Waterborne polyurethane (WPU) damping material has been drawing much attention in academic field because of its low toxicity compared with polyurethane (PU) damping material. In order to expand the application range of WPU damping materials, it is necessary to further improve the hydrophobicity and damping properties of WPU. A novel dangling chain polyol-n (DCP-n, n expressed as average molecular weight of MPEG) was synthesized from methoxypolyethylene glycol (MPEG), isophorone diisocyanate (IPDI) and 1,1,1-tris (hydroxymethyl) propane (TMP). Subsequently, a series of dangling chain-n-waterborne polyurethane acrylate (DC-n-WPUA, n expressed as average molecular weight of MPEG) emulsions were synthesized using DCP-n as the chain extender. The increase of DCP-n length will fill in free volume, hinder the entry of water molecules. Therefore, improve the hydrophobic performance. In addition, the increase of DCP-n length will lead to more intermolecular friction, which can increase the dissipation of energy, and improves the damping performance of DC-n-WPUA. The test results show that the hydrophobicity of DC-n-WPUA film is improved, and the maximum static water contact angle can reach 110.6°. Dynamic mechanical analysis testing data showed that DC-500-WPUA has the best damping performance, and its effective damping temperature range was 77.9°C (−32.0 ~ 45.9°C). The carbamate group on DCP-n will produce hydrogen bonds to restrict the movement of the chain segments, and the hydrogen bond breakage requires more energy. This ameliorates the thermal stability and mechanical properties of DC-n-WPUA. Thus, the initial modulus of DC-n-WPUA larger than the initial modulus of WPUA. Therefore, the DC-n-WPUA have the potential to be applied to hydrophobic damping coatings in the future.

中文翻译：

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具有悬链结构的水性聚氨酯丙烯酸酯乳液：同时表现出宽阻尼温度范围和优异的疏水性能

水性聚氨酯(WPU)阻尼材料由于与聚氨酯(PU)阻尼材料相比具有低毒性而备受学术界关注。为了扩大WPU阻尼材料的应用范围，有必要进一步提高WPU的疏水性和阻尼性能。由甲氧基聚乙二醇 (MPEG)、异佛尔酮二异氰酸酯 (IPDI) 和 1,1,1-三（羟甲基）丙烷 (TMP) 合成了一种新型悬链多元醇-n（DCP-n，n 表示为 MPEG 的平均分子量） . 随后，以DCP-n为扩链剂，合成了一系列悬链正水性聚氨酯丙烯酸酯（DC-n-WPUA，n表示为MPEG的平均分子量）乳液。DCP-n长度的增加会填充自由体积，阻碍水分子的进入。所以，提高疏水性能。此外，DCP-n长度的增加会导致更多的分子间摩擦，从而增加能量的耗散，提高DC-n-WPUA的阻尼性能。测试结果表明，DC-n-WPUA薄膜的疏水性有所提高，最大静态水接触角可达110.6°。动态力学分析测试数据显示，DC-500-WPUA阻尼性能最佳，有效阻尼温度范围为77.9℃（-32.0~45.9℃）。DCP-n上的氨基甲酸酯基团会产生氢键来限制链段的运动，氢键断裂需要更多的能量。这改善了 DC-n-WPUA 的热稳定性和机械性能。因此，DC-n-WPUA的初始模量大于WPUA的初始模量。所以，