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Synthesis of waterborne polyurethane containing alkoxysilane side groups: Study on spacer linkages

机译:含有烷氧基硅烷侧组的水性聚氨酯的合成:垫片键的研究

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Environmentally friendly waterborne polyurethanes (WPUs) modified by moisture-curable alkoxysilane have been much studied nowadays. In this work, a new diol-bearing pendant urea-propyl trimethoxysilane (APD-Si) was synthesized and used as the chain extender in the preparation of a silicone-modified WPU dispersion. Both the formation of hybrid networks based on the condensation of trimethoxysilane groups and the enhanced microphase separation of the hard and soft segments have been found to rely on the strong hydrogen-bonding capability of the urea-containing spacers, which link the alkoxysilane groups with the backbone of WPU. Because of the synergism of chemically bonded silsesquioxane and physically hydrogen bonded hard domains serving as crosslinking points, the mechanical properties of the hybrid films of WPU are improved, especially the modulus and yield strength. (c) 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46628.
机译:现在研究了由可水分固化的烷氧基硅烷改性的环保水性聚氨酯(WPU)已经研究了很多。 在这项工作中,合成了一种新的二醇侧丙脲 - 丙基三甲氧基硅烷(APD-Si)并用作制备硅氧烷改性的WPU分散体中的链烷基。 已经发现基于三甲氧基硅烷基团的缩合的杂化网络的形成和硬质和软链段的增强的磁序分离依赖于含脲间隔物的强氢键合能力,其将烷氧基硅烷基团与其联系起来 WPU的骨干。 由于化学键合的Silsesquio烷和物理氢键硬域作为交联点的协同作用,改善了WPU的杂合膜的机械性能,尤其是模量和屈服强度。 (c)2018 Wiley期刊,Inc.J.Phill。 聚合物。 SCI。 2018,135,46628。

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