双敏性微凝胶的絮凝及聚沉行为flocculation and aggregation .pdf

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双敏性微凝胶的絮凝及聚沉行为flocculation and aggregation .pdf

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双敏性微凝胶的絮凝及聚沉行为flocculation and aggregation

2008 66 Vol. 66, 2008 4 , 449453 ACTA CHIMICA SINICA No. 4, 449453 · · a,b a a a *,a (a 200237) (b 200235) (N--co- ), NMR, DLS . 25 pH 7 Zeta 18 mV, , . NaCl 0.2 mol/L , , . , , Zeta . 0.2 mol/L NaCl , 41 Zeta 12.4 mV, . , Zeta , , (CFT). CFT , . N-; ; ; Flocculation and Aggregation Behavior of Doubly Responsive Microgel LIU, Wei-Juna,b ZHOU, Yuana CHEN, Hou-Yanga HUANG, Yong-Mina LIU, Hong-Lai*,a a ( Key Laboratory for Advanced Material of Education Ministry, Department of Chemistry, East China University of Science and Technology, Shanghai 200237) (b Department of Chemical Engineering, Shanghai Institute of Technology, Shanghai 200235) Abstract Poly(N-isopropylacrylamide-co-methacrylic acid) microgel was prepared by the precipitation polymerization method. NMR and TEM were used to analyze microstructure and morphology of the mi- crogel. The stability and zeta potential of the microgel were investigated as a function of electrolyte concen- tration by dynamic light scattering. Zeta potential was 18 mV in pH7 solution at 25 , which de- creased gradually with increasing ionic strength and reached an equilibrium value at 0.2 mol/L NaCl con- centration, indi