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Fabrication and curing properties of o-cresol formaldehyde epoxy resin with reversible cross-links by dynamic boronic ester bonds
Polymer ( IF 4.6 ) Pub Date : 2020-10-06 , DOI: 10.1016/j.polymer.2020.123116
Yanning Zeng , Shuxin Liu , Xinmeng Xu , Yang Chen , Faai Zhang

Conventional cured o-Cresol Formaldehyde Epoxy Resin (o-CFER) with permanent crosslink network is relatively stiff, brittle, and unrecyclable. In order to overcome these defects, herein 2,2′-(1,4-phenylene)-bis [4-mercaptan-1,3,2- dioxaborolane] (BDB) is employed as curing agent and a novel type of covalent adaptable network o-CFER is constructed by the reaction between thiols in BDB and epoxy groups in o-CFER. Obtained curing o-CFER vitrimers possess superior thermostability and good mechanical properties. Because of the transesterification of boronic ester bonds, o-CFER network topologies can be altered, contributing a self-healing ability and shape memory to the produced polymer. Besides, it is investigated the effects of the healing time and temperature on self-healing capability and achieved a healing efficiency of above 95% at 160 °C for 12 h. Moreover, through hot press, the pulverized samples of 8%C-o-CFER can be reshaped several times and mechanical properties of the recycled samples are well-restored even higher than those of pristine after being remolded at 200 °C for 60 min.



中文翻译:

动态硼酸酯键可逆交联的邻甲酚甲醛环氧树脂的制备及固化性能

常规固化ø甲酚醛环氧树脂(ö -CFER)具有永久交联网络相对变硬,变脆,和不可回收。为了克服这些缺陷,本文将2,2'-(1,4-亚苯基)-双[4-巯基-1,3,2-二氧杂硼环烷](BDB)用作固化剂,并采用了新型的共价适应性o- CFER网络是通过BDB中的硫醇与o- CFER中的环氧基之间的反应构建的。所获得的固化的o- CFER triomer具有优异的热稳定性和良好的机械性能。由于硼酸酯键的酯交换的,ö-CFER网络拓扑可以更改,为所生产的聚合物提供自我修复能力和形状记忆。此外,还研究了愈合时间和温度对自愈能力的影响,并在160°C下持续12 h达到了95%以上的愈合效率。另外,通过热压,将粉碎的8%C-样品ø -CFER可重塑再循环样品的几次和机械性能是在200℃下被重塑60分钟后甚至高于原始的良好恢复。

更新日期:2020-10-11
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