环氧树脂具有优异的力学性能和粘接性能,然而其存在质脆、韧性差、固化时产生内应力等缺点,需要通过改性来拓展其应用领域.介绍了聚氨酯改性增韧、热致型液晶高分子改性增韧环氧树脂的最新研究进展,并展望了其发展前景.聚氨酯具有高弹性、耐磨、抗撕裂等特点,与环氧树脂相容性好;热致型液晶高分子改性环氧树脂固化体系既融合了液晶的有序性又保留了环氧树脂网络交联的特点,其韧性、冲击强度大幅度提高,而耐热性不降低.利用聚氨酯、热致型液晶高分子改性环氧树脂能显著提高其力学性能,实现其在众多领域的应用.
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