ABSTRACT

Based on its excellent damping properties, traditional rubberhas been widely used in various industries, includingaerospace, rail transit and automotive.However, the disadvantages of effective damping area, unstable damping performance, easy fatigue and aging, greatly limited the further application of rubber materials. Thus, it is important to develop novel modifiedrubber damping materials. Herein, polyamidoamine dendrimers with terminal modified phenolic hydroxyl and amine groups (G2 PAMAM-H) were designed and used as modifiers to improve the damping performance of chlorinated butyl rubber (CIIR). The results showed thatthe modification of G2 PAMAM by diphenolic acid can avoid its aggregation in the CIIR matrix. CIIR/G2 PAMAM-H nanocomposites exhibited high tan δ _max of 1.52 and wide damping temperature region of 140 °C (tan δ >0.55)at a very low loading (4.32 wt.%), which were strongerthan that of pure CIIR and CIIR/G2 PAMAM nanocomposites. In addition, these nanocomposites also exhibited a unique self-healing ability by multiple hydrogen bonds, which can effectively extend the life of the rubber material in actual production. Therefore, the dendrimer modification provided unique development opportunities for elastomers in certain highly engineered fields, such as vehicles, rail transit, aerospace, etc.

摘要

传统的橡胶由于其优异的阻尼性能而被广泛应用于航空航天，轨道交通和汽车等各个行业，但是有效阻尼面积大，阻尼性能不稳定，易疲劳和老化等缺点极大地限制了橡胶材料的进一步应用。因此，重要的是开发新颖的改性橡胶阻尼材料。本文中，设计了具有末端改性酚羟基和胺基的聚酰胺型胺树枝状聚合物（G2 PAMAM-H），并用作改性剂以提高氯化丁基橡胶（CIIR）的阻尼性能。结果表明，双酚酸修饰G2 PAMAM可以避免其在CIIR基质中的聚集。CIIR / G2 PAMAM-H纳米复合材料显示出高的黄褐色δ _最大的1.52和宽阻尼的140°C（黄褐色温度区域δ在非常低的负载量（4.32重量％），这是纯CIIR和CIIR / G2 PAMAM纳米复合材料的strongerthan> 0.55）。另外，这些纳米复合材料还通过多个氢键表现出独特的自修复能力，可以有效延长橡胶材料在实际生产中的寿命。因此，树枝状聚合物的改性为某些高工程领域的弹性体提供了独特的开发机会，例如车辆，轨道交通，航空航天等。