Artículos de revistas
Interaction Between Peo-ppo-peo Triblock Copolymers And Ionic Surfactants In Aqueous Solution Studied Using Light Scattering And Calorimetry
Registro en:
Journal Of Physical Chemistry B. , v. 108, n. 1, p. 82 - 92, 2004.
15206106
2-s2.0-1642439074
Autor
Jansson J.
Schillen K.
Olofsson G.
Da Silva R.C.
Loh W.
Institución
Resumen
Properties of nonionic triblock copolymers of poly(ethylene oxide) (PEO) and poly(propylene oxide) (PPO) (EOnPOmEOn) in aqueous solution and their interaction with the ionic surfactants sodium dodecyl sulfate and hexadecyltrimethylammonium chloride have been investigated by static and dynamic light scattering, high sensitivity differential scanning, and isothermal titration calorimetry. The studied copolymers (denoted P123 and F127) have the same hydrophobic PPO central block (m = 68), but different length of the endblocks, n = 20 and 97. At 40°C, the copolymers are associated into micelles with hydrodynamic radius of 9.8 nm (P123) and 12.5 nm (F127) composed of a hydrophobic PPO core and a water-swollen PEO corona. The different copolymer/surfactant systems have been investigated at a constant copolymer concentration of 1 wt% and with varying surfactant concentration up to about 120 mM. When ionic surfactants are added to the PEO-PPO-PEO block copolymer micellar systems, three concentration regimes are observed in the results from the complementary experimental techniques. At low surfactant concentrations (<1-2 mM), single surfactant molecules associate with the copolymer micelle forming a large copolymer-rich complex that becomes increasingly charged. The relaxation time distributions from dynamic light scattering are monomodal and the electrostatic interaction is evidenced in both the static and the dynamic light scattering results. In the intermediate surfactant concentration regime, two types of copolymer-surfactant complexes coexist, one large copolymer-rich complex and one small complex consisting of one or a few copolymer chains and rich in surfactant. This indicates a peel-off mechanism behind the disintegration of the copolymer micelles. The titration calorimetric data present an exothermic signal as the PPO blocks become rehydrated when the copolymer micelles break-up. At high surfactant concentrations, only the small surfactant-rich complexes are present in the systems. 108 1 82 92 Tuzar, Z., Kratochvil, P., (1976) Adv. Colloid Interface Sci., 6, p. 201 Schmolka, I.R., (1977) J. Am. Oil Chem. Soc., 54, p. 110 Alexandridis, P., Hatton, A.T., (1995) Colloids Surf., A, 96, p. 1 Almgren, M., Brown, W., Hvidt, S., (1995) Colloid Polym. Sci., 273, p. 2 Chu, B., Zhou, Z., Physical chemistry of polyoxyalkylene block copolymer surfactants (1996) Nonionic Surfactants, 60, p. 67. , Nace, V. M., Ed. Surfactant Science Series Marcel Dekker: New York (2000) Amphiphilic Block Copolymers: Self-Assembly and Applications, , Alexandridis, P., Lindman, B., Eds. Elsevier Science BV: Amsterdam Kabanov, A.V., Alakhov, V.Y., (2002) Crit. Rev. Ther. Drug Carrier Syst., 19, p. 1 Alexandridis, P., Holzwarth, J.F., Hatton, T.A., (1994) Macromolecules, 27, p. 2414 Beezer, A.E., Loh, W., Mitchell, J.C., Royall, P.G., Smith, D.O., Tute, M.S., Armstrong, J.K., Crowther, N.J., (1994) Langmuir, 10, p. 4001 Linse, P., Malmsten, M., (1992) Macromolecules, 25, p. 5434 Linse, P., (1993) Macromolecules, 26, p. 4437 Linse, P., (1994) Macromolecules, 27, p. 6404 Linse, P., (1994) Macromolecules, 27, p. 2685 Brown, W., Schillén, K., Hvidt, S., (1992) J. Phys. Chem., 96, p. 6038 Reddy, N.K., Fordham, P.J., Attwood, D., Booth, C., (1990) J. Chem. Soc., Faraday Trans., 86, p. 1569 Brown, W., Schillén, K., Almgren, M., Hvidt, S., Bahadur, P., (1991) J. Phys. Chem., 95, p. 1850 Schillén, K., Brown, W., Johnsen, R.M., (1994) Macromolecules, 27, p. 4825 Chu, B., (1995) Langmuir, 11, p. 414 Mortensen, K., Pedersen, J.S., (1993) Macromolecules, 26, p. 805 Goldmints, I., Yu, G.