Preparation of itaconic acid-modified epoxy resins and comparative study on the properties of it and epoxy acrylates

To investigate the potential applications of bio-based epoxy resins across diverse fields, this study synthesized a bio-based epoxy resin using itaconic acid (EIA) as the precursor material and compared its thermal, mechanical, and electrical properties with those of epoxy acrylate (EA). The findings indicate that the glass transition temperature and the 5% thermal decomposition temperature of the EIA-cured system are higher than those of EA. The breakdown field strength of the EIA-cured system is slightly higher than that of EA (35.58 kV/mm), suggesting that EIA exhibits stronger electrical properties compared to EA. Mechanical property tests demonstrate that the tensile strength, elongation at the fracture point, and Shore hardness of the EIA-cured system are superior to those of EA. In conclusion, EIA, serving as a matrix resin, is influenced by cross-linking density and intramolecular ester bonding and exhibits close electrical strength but superior mechanical, thermal, and degradation properties than EA.

为探究生物基环氧树脂在多领域的应用潜力，本研究以衣康酸（itaconic acid, EIA）为前驱体合成了一种生物基环氧树脂，并将其与环氧丙烯酸酯（epoxy acrylate, EA）的热学、力学及电学性能进行对比分析。研究结果表明，EIA固化体系的玻璃化转变温度与5%热分解温度均高于EA固化体系。EIA固化体系的击穿场强略高于EA固化体系（35.58 kV/mm），提示EIA的电学性能优于EA。力学性能测试结果显示，EIA固化体系的拉伸强度、断裂伸长率及邵氏硬度均优于EA固化体系。综上，作为基体树脂的EIA受交联密度与分子内酯键的影响，其电学性能与EA相当，但力学、热学及降解性能均优于EA。