不同长度脂肪链对含萘环结构环氧树脂的固化动力学的影响研究  

Influence of Different Length of Aliphatic Chain in the Epoxy Resin Containing Naphthalene Structure on the Curing Reaction

作　　者：郑寅[1,2] 石震[1] 宋新建[2] 王军刚[1] 

机构地区：[1]湖北民族学院化学与环境工程学院,恩施445000 [2]湖北民族学院生物资源保护与利用湖北省重点实验室,恩施445000

出　　处：《材料导报》2016年第12期70-75,共6页Materials Reports

基　　金：湖北省自然科学青年基金(2014CFB621);湖北民族学院博士科研启动基金(MY2013B027)

摘　　要：为了研究环氧树脂的不同长度脂肪链结构因素对其固化动力学和固化物性质的影响,合成了两种以萘环结构为分子骨架,以酯键链接两条对称的柔性脂肪链结构的环氧树脂,并通过核磁共振氢谱(1 H NMR)和元素分析(EA)对其结构进行了表征。以DDM为固化剂通过Ozawa法计算出R1/DDM和R2/DDM固化体系的反应活化能Ea分别42.34kJ/mol和56.88kJ/mol,并且发现具有长链结构的R1对固化反应有一定的阻碍作用,而短链结构的R2对固化体系有一定的自催化作用。对固化物的热稳定性、玻璃化转变温度(Tg)、拉伸强度、弯曲强度和吸水率进行了测试,研究了它们之间的构效关系。研究结果表明随着环氧树脂脂肪链长度的增加,其固化物的耐热性、玻璃化转变温度和吸水性下降,而力学性能得到了提高。In order to understand the effect of the varying the chain length of the initial resin chemistry on curing kinetics and the final properties of the cured products,two resins both contained naphthalene units and two symmetric flexible aliphatic ester chains terminated were synthesized and characterized by means of 1 H NMR and EA.Both epoxy resins were cured with 4,4′-diaminodiphenylmethane（DDM）and their kinetic analysis were performed by Ozawa′s isoconversional method.The activation energy（Ea）of R1/DDM and R2/DDM curing system was 42.34kJ/mol and 56.88kJ/mol.The results indicated that the resin of long chain（R1）could delay the curing reaction while the resin of short chain（R2）could accelerate the curing reaction.The thermal properties,Tg,tensile strength,flexural strength and moisture absorption of the cured epoxy resins were investigated and the relationship between the chemical structure and properties of the cured resins were systematically researched.The results showed that the heat resistance,glass transition temperature and water absorption decreased with the increase of the length of the epoxy resin,and the mechanical properties were improved.

关 键 词：萘环 环氧树脂 固化动力学 构效关系 

分 类 号：TQ322.4[化学工程—合成树脂塑料工业]