Complexes of octadecyltrimethylammonium polyacrylate: properties in solution,gel and solid forms |
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Authors: | Paolo Michiotti Maria Bonicelli Patrizia Cafarelli Gianfranco Ceccaroni Carla Ferragina Camillo La Mesa |
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Affiliation: | 1.Dipartimento di Chimica, Università degli Studi di Roma "La Sapienza", P. le A. Moro 5, 00185 Rome, Italy,;2.Dipartimento I.C.M.M.P.M., Università degli Studi di Roma "La Sapienza", Via del Castro Laurenziano 7, 00185 Rome, Italy,;3.CNR, IMIP, Istituto di Metodologie Avanzate e Plasmi, Via Salaria Km. 29.300, 00016 Monterotondo, Rome, Italy,;4.Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma "Tor Vergata", Via della Ricerca Scientifica s.n.c., 00100 Rome, Italy, |
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Abstract: | A polymer-surfactant complex (OTAPA) was prepared by titration of aqueous poly(sodium acrylate) with stoichiometric amounts of octadecyltrimethylammonium chloride. The resulting product is not water-soluble and does not dissolve in most polar and nonpolar, liquids. OTAPA has peculiar thermal behaviour and interesting structural properties. It has a high melting temperature and decomposes around 350 °C. According to preliminary X-ray findings, the complex is formed by an arrangement of alkyl chains around the polymer skeleton, packed into a layered structure. The complex forms an elastic gel in ethylene glycol, and, to a much lesser extent, in glycerol or tetrahydrofuran, but is hardly water-soluble. Indeed, the occurrence of micelle-assisted dissolution and the precipitation of OTAPA from such mixtures, upon dilution with water, have been observed. Applications of OTAPA as a hydrophobic modifier of surfaces can be considered. |
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