Reversible Aggregation Kinetics of Poly(N-isopropylacrylamide-co-N-vinylpyrrolidone) in Aqueous Solutions Revealed by Elastic Light Scattering Spectroscopy  

作　　者：夏远军 HUANG Yunwei 易国斌 ZU Xihong YIN Qingshui CHEN Xudong 

机构地区：[1]Southern Medical University [2]Department of Orthopedics, Liu Hua Qiao Hospital [3]School of Chemical Engineering and Light Industry, Guangdong University of Technology [4]Key Laboratory for Polymer Composite and Functional Materials of the Ministry of Education, DSAPM Lab, School of Chemistry and Chemical Engineering, Sun Yat-sen University

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2013年第4期766-772,共7页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Natural Science Foundation of China(50973129,51273048);the National Natural Science Foundation of Guangdong Province(S2012010009743)

摘　　要：Poly（N-isopropylacrylamide-co-N-vinylpyrrolidone） [P（NIPAM-co-NVP）] copolymers with different content of N-vinylpyrrolidone （NVP） were synthesized, and reversible aggregation kinetics of the copolymers in aqueous solutions was investigated with elastic light scattering （ELS） spectra. The results indicated that the apparent activation energy of aggregation process during heating and dissociation process during cooling increased with the NVP content increasing. The phase transition temperature also increased as the content of NVP increased, suggesting that the hydrophilic nature of NVP strongly affected the phase behavior of the copolymer solutions. The higher the content of NVP, the higher the temperature required to break the balance between the hydrophilic and hydrophobie interaction. Besides, during heating and cooling process, the phase transition hysteresis of P（NIPAM-co-NVP） chains decreased when the hydrophilic comonomer increased.Poly（N-isopropylacrylamide-co-N-vinylpyrrolidone） [P（NIPAM-co-NVP）] copolymers with different content of N-vinylpyrrolidone （NVP） were synthesized, and reversible aggregation kinetics of the copolymers in aqueous solutions was investigated with elastic light scattering （ELS） spectra. The results indicated that the apparent activation energy of aggregation process during heating and dissociation process during cooling increased with the NVP content increasing. The phase transition temperature also increased as the content of NVP increased, suggesting that the hydrophilic nature of NVP strongly affected the phase behavior of the copolymer solutions. The higher the content of NVP, the higher the temperature required to break the balance between the hydrophilic and hydrophobie interaction. Besides, during heating and cooling process, the phase transition hysteresis of P（NIPAM-co-NVP） chains decreased when the hydrophilic comonomer increased.

关 键 词：poly（N-isopropylacrylamide-co-N-vinylpyrrolidone） kinetics aggregation hydrophilicity elastic light scattering spectra 

分 类 号：O631.3[理学—高分子化学]