A hydrogen bonded UCST polymer has been developed by grafting of methacrylamide and acrylic acid on dextran via free radical polymerization. By varying the methacrylamide concentration, four different grades of copolymers have been synthesized, which form H-bonds between acid and amide groups at low temperature. This makes the copolymer insoluble (forms aggregates) in water while becoming soluble beyond a certain temperature (T_CP) when the H-bonds collapse (aggregates break down), which is also evident from dynamic light scattering analysis. The effects of pH, monomer composition, and the concentration of the polymer and salt on the cloud point have been explored in detail.

中文翻译：

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具有可调热响应行为的水介质中葡聚糖基共聚物的 UCST 相变

通过自由基聚合将甲基丙烯酰胺和丙烯酸接枝到葡聚糖上，开发了氢键 UCST 聚合物。通过改变甲基丙烯酰胺的浓度，合成了四种不同等级的共聚物，它们在低温下在酸和酰胺基团之间形成氢键。这使得共聚物在水中不溶（形成聚集体），而当H 键崩塌（聚集体分解）时，在超过一定温度 (TCP _{)时变得可溶，这从动态光散射分析中也可以看出。}已经详细探讨了 pH 值、单体组成以及聚合物和盐的浓度对浊点的影响。