环氧树脂(EP)具有优异的力学性能、耐热性、化学稳定性以及低固化收缩率,广泛应用于涂料、粘接剂、电子电器、复合材料等领域.然而由于 EP 固化后交联密度高,导致其固化物内应力大、质脆且耐冲击性差,限制了其在高抗冲和高抗断裂等领域的应用与发展.提高 EP 的韧性一直是该领域的研究热点也是难点.本研究综述了近年来国内外EP增韧改性的研究进展,包括橡胶、热塑性树脂、超支化聚合物、热致性液晶聚合物、核壳聚合物、无机纳米粒子等增韧方法,分析了其增韧机理,并对未来EP增韧技术发展方向进行了展望.
Research Progress of Toughening Modification of Epoxy Resin
Epoxy resin(EP)has excellent mechanical properties,heat resistance,chemical stability and low curing shrinkage,which is widely used in coatings,adhesives,electronics,composite materials and other fields.However,the cured EP exhibits large internal stress,brittleness and poor impact resistance due to the high cross-linking density,which limits its application and development in the fields of high impact and fracture resistance.Toughening EP has always been a focus and difficulty.In this study,the research progress of EP toughening modification at home and abroad in recent years was reviewed,including rubbers,thermoplastics,hyperbranched polymers,liquid crystal polymers,core-shell polymers,inorganic nanoparticles and other toughening methods,and the toughening mechanism was analyzed.Furthermore,the future development direction of EP toughening technology was prospected.
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