天然橡胶/杜仲胶复合材料的制备及其阻尼性能研究

在天然橡胶(NR)中引入杜仲胶(EUG),以环氧化天然橡胶(ENR)/受阻酚AO-80(质量比为25∶20)为阻尼相，制备了NR/EUG/ENR/AO-80复合材料，并测定了复合材料的硫化特性、力学性能、结晶性能与动态力学性能。结果表明：复合材料在常温范围内具有较高的损耗因子与较宽的阻尼温域，当NR与EUG的质量比为60∶40时复合材料具有最大的损耗因子峰值，并且随着EUG含量的增加，总体上复合材料在常温范围内的储能模量逐渐增大；复合材料的玻璃化转变温度出现在-60℃附近，并且随着EUG含量的增加，复合材料开始出现EUG结晶的熔融峰，结晶度和熔融温度逐渐增大。扫描电子显微镜(SEM)测试结果表明复合材料的断面较为平整，ENR改善了两相的相容性；透射电子显微镜(TEM)测试结果表明NR与EUG两相之间具有明显的分界。复合材料在低应变下表现出高柔性的特点，同时具有较高的拉伸强度和拉断伸长率。

Preparation and damping properties of natural rubber/Eucommia ulmoides gum composites

NR/EUG/ENR/AO-80 composites have been prepared by introducing Eucommia ulmoides gum (EUG) into natural rubber (NR) and using epoxidized natural rubber (ENR)/hindered phenol AO-80 (mass ratio of 25:20) as the damping phase. The vulcanization characteristics, mechanical properties, crystallization properties and dynamic mechanical properties of the composites were measured. The results show that the composites have a high loss factor in the normal temperature range and a wide damping temperature range. The composite showed the maximum loss factor peak when the mass ratio of NR to EUG was 60:40. The storage modulus of the composites in the normal temperature range increased gradually with increasing EUG content. The glass transition temperature of the composites appeared near -60 ℃. With the increasing EUG content, the melting peak of EUG crystals began to appear in the composites, and the crystallinity and melting temperature gradually increased. Scanning electron microscopy (SEM) showed that the cross-section of the composite was relatively flat, and that ENR improved the compatibility of the two phases. Transmission electron microscopy (TEM) showed that there was a clear boundary between NR and EUG phases. The composites exhibit high flexibility under low strain, and have high tensile strength and elongation at break.