Synthesis and properties of p(NIPA-co-NVP)/clay hydrogels by radiation polymerization

Synthesis and properties of p(NIPA-co-NVP)/clay hydrogels by radiation polymerization 1 first-author 1 2 1 corresp E-mail: zhucs@zzu.edu.cn E-mail: zhucs@zzu.edu.cn zhucs@zzu.edu.cn 1 1 School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450052, China; School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450052, China; Isotope Institute of Henan Academy of Sciences, Zhengzhou 450015, China Isotope Institute of Henan Academy of Sciences, Zhengzhou 450015, China In this study, hydrogels of P(NIPA-co-NVP)/clay were synthesized by γ-ray radiation. Different thermo-sensitive hydrogels were made under different experimental conditions such as dose, monomer ratio, and content of clay. X-ray diffraction shows that the layer distance between Na-clays is changed from 1.6 to 2.7 nm because Na-clay pieces can be intercalated or exfoliated by HTMAB, and that between P(NIPA-co-NVP)/Clay pieces is 3.4 nm. The swelling property tests show that the LCST of P(NIPA-co-NVP) is higher than PNIPA. With the increase of NVP content, LCST is higher. As the ratio of NIPA/NVP is 95/5, hydrogel shows the best swelling property and LCST is 37°C. LCST of P(NIPA-co-NVP)-clay hydrogel is not changed, but the strength and swelling properties are better. Thermo-sensitive hydrogels Copolymer hydrogels Radiation polymerization Clay Lower critical transition temperature (LCST) References Jeong B , Kim SW , Bae YH . Adv Drug Delivery Rev 2002 , 54 : 37 - 51 . Adv Drug Delivery Rev Xue W , Hamley IW , Huglin MB . Polymer 2002 , 43 : 5181 - 6 . Polymer Leroux JC , Roux E , Garrec DL , Hong K , Drummond DC . J Controlled Release 2001 , 72 : 71 - 84 . J Controlled Release Zhu PW , Napper DH . Langmuir 2000 , 16 : 8543 - 5 . Langmuir Zhao Y , Cao Y , Yang YL , Wu C . Macro-molecules 2003 , 36 : 855 - 9 . Macro-molecules Liang L , Liu J , Gong X Y . Langmuir , 2000 , 16 : 9895 . Langmuir A. El-Hag Ali , H.A. Shawky , H.A. Abd El Rehim , E.A. Hegazy . European Polymer Journal , 2003 , 39 : 2337 - 2344 European Polymer Journal CUI Zhifang , GUAN Yixin , YAO Shanjing . Chem.Eng . 2004 , 12 ( 4 ): 556 - 560 Chem.Eng ZHOU Shuhua , LIU Jian , YANG Jiangu . Polymer Materials Science and Engineering(in Chinese) . 2004 , 20 ( 3 ): 85 . Polymer Materials Science and Engineering(in Chinese) 10.1016/S1001-8042(07)60019-0 TB833,O631 Supported by Natural Science Foundation of Henan Province (0611023900) 2007-01-20 2021-01-19 2007 Nuclear Science and Techniques 01 18