The pH-sensitive smart hydrogel sensor was studied. The hydrogel was prepared from polymerization reaction between the 2-hydroxyethyl methacrylate and diallyldimethyammonium chloride using potassium persulfate as an initiator, N, N′-methylenebisacrylamide as a cross-linker and N, N, N′, N′-tetramethylethylenediamine as an accelerator. Bromothymol blue was added to the polymerization system to produce the pH-sensitive hydrogel. The results showed that the hydrogel exhibited properties as a sensor capable of detecting acid–base solutions. The fluid sensing of the hydrogel showed sign of a change in color of the bromothymol blue in the gel. Factor affecting the properties of the hydrogel sensors such as the color change, recovery from bending, and swelling property was the concentration of the diallyldimethyammonium chloride.

中文翻译：

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具有 pH 敏感性的水凝胶传感器

研究了pH敏感的智能水凝胶传感器。以过硫酸钾为引发剂，N,N'-亚甲基双丙烯酰胺为交联剂，N,N,N',N'-四甲基乙二胺为促进剂，由甲基丙烯酸2-羟乙酯与二烯丙基二甲基氯化铵聚合反应制备水凝胶。将溴百里酚蓝加入到聚合体系中以制备 pH 敏感水凝胶。结果表明，水凝胶表现出作为能够检测酸碱溶液的传感器的特性。水凝胶的流体传感显示出凝胶中溴百里酚蓝颜色发生变化的迹象。影响水凝胶传感器性能的因素如颜色变化、弯曲恢复和溶胀性能是二烯丙基二甲基氯化铵的浓度。