-E., Booth, C., Smith, K.A., Hatton, T.A., (1999) Langmuir, 15, p. 1651 Mortensen, K., Talmon, Y., (1995) Macromolecules, 28, p. 8829 Nolan, S.L., Phillips, R.J., Cotts, P.M., Dungan, S.R., (1997) J. Colloid Interface Sci., 191, p. 291 Lehner, D., Lindner, H., Glatter, O., (2000) Langmuir, 16, p. 1689 Goldsmints, I., Von Gottberg, F.K., Smith, K.A., Hatton, T.A., (1997) Langmuir, 13, p. 3659 Glatter, O., Scherf, G., Schillén, K., Brown, W., (1994) Macromolecules, 27, p. 6046 Wanka, G., Hoffmann, H., Ulbricht, W., (1994) Macromolecules, 27, p. 4145 Noolandi, J., Shi, A.-C., Linse, P., (1996) Macromolecules, 29, p. 5907 Zhang, K., Lindman, B., Coppola, L., (1995) Langmuir, 11, p. 538 Holmqvist, P., Alexandridis, P., Lindman, B., (1998) J. Phys. Chem. B, 102, p. 1149 Ivanova, R., Alexandridis, P., Lindman, B., (2001) Colloids Surf., A, 183-185, p. 41 Alexandridis, P., Yang, L., (2000) Macromolecules, 33, p. 5574 Svensson, B., OIsson, U., Alexandridis, P., (2000) Langmuir, 16, p. 6839 Bryskhe, K., Schillén, K., Löfroth, J.-E., Olsson, U., (2001) Phys. Chem. Chem. Phys., 3, p. 1303 Almgren, M., Van Stam, J., Lindblad, C., Li, P., Stilbs, P., Bahadur, P., (1991) J. Phys. Chem., 95, p. 5677 Hecht, E., Hoffmann, H., (1994) Langmuir, 10, p. 86 Hecht, E., Mortensen, K., Gradzielski, M., Hoffmann, H., (1995) J. Phys. Chem., 99, p. 4866 Li, Y., Xu, R., Bloor, D.M., Holzwarth, J.F., Wyn-Jones, E., (2000) Langmuir, 16, p. 10515 Li, Y., Xu, R., Couderc, S., Bloor, D.M., Holzwarth, J.F., Wyn-Jones, E., (2001) Langmuir, 17, p. 5742 Thurn, T., Couderc, S., Sidhu, J., Bloor, D.M., Penfold, J., Holzwarth, J.F., Wyn-Jones, E., (2002) Langmuir, 18, p. 9267 Li, Y., Xu, R., Couderc, S., Bloor, D.M., Wyn-Jones, E., Holzwarth, J.F., (2001) Langmuir, 17, p. 183 Da Silva, R.C., Olofsson, G., Schillén, K., Loh, W., (2002) J. Phys. Chem. B, 106, p. 1239 Gallet, G., Carroccio, S., Rizzarelli, P., Karlsson, S., (2001) Polymer, 43, p. 1081 Marinov, G., Michels, B., Zana, R., (1998) Langmuir, 14, p. 2639 Linse, P., Hatton, T.A., (1997) Langmuir, 13, p. 4066 Berne, B.J., Pecora, R., (2000) Dynamic Light Scattering: With Applications to Chemistry, Biology, and Physics, 2nd Ed., , Dover Publications: New York Young, R.J., Lovell, P.A., (1996) Introduction to Polymers, 2nd Ed., , Chapman & Hall: Cambridge, U.K Siegert, A.J.P., (1943) MIT Rad. Lab. Rep., (465) Stepánek, P., (1993) Dynamic Light Scattering, p. 177. , Brown, W., Ed. Oxford University Press: Oxford, U.K Jakes, J., (1988) Czech. J. Phys., B38, p. 1305 Nicolai, T., Brown, W., Johnsen, R.M., Stepánek, P., (1990) Macromolecules, 23, p. 1165 Johnsen, R.M., Brown, W., (1992) Laser Light Scattering in Biochemistry, p. 77. , Harding, S. E., Sattelle, D. B., Bloomfield, V. A., Eds. The Royal Society of Chemistry: Cambridge, U.K Jakes, J., (1995) Collect. Czech. Chem. Commun., 60, p. 1781 Bäckman, P., Bastos, M., Hallén, D., Lönnbro, P., Wadsö, I., (1994) J. Biochem. Biophys. Methods, 28, p. 85 Vink, H., (1985) J. Chem. Soc., Faraday Trans. 1, 81, p. 1725 Brown, W., Nicolai, T., (1993) Dynamic Light Scattering, p. 272. , Brown, W., Ed. Oxford University Press: Oxford, U.K Durchschlag, H., Zipper, P., (1994) Prog. Colloid Polym. Sci., 94, p. 20 Pusey, P.N., Colloidal suspensions (1991) Liquids, Freezing and Glass Transition, 51st Ed., 2, p. 763. , Hansen, J. P., Levesque, D., Zinn-Justin, J., Eds. North-Holland: Amsterdam Wanka, G., Hoffmann, H., Ulbricht, W., (1990) Colloid Polym. Sci., 268, p. 101 Attwood, D., Collett, J.H., Tait, C.J., (1985) Int. J. Pharm., 26, p. 25 Jansson, J., Schillén, K., Nilsson, M., Söderman, O., Fritz, G., De Campo, L., Glatter, O., manuscript in preparationMazer, N.A., Benedek, G.B., Carey, M.C., (1976) J. Phys. Chem., 80, p. 1075 Dai, S., Tam, K.C., Jenkins, R.D., (2001) J. Phys. Chem. B, 105, p. 10189 Wang, G., Pelton, R., Zhang, J., (1999) Colloids Surf., A, 153, p. 335