Damping materials play a significant role in reducing vibrations and noise. Presently, polyurethane (PU) elastomers fabricated from renewable resources have attracted considerable attention in damping fields owing to their significant benefits towards sustainable development and green production. Bio-based PU (bio-PU) elastomer is successfully synthesized from bio-based poly (trimethylene ether) glycol and bio-based 1,5-pentamethylene diisocyanate. Tannic acid (TA) is then incorporated into the bio-PU elastomer to enhance the damping, mechanical, and thermal properties by constructing multiple sacrificial networks. Depending on the energy dissipation of sacrificial networks, the fabricated bio-PU/TAcomposites exhibit a mechanical strength of 16.0 MPa (4.9 times higher than that of the bio-PU elastomer), with a glass-transition temperature raised from −63.7 to −26.8 °C and tanδ enhanced from 0.50 to 0.91. In addition, the abundant polyphenolic structures of TA endowed bio-PU/TA composites with excellent ultraviolet absorption capability and high transparency. This work not only develops elastomers with excellent and controllable damping properties, but also has the potential to advance the sustainable growth of PU industry.

中文翻译：

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通过构建多个牺牲网络实现阻尼性能可调的生物基聚氨酯/单宁酸复合材料


阻尼材料在减少振动和噪音方面发挥着重要作用。目前，由可再生资源制成的聚氨酯（PU）弹性体因其对可持续发展和绿色生产的显着效益而在阻尼领域引起了广泛关注。以生物基聚三亚甲基醚二醇和生物基1,5-戊二异氰酸酯为原料，成功合成了生物基PU（bio-PU）弹性体。然后将单宁酸 (TA) 纳入生物 PU 弹性体中，通过构建多个牺牲网络来增强阻尼、机械和热性能。根据牺牲网络的能量耗散，所制备的生物PU/TA复合材料的机械强度为16.0 MPa（比生物PU弹性体高4.9倍），玻璃化转变温度从-63.7升至-26.8 °C 和 tanδ 从 0.50 提高到 0.91。此外，TA丰富的多酚结构赋予生物PU/TA复合材料优异的紫外线吸收能力和高透明度。这项工作不仅开发出具有优异且可控阻尼性能的弹性体，而且有可能推动聚氨酯行业的可持续增长。