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Controlling silicone-saccharide interfaces: greening silicones
Green Chemistry ( IF 9.3 ) Pub Date : 2017-08-09 00:00:00 , DOI: 10.1039/c7gc02088k Benjamin Macphail 1, 2, 3, 4 , Michael A. Brook 1, 2, 3, 4
Green Chemistry ( IF 9.3 ) Pub Date : 2017-08-09 00:00:00 , DOI: 10.1039/c7gc02088k Benjamin Macphail 1, 2, 3, 4 , Michael A. Brook 1, 2, 3, 4
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Silicone elastomers, which are normally crosslinked using metal catalysts, are traditionally reinforced with mineral fillers. We report that renewable saccharides can instead be used to both crosslink and reinforce silicones. The grafting of boronic acids to silicone polymers gives materials that, when added to aqueous solutions of mono- or polysaccharides, without catalysts, generated elastomers via the boronic acid interaction with saccharides. The efficiency of crosslinking, as shown by Young's moduli, depended strongly on the specific saccharide and the density of boronic acid groups on the silicone. Simple silicones normally phase separate in water saccharide mixtures. However, pretreatment of silicone boronates with the saccharide phytoglycogen, followed by exposure to water, led to stable aqueous phytoglycogen/silicone dispersions (pastes). The different outcomes arising from the order of addition are attributed to better dispersion of the silicone and saccharide in the latter case. Rheological studies of the pastes showed that, unlike the elastomers, viscosities depended more on the fraction of silicone in saccharide; number of boronic acid contact points between the silicone and saccharide was only a minor contributor. The equilibrium concentration of sugar/boronate contacts, which stabilize the water/oil interfaces, remains high even at high concentrations of water and even when the specific binding constant for an individual saccharide is low.
中文翻译：
控制有机硅-糖类界面：绿色有机硅
通常使用金属催化剂交联的有机硅弹性体通常使用矿物填料进行增强。我们报告说，可替代的糖可以替代地用于交联和增强有机硅。将硼酸接枝到有机硅聚合物上，得到的材料在不加催化剂的情况下添加到单糖或多糖的水溶液中时，可通过硼酸与糖的相互作用。如杨氏模量所示，交联的效率很大程度上取决于特定的糖和硅酮上硼酸基团的密度。简单的有机硅通常在水糖混合物中发生相分离。但是，用糖类植物糖原预处理硅酸硼酸酯，然后暴露于水，会产生稳定的植物糖原/有机硅水性分散液（糊剂）。由添加顺序引起的不同结果归因于在后一种情况下硅酮和糖类的更好分散。糊剂的流变学研究表明，与弹性体不同，粘度更多地取决于糖中有机硅的比例。硅酮和糖之间的硼酸接触点的数量只是很小的贡献。
更新日期：2017-09-19
中文翻译：
控制有机硅-糖类界面：绿色有机硅
通常使用金属催化剂交联的有机硅弹性体通常使用矿物填料进行增强。我们报告说，可替代的糖可以替代地用于交联和增强有机硅。将硼酸接枝到有机硅聚合物上，得到的材料在不加催化剂的情况下添加到单糖或多糖的水溶液中时，可通过硼酸与糖的相互作用。如杨氏模量所示，交联的效率很大程度上取决于特定的糖和硅酮上硼酸基团的密度。简单的有机硅通常在水糖混合物中发生相分离。但是，用糖类植物糖原预处理硅酸硼酸酯，然后暴露于水，会产生稳定的植物糖原/有机硅水性分散液（糊剂）。由添加顺序引起的不同结果归因于在后一种情况下硅酮和糖类的更好分散。糊剂的流变学研究表明，与弹性体不同，粘度更多地取决于糖中有机硅的比例。硅酮和糖之间的硼酸接触点的数量只是很小的贡献。
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