧树脂的制备及性能研究  

Preparation and properties of vanillin-based epoxy resin

作　　者：金川 赵思 杭翔 黄艳芬 吕早生 Jin Chuan;Zhao Si;Hang Xiang;Huang Yanfen;Lv Zaosheng(School of Chemistry and Chemical Engineering,Wuhan University of Science and Technology,Wuhan 430081)

机构地区：[1]武汉科技大学化学与化工学院,武汉430081

出　　处：《化工新型材料》2024年第3期262-266,272,共6页New Chemical Materials

基　　金：湖北省重点实验室基金(WKDM202105)。

摘　　要：以香兰素(VAN)改性4,4-二氨基二苯甲烷(DDM),经脱水缩合反应,合成香兰素希夫碱固化剂(VDM)。在催化剂2-乙基-4-甲基咪唑(EMI)作用下,采用VDM固化双酚A型环氧树脂(E44)。交联后的环氧树脂(E44-VDM)表现出优异的拉伸强度(60MPa)、拉伸断裂率(8.2%)和玻璃化转变温度(109℃)。在高温下,基于亚胺键的交换反应,E44-VDM表现出再加工性、快速的应力松弛和形变恢复行为,根据阿伦尼乌斯(Arrhenius)定律,计算出亚胺键交换活化能为65.15kJ/mol。将E44-VDM分别浸没在酸碱溶液中,经过72h处理后,并未溶解或溶胀,仍能保持结构完整性,显示出优异的耐酸碱性。尽管经再加工的E44-VDM力学性能不可避免地低于原始试样,但VDM可应用于多种环氧树脂体系中,可为缓解环境污染和资源消耗提供解决方案。4,4-diamino-diphenyl methane(DDM)was modified by vanillin(VAN),and the vanillin Schiff base curing agent(VDM)was synthesized by dehydration condensation reaction.The bisphenol A epoxy resin(E44)was cured by VDM in the presence of 2-ethyl-4-methylimidazole(EMI)catalyst.The crosslinked epoxy resin(E44-VDM)showed excellent tensile strength(60MPa),tensile fracture rate(8.2%),and glass transition temperature(109℃).At high temperature,based on the exchange reaction of imine bonds,E44-VDM exhibited reprocessability,rapid stress relaxation and deformation recovery behavior.The activation energy of imine bond exchange was calculated to be 65.15kJ/mol by Arrhenius law.E44-VDM was immersed in acid and alkali solutions for 72 h respectively,it was not dissolved or swollen,and still remained in structural integrity,demonstrating excellent acid and alkali resistance.The mechanical properties of the reprocessed E44-VDM were inevitably weaker than the original samples,however,VDM could be applied in a variety of epoxy resin systems,providing a solution to mitigate environmental pollution and resource consumption.

关 键 词：环氧树脂 希夫碱 生物基固化剂 再加工性 

分 类 号：TQ323.5[化学工程—合成树脂塑料工业]