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采用对N-异丙基丙烯酰胺-丙烯酸共聚微凝胶进行改性的方法合成了含苯并18-冠-6功能基团的PNIPAM微凝胶.红外和核磁光谱等手段证明苯并18-冠-6基团被引入到微凝胶中.改性后的微凝胶仍具有很好的温敏性,但是相转变温度由改性前的30℃提高到42℃,并且溶胀度也大大增加.在不控制离子强度的条件下微凝胶的粒径随Na+浓度增加而减小,但是随Pb2+浓度增加微凝胶粒径先减后增.在控制离子强度不变的条件下Na+浓度对微凝胶的粒径影响很小,但是随Pb2+浓度增加微凝胶粒径明显增大,显示较强的铅离子敏感性。
PNIPAM microgels containing benzo 18-crown-6 functional groups were synthesized by the modification of N-isopropylacrylamide-acrylic acid co-polymer microgels. The results of IR and NMR showed that benzo 18- The crown-6 group was introduced into the microgel.The modified microgel still has good temperature sensitivity, but the phase transition temperature increased from 30 ℃ before modification to 42 ℃, and the degree of swelling was also great Increase.With the control of ionic strength, the microgel size decreased with the increase of Na + concentration, but with the increase of Pb2 + concentration, the microgel size decreased first and then increased.Under the condition of constant ionic strength, Na + concentration Little effect on the particle size of the microgel, but with the increase of Pb2 + concentration, the size of the microgel obviously increases, showing a strong lead ion sensitivity.