摘要
用含双烯体结构的呋喃甲胺,将硬段为双酚A型E-51环氧树脂(EP)和软段为PEGDE连接成线性大分子,并与含亲双烯体结构的双马来酰亚胺反应,制备出含热可逆Diels-Alder(DA)反应的软-硬-软结构的本征型自修复环氧树脂(EP-DA)。通过FTIR、DSC、TGA和电子万能试验机,对EP-DA结构和性能进行了表征。结果表明:DA动态共价键成功引入EP-DA,且DA正、逆反应的温度分别是60℃、122℃。当EP-DA链段中的PEGDE和EP含量各占50%时,其耐热性和拉伸强度达到最佳。EP-DA还具有良好的再加工性能和多次自修复性能,受损试样在60℃下修复4 h后,裂纹基本愈合,且第一次修复率可达88.41%,同一试样经过三次修复后,其修复率仍可达68%以上。
The dienyl structure-containing furan methylamine was used to link the hard segment E-51 epoxy resin(EP)modified by bisphenol A and the soft segment PEGDE to form linear macromolecules,and reacted with bismaleimide containing dienophilic structure to synthesize the soft-hard-soft structure of the intrinsic self-healing epoxy(EP-DA)via thermo reversible Diels-Alder(DA)reaction.The structure and performance of EP-DA were characterized by FTIR,DSC,TGA and electronic universal testing machine.The results show that:DA dynamic covalent bond is successfully introduced into EP-DA,and the temperature of DA forward and reverse reaction is 60℃and 122℃respectively.When the PEGDE and EP content in the EP-DA segment each accounts for 50%,its heat resistance and tensile strength reach the best,the epoxy resin exhibits good reprocessing properties and multiple self-repairing properties.After the damaged specimen is repaired at 60℃for 4 h,the crack is healed,and the first repair rate is 88.41%.After three repairs of the same specimen,the repair rate is still more than 68%.
作者
张伦亮
万里鹰
黄军同
李喜宝
冯志军
陈智
ZHANG Lunliang;WAN Liying;HUANG Juntong;LI Xibao;FENG Zhijun;CHEN Zhi(School of Materials Science and Engineering,Nanchang Hangkong University,Nanchang 330063,Jiangxi,China)
出处
《化工学报》
EI
CAS
CSCD
北大核心
2020年第6期2871-2879,共9页
CIESC Journal
基金
国家自然科学基金项目(51463016)
中国博士后面上基金项目(2019M662860)
上海航天科技创新基金项目(SAST2016053)。
