pH- and Temperature-sensitive Behavior of Poly(N-isopropyl acrylamide-co-methacrylic acid) Microgels

Kong Soo Kim; Myung Ho Kim; Suk Hyung Cho

Journal of Industrial and Engineering Chemistry, Vol.11, No.5, 736-742, September, 2005

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pH- and Temperature-sensitive Behavior of Poly(N-isopropyl acrylamide-co-methacrylic acid) Microgels

Kong Soo Kim^†, Myung Ho Kim¹, and Suk Hyung Cho²

Department of Chemical Engineering College, Chung-buk University, Cheongju, Chungbuk 360-763, Korea
¹LG Chemical Ochang Science & Industrial Complex, Cheonwon, Chungbuk 363-911, Korea
²Department of Medical Materials, Hyejeon College, Hongsung-eup 350-800, Korea

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Poly(NIPAM-co-MAA) microgels composed of the temperature-sensitive polymer PNIPAM and the pH-sensitive polymer PMAA were prepared using an emulsifier-free emulsion polymerization method. The morphology of the microgel particles was observed by TEM and their hydrodynamic diameters were deter-mined using photon correlation spectroscopy. The effects that the pH, temperature, and KCl concentration have on the microgel particles were investigated. The hydrodynamic diameters of the microgel particles increased continuously upon increasing the pH; they were greatly swollen above pH 5. The hydrodynamic diameters of the microgel particles were decreased drastically upon increaseing the temperature and their swelling ratios decreased drastically upon increasing the ionic strength. These results show that the microgel particles exhibited combined pH- and temperature-sensitivity at pH values of ca. 5.5 and in the temperature range 30~37.5 ℃. The shrinking transition became broad and shifted progressively to lower temperature as the KCl concentration increased. Meanwhile, the electophoretic mobility and zeta potential of the microgel particles were dependent on the pH and temperature at a constant ionic strength.

Keywords:emulsifier-free emulsion polymerization;poly(NIPAM-co-MAA) microgels;pH/temperature-sensitive microgels;swelling/deswelling behavior;colloidal particles

[References]

Kratz K, Hellweg T, Eimer W, Colloids Surf. A: Physicochem. Eng. Asp., 170, 137 (2000)
Loxleg A, Vincent B, Colloid Polym. Sci., 275, 1108 (1997)
Saunders BR, Vincent B, J. Chem. Soc.-Faraday Trans., 92, 3385 (1996)
Crowther HM, Saunders BR, Mears SJ, Cosgrove T, Vincent B, King SM, Yu GE, Colloids Surf. A: Physicochem. Eng. Asp., 152, 327 (1999)
Kim JH, Ballauff M, Colloid Polym. Sci., 277, 1210 (1999)
Kaggwa GB, Carey MJ, Such C, Saunders BR, J. Colloid Interface Sci., 257(2), 392 (2003)
Kwon IC, Bae YH, Kim SW, Nature, 354, 291 (1991)
Winnik FM, Polymer, 31, 2125 (1990)
Chee CK, Rimmer S, Soutar I, Swanson L, Polymer, 38(2), 483 (1997)
Pelton RH, Chibante P, Colloids Surf., 20, 247 (1986)
Snowden MJ, Chowolhry BZ, Vincent B, Morris GE, J. Chem. Soc.-Faraday Trans., 92, 5013 (1996)
Makino K, Agata H, Ohshima H, J. Colloid Interface Sci., 230(1), 128 (2000)
Duracher D, Sauzedde F, Elaissari A, Perrin A, Pichot C, Colloid Polym. Sci., 276, 219 (1998)
Brazel CS, Peppas NA, Macromolecules, 28(24), 8016 (1995)
Shibayama M, Tanaka T, Adv. Polym. Sci., 109, 1 (1993)
Zhang J, Peppas NA, Macromolecules, 33(1), 102 (2000)
Liang L, Liu J, Gong XY, Langmuir, 16(25), 9895 (2000)
Sur GS, Lyu SG, Chang JH, J. Ind. Eng. Chem., 9(1), 58 (2003)
Chan VC, Hoffmann AS, Nature, 373, 49 (1955)
Tanaka T, Fillmore D, Sun S, Nishio I, Swislow G, Phys. Rev. Lett., 45, 1636 (1980)

[Referenced By]

[1] Kratz K, Hellweg T, Eimer W, Colloids Surf. A: Physicochem. Eng. Asp., 170, 137 (2000)

[2] Loxleg A, Vincent B, Colloid Polym. Sci., 275, 1108 (1997)

[3] Saunders BR, Vincent B, J. Chem. Soc.-Faraday Trans., 92, 3385 (1996)

[4] Crowther HM, Saunders BR, Mears SJ, Cosgrove T, Vincent B, King SM, Yu GE, Colloids Surf. A: Physicochem. Eng. Asp., 152, 327 (1999)

[5] Kim JH, Ballauff M, Colloid Polym. Sci., 277, 1210 (1999)

[6] Kaggwa GB, Carey MJ, Such C, Saunders BR, J. Colloid Interface Sci., 257(2), 392 (2003)

[7] Kwon IC, Bae YH, Kim SW, Nature, 354, 291 (1991)

[8] Winnik FM, Polymer, 31, 2125 (1990)

[9] Chee CK, Rimmer S, Soutar I, Swanson L, Polymer, 38(2), 483 (1997)

[10] Pelton RH, Chibante P, Colloids Surf., 20, 247 (1986)

[11] Snowden MJ, Chowolhry BZ, Vincent B, Morris GE, J. Chem. Soc.-Faraday Trans., 92, 5013 (1996)

[12] Makino K, Agata H, Ohshima H, J. Colloid Interface Sci., 230(1), 128 (2000)

[13] Duracher D, Sauzedde F, Elaissari A, Perrin A, Pichot C, Colloid Polym. Sci., 276, 219 (1998)

[14] Brazel CS, Peppas NA, Macromolecules, 28(24), 8016 (1995)

[15] Shibayama M, Tanaka T, Adv. Polym. Sci., 109, 1 (1993)

[16] Zhang J, Peppas NA, Macromolecules, 33(1), 102 (2000)

[17] Liang L, Liu J, Gong XY, Langmuir, 16(25), 9895 (2000)

[18] Sur GS, Lyu SG, Chang JH, J. Ind. Eng. Chem., 9(1), 58 (2003)

[19] Chan VC, Hoffmann AS, Nature, 373, 49 (1955)

[20] Tanaka T, Fillmore D, Sun S, Nishio I, Swislow G, Phys. Rev. Lett., 45, 1636 (1980)