In order to prepare thermoresponsive polyurethane gels, a novel polyurethane bearing oligo(ethylene glycol) (OEG) as the side chain is successfully synthesized with hexamethylene diisocyanate and OEG tartrate ester. The aqueous solution of the polyurethane shows sharp and clear lower critical solution temperature behavior at 34 °C. Furthermore, a hydrogel based on the same polyurethane is also successfully prepared using glycerol as the crosslinker. This polyurethane hydrogel including 10 mol% of glycerol presents a large swelling ratio change between 4 °C and 37 °C from 250% to 40%.

中文翻译：

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在聚合物主链上不带多元醇的侧链含低聚乙二醇的热敏性聚氨酯实现了出色的亲水性和疏水性转换

为了制备热响应性聚氨酯凝胶，用六亚甲基二异氰酸酯和酒石酸OEG酯成功地合成了一种新型的侧链含低聚乙二醇（OEG）的聚氨酯。聚氨酯水溶液在34°C下表现出尖锐而清晰的较低临界溶液温度行为。此外，还使用甘油作为交联剂成功地制备了基于相同聚氨酯的水凝胶。包含10摩尔％甘油的聚氨酯水凝胶在4°C和37°C之间从250％到40％具有较大的溶胀率变化。