摘要
以香草醛、4-氨基苯酚和环氧氯丙烷为主要原料,合成一种含有动态亚胺结构的生物基环氧单体(VAE);用香草醛改性4,4′-联苯胺,经脱水缩合反应得到具有联苯介晶单元的生物基固化剂(VB)。基于VAE和VB的固化反应合成一种本征导热可回收环氧树脂(CBV)。对树脂的网络结构、导热性能、可回收利用及降解性能进行研究,结果表明:由于存在高度有序的微观结构,CBV具有较高的各向同性本征热导率(0.31 W/(m·K))。高浓度的席夫碱和刚性芳香族结构使CBV具有较高的玻璃化转变温度(165.8℃)和拉伸强度(63.5 MPa)。高温下基于亚胺键的交换反应,CBV表现出可再加工性。重塑成型后的树脂拉伸强度保持率约为85%,热性能保持率高达90%。此外,CBV树脂可通过胺类溶剂热溶解法实现完全降解。
A bio-based epoxy monomer VAE containing dynamic imine structure was synthesized from vanillin,4-aminophenol and epichlorohydrin.A biobase curing agent VB with biphenyl mesocrystalline unit was synthesized by dehydration condensation of 4,4′-benzidine(BP)modified by vanillin.A novel intrinsically thermally conductive recyclable epoxy resin CBV was synthesized based on the curing reaction.The network structure,thermal conductivity,recyclability and degradation performance of the resin were studied.The results show that CBV has a high isotropic intrinsic thermal conductivity(0.31 W/(m·K))due to the existence of highly ordered microstructure.The high concentration of Schiff base and the rigid aromatic structure give it a high glass transition temperature(165.8℃)and tensile strength(63.5 MPa).At high temperatures,CBV shows reprocessability based on the exchange reaction of imine bonds.The mechanical strength retention rate of the resin after reshaping is about 85%,and the thermal property retention rate is as high as 90%.In addition,CBV resin can be completely degraded by amine solvothermal dissolution.
作者
汪名艳
秦佳欣
刘万双
WANG Mingyan;QIN Jiaxin;LIU Wanshuang(College of Materials Science and Engineering,Donghua University,Shanghai,China;College of Textiles,Donghua University,Shanghai,China;Center for Civil Aviation Composites,Donghua University,Shanghai,China)
出处
《东华大学学报(自然科学版)》
北大核心
2025年第2期64-69,共6页
Journal of Donghua University(Natural Science)
关键词
环氧树脂
本征导热
香草醛基
生物基
亚胺交换
重塑成型
可降解
epoxy resin
intrinsic thermal conductivity
vanillaldehyde group
biobase
imine exchange
remolding
degradation
