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以化学交联的聚乙烯醇(PVA)凝胶为基质,固定由沉淀聚合法制备的聚(丙烯酰胺-co-甲基丙烯酸)[P(AM-co-MAA)]微凝胶和刚果红,构筑了对p H有光学响应性的新型复合凝胶膜。采用连接有紫外-可见分光光度计的测试系统对复合凝胶膜的传感性能进行了研究,并考察了复合凝胶膜的响应时间和稳定性。结果表明,P(AM-co-MAA)微凝胶和刚果红对光吸收性能有明显的协同增效作用,复合凝胶膜的p H响应范围为4.1~0.5,响应时间小于100 s,显示出比固定单一p H敏感物更优越的性能。
Poly (acrylamide-co-methacrylic acid) [P (AM-co-MAA)] microgels prepared by a precipitation polymerization method and Congo red , A novel composite gel membrane with optical responsivity to p H was constructed. Sensing performance of the composite gel membrane was investigated by a test system connected with UV-Vis spectrophotometer, and the response time and stability of the composite gel membrane were investigated. The results showed that P (AM-co-MAA) microgel and Congo red had a synergistic effect on light absorption. The p H response range of the composite gel membrane was 4.1 ~ 0.5 and the response time was less than 100 s Outperforms the performance of a single p H-sensitive sensor.