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《Acta Polymerica Sinica》 2005-01
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MICELLIZATION STUDIES OF THERMO-SENSITIVE GRAFT COPOLYMERS IN AQUEOUS SOLUTIONS BY MEANS OF SURFACE TENSION MEASUREMENTS

LI Yuping, WANG Li-Qun, TU Kehua (Institute of Polymer Science, Zhejiang University, Hangzhou 310027)  
The micellization of thermo-responsive dextran-g-PNIPAM copolymers in aqueous solutions was studied by means of surface tension technique.The surface tension of the aqueous solutions of the graft copolymers was determined over the concentration range of 0.0001 wt% to 0.5 wt% at two temperatures (15 and 37℃).It was found that the absorption of the graft polymers at the air/water interface behaved in a dynamic way.The critical micellization concentration (CMC) of the copolymers was determined from curves of the surface tension versus lg concentration.The micellization behavior depended closely on the grafting of the copolymers and the aqueous solution temperature.Micelles could be formed in the lower concentrations when increasing PNIPAM contents of the copolymers or raising the aqueous solution temperature.More importantly,the copolymers showed CMCs in all cases no mater whether the temperature was higher than the phase transition temperature (LCST) of the copolymers or not.An explanation was given for understanding the phenomenon
【Fund】: 国家自然科学基金资助项目(基金号50175022);; 高分子物理与化学国家重点实验室(长春)科学基金资助项目(2003)
【CateGory Index】: O648
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