自固化生物基环氧树脂分子结构设计及性能

Molecular structure design and properties of self-curing bio-based epoxy resin

以丁香酚和戊二酰氯为原料,设计并制备了具有自固化特性的生物质环氧树脂(EPEUGL)。对EPEUGL的自固化机理和固化特性、固化物C-EPEUGL的热性能、热机械性能、热稳定性能、介电性能和微观形貌结构进行了系统的研究。研究结果表明:EPEUGL中的环氧基团和活性酯基团之间有较高的选择性和反应活性,C-EPEUGL的玻璃化转变温度(T_(gDMA))为94.6℃,C-EPEUGL的E'(25℃)为2104 MPa;C-EPEUGL表现出优异的耐热性能,直至284.9℃没有明显的分解。此外,由于羟基参与交联反应,大幅度降低交联网络的极性,C-EPEUGL的介电常数(Dk)为3.10(1 GHz),明显低于传统的环氧-胺的体系,并且C-EPEUGL的断面表现出具有韧性断面特征的“锯齿”状。合成的自固化生物基环氧树脂的综合性能优异,包括高耐热性、高模量、良好的热稳定性和低的Dk,在电子通信等领域具有潜在的应用价值。

Biomass-based epoxy resin(EPEUGL)with self-curing properties was designed and prepared from eugenol and glutaryl chloride.The self-curing mechanism and curing characteristics of EPEUGL,the thermal properties,thermomechanical properties,thermal stability,dielectric properties,and microstructure morphology of cured product C-EPEUGL were systematically studied.The research results showed that there was high selectivity and reactivity between the epoxy group and active ester group in EPEUGL,the glass transition temperature(T_(gDMA))of C-EPEUGL was 94.6℃and the E'(25℃)of C-EPEUGL was 2104 MPa.C-EPEUGL exhibited excellent heat resistance and did not decompose obviously until 284.9℃.In addition,due to the participation of hydroxyl groups in the crosslinking reaction,the polarity of crosslinked network was greatly reduced,and the dielectric constant(Dk)of C-EPEUGL was 3.10(1 GHz),which was significantly lower than that of the conventional epoxy-amine system,and the cross-section of C-EPEUGL exhibited a"sawtooth"shape with the characteristics of a ductile crosssection.The synthesized self-curing bio-based epoxy resin had excellent comprehensive performance,including high heat resistance,high modulus,good thermal stability and low Dk,which had potential applications in the fields such as electronic communication.