Aiming at enhancing the damping and sound absorption performances of nitrile rubber (NBR) incorporated Eucommia ulmoides gum (EUG), a series of NBR/EUG composites were successfully fabricated using an open mixing mill. The co-vulcanization behaviors, fracture surface morphology observations, mechanical and thermal properties and damping and sound absorption performances of NBR/EUG composites were investigated systematically. It was shown that the crystalline area and the amorphous area in NBR/EUG composites displayed a sea-island phase distribution and most of the EUG crystals were β-form crystals. Compared to that of neat NBR, the tensile strength and storage modulus of NBR/EUG composites increased dramatically with the increasing EUG content, owing to the gradually increasing number of crystals in the NBR/EUG composites. In addition, the incorporation of EUG into the NBR matrix distinctly improved the sound absorption performance of NBR/EUG composites. This work is expected to provide a new insight into the fabrication of other composite materials with controllable damping and sound absorption properties.

中文翻译：

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动态阻尼和吸声性能可控的丁腈橡胶/杜仲胶复合材料的研制

为了提高丁腈橡胶 (NBR) 掺入杜仲胶 (EUG) 的阻尼和吸声性能，使用开炼机成功制备了一系列 NBR/EUG 复合材料。系统地研究了NBR/EUG复合材料的共硫化行为、断口形貌观察、力学性能和热性能以及阻尼和吸声性能。结果表明，NBR/EUG复合材料的结晶区和非晶区呈现海岛相分布，大部分EUG晶体为β型晶体。与纯 NBR 相比，NBR/EUG 复合材料的拉伸强度和储能模量随着 EUG 含量的增加而显着增加，这是由于 NBR/EUG 复合材料中晶体数量的逐渐增加。此外，在 NBR 基体中加入 EUG 显着提高了 NBR/EUG 复合材料的吸声性能。这项工作有望为其他具有可控阻尼和吸声性能的复合材料的制造提供新的见解。