Lei Tuo, Zhang Yong-Wang, Kuang Dong-Liang, Yang Yong-Rui
School of Civil Engineering, Chang'an University, Xi'an 710061, China.
School of Civil Engineering, Southeast University, Nanjing 210096, China.
Polymers (Basel). 2019 Aug 20;11(8):1374. doi: 10.3390/polym11081374.
To improve the energy dissipation capacity of rubber isolation bearings, it is important to find a new rubber material with good applicability and high damping properties. Two types of blends were prepared using nitrile rubber (NBR), brominated butyl rubber (BIIR) and ethylene-vinyl acetate copolymer (EVA): NBR/BIIR and NBR/BIIR/EVA. The vulcanization, mechanical and damping properties of the blends were analyzed. The results show that both blends exhibit excellent vulcanization plateaus and mechanical properties. For NBR/BIIR, as the BIIR content increases, the complementary effects of NBR and BIIR afforded by blending are enhanced. Two damping peaks appeared in the tanδ-T curve and shifted toward lower and higher temperatures, respectively, which clearly widened the effective damping temperature range. However, the damping value in the valley of the tanδ-T curve was as low as 0.39. For NBR/BIIR/EVA, the addition of EVA greatly increased damping in the valley of the tanδ-T curve to approximately 0.54. EVA was observed to be the optimal polymer for improving the compatibility of the NBR/BIIR blend. Moreover, hot air thermal aging tests showed that both blends demonstrated good stability.
为提高橡胶隔震支座的耗能能力，找到一种适用性好且阻尼性能高的新型橡胶材料至关重要。使用丁腈橡胶（NBR）、溴化丁基橡胶（BIIR）和乙烯-醋酸乙烯酯共聚物（EVA）制备了两种共混物：NBR/BIIR和NBR/BIIR/EVA。对共混物的硫化、力学和阻尼性能进行了分析。结果表明，两种共混物均表现出优异的硫化平台和力学性能。对于NBR/BIIR，随着BIIR含量的增加，共混产生的NBR和BIIR的互补效应增强。在tanδ-T曲线中出现了两个阻尼峰，分别向较低和较高温度移动，这明显拓宽了有效阻尼温度范围。然而，tanδ-T曲线谷底的阻尼值低至0.39。对于NBR/BIIR/EVA，EVA的加入使tanδ-T曲线谷底的阻尼大大增加至约0.54。观察到EVA是改善NBR/BIIR共混物相容性的最佳聚合物。此外，热空气热老化试验表明，两种共混物均表现出良好的稳定性。
