Tiera, M. J.Tiera, VADde Toledo, E. C.de Sena, G. L.2014-05-202014-05-202000-11-01Colloid and Polymer Science. New York: Springer-verlag, v. 278, n. 11, p. 1052-1060, 2000.0303-402Xhttp://hdl.handle.net/11449/35682The behaviour of hydrophobically modified poly(allylammonium) chloride having octyl, decyl, dodecyl and hexadecyl side chains has been studied in aqueous solution using fluorescence emission techniques. Micropolarity studies using the I-1/I-3 ratio of the vibronic bands of pyrene show that the formation of hydrophobic microdomains depends on both the length of the side chain and the polymer concentration. The I-1/I-3 ratio of the polymers with low hydrