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首页> 外文期刊>Journal of Applied Polymer Science >Effects of different segments in polyurethane on the performance of sand stabilization
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Effects of different segments in polyurethane on the performance of sand stabilization

机译：不同段在聚氨酯中对砂稳定性能的影响

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Synthetic polymers have recently drawn increasing attention to chemical sand stabilization (CSS). The relationship between the molecular structure and the fixing effect, however, is rarely reported aside from the performance. In this article, different segments of waterborne polyurethane dispersions (PUDs) are discussed with respect to their influence on stabilizing sand. We prepared five PUDs by controlling parameters including the diisocyanate-to-polyol ratio (R) and the molecular weight and characterized them with Fourier transform infrared spectroscopy and laser particle analysis. The unconfined compressive strength (UCS), a key criterion in CSS, was used to evaluate the performance of the PUDs. We found that a bigger R gave the polyurethane (PU) film a higher strength than the smaller R but did not do the same to the sand mold. This indicated that homogeneity was a primary property of the sand mold. Taking the details of the crushed sand molds and the PU films into account, we concluded that the soft segments played a major role in the homogeneity. Force analysis showed that four modes of breaking occurred at the interface of the sand and cured PU. We concluded that whereas the hard segments in PU determined the ceiling of the UCS, the soft segments determined the floor by benefiting adsorption. (c) 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47267.
机译：合成聚合物最近引起了越来越关注化学砂稳定（CSS）。然而，除了性能之外，分子结构与定影效果之间的关系很少报道。在本文中，关于它们对稳定砂的影响讨论了水性聚氨酯分散体（PUD）的不同段。通过控制包括二异氰酸酯 - 多元醇比（R）和分子量的参数来制备五个PUD，并用傅里叶变换红外光谱和激光粒子分析表征它们。非束缚的压缩强度（UCS）是CSS中的关键标准，用于评估PUD的性能。我们发现更大的R给聚氨酯（PU）薄膜更高的强度比较小的R更高，但与砂模并不这样做。这表明均匀性是砂模的主要特性。考虑到碎砂模和PU电影的细节，我们得出结论，软细分市场在同质性中发挥了重要作用。力分析表明，砂和固化PU的界面发生了四种破裂模式。我们得出结论，虽然PU的硬片确定了UCS的天花板，但是软段通过受益吸附来确定地板。 （c）2018 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2019,136,47267。

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