新型高冲击韧性环氧乙烯基酯树脂的合成和表征

通过引入柔性环氧封端聚醚(ETPE)单体, 报道了一种温和且高效制备新型高冲击韧性的乙烯基酯树脂(EVER-2)的方法。 用傅里叶变换红外光谱(FTIR)、核磁共振氢谱(¹H NMR)和碳谱(¹³C NMR)等技术手段对其结构进行了表征, 并对其拉伸强度、弯曲强度和冲击韧性等力学性能和热变形温度进行了测试。 结果表明, 只需少量的ETPE参与反应(约占树脂总质量的7.9%), EVER-2固化产物就具有很高的冲击韧性。 其SEM的冲击断面形貌表明, 新型高冲击韧性乙烯基酯树脂为均相结构, 其与玻璃纤维有很好的粘结能力。 提出了EVER-2及其与玻璃纤维复合材料 EVERL-2可能的增韧机理。

Synthesis and Characterization of Novel High Impact Strength Epoxy Vinyl Ester Resin

With the introduction of flexible epoxy-terminated polyether(ETPE) as the monomer, herein, we reported a facile and efficient synthesis approach for novel epoxy vinyl ester resin(EVER-2) with high impact toughness. The resin was analyzed by Fourier-transform infrared(FTIR), ¹H nuclear magnetic resonance(¹H NMR) and ¹³C nuclear magnetic resonance(¹³C NMR) spectroscopy. Mechanical properties such as tensile strength, flexural strength, impact strength and heat distortion temperature were also determined for EVER-2. The cured resin containing 7.9% mass fraction of ETPE has outstanding performance on impact strength. SEM (scanning electron microscopy) analysis reveals that EVER-2 matrix displays a single-phase morphology and its galss fiber/EVER-2 composite(EVERL-2) exhibits better bonding between the matrix and glass fiber, which means that EVERL-2 can bear more impact strength than galss fiber/ EVER-1 composite(EVERL-1). Moreover, plausible toughening mechanisms of EVER-2 and EVERL-2 were proposed.