To achieve effective sound absorption in wide frequency bands under high pressures, Eucommia ulmoides gum (EUG) as one of the natural biopolymers was incorporated into styrene-butadiene rubber (SBR) to prepare sound absorption materials. The morphology, crystalline structure, and macro-performance (damping, sound absorption, and mechanical properties) of the as-produced composites were systemically investigated. When the EUG content was less than 30 phr, the EUG was dispersed in the SBR matrix as nanocrystallites primarily existed in the $\beta$-crystal form, which is demonstrated by wide-angle X-ray diffraction (WAXD) and polarizing microscope (POM). The dynamic mechanical thermal analyzer (DMA) results expressed that EUG had two dynamic mechanical loss peaks, i.e. the glass transition peak (Peak 1, -60–40$°\text{C}$) and melting transition peak (Peak 2, 30–60$°\text{C}$). Thus, the addition of EUG improved the damping performance of the composites in high-temperature areas to some extent. Moreover, in comparison to the neat SBR, the average sound absorption coefficient of SBR/EUG (70/30) composite increased by 24.23% in the frequency range of 3–8 kHz under 2.5 MPa, which show the excellent sound absorption properties. And since the EUG nanocrystallites played the role of physical crosslingking points, the SBR/EUG (70/30) composite also had outstanding comprehensive mechanical properties. The SBR/EUG composites may be applied to underwater sound absorption materials.

为了在高压下在宽频带中实现有效的吸声，将作为天然生物聚合物之一的杜仲胶（EUG）掺入丁苯橡胶（SBR）中以制备吸声材料。系统地研究了所生产复合材料的形态，晶体结构和宏观性能（阻尼，吸声和机械性能）。当EUG含量小于30 phr时，EUG分散在SBR基质中，因为纳米微晶主要存在于SBR基体中。$\beta$-结晶形式，其通过广角X射线衍射（WAXD）和偏光显微镜（POM）证明。动态机械热分析仪（DMA）的结果表明EUG具有两个动态机械损耗峰，即玻璃化转变峰（峰1，-60-40$°\text{C}$）和熔融转变峰（峰2，30–60$°\text{C}$）。因此，EUG的添加在一定程度上改善了复合材料在高温区域的阻尼性能。此外，与纯SBR相比，SBR / EUG（70/30）复合材料的平均吸声系数在2.5 MPa下3-8 kHz的频率范围内增加了24.23％，显示出优异的吸声性能。并且由于EUG纳米微晶起到了物理交联点的作用，因此SBR / EUG（70/30）复合材料也具有出色的综合机械性能。SBR / EUG复合材料可应用于水下吸声材料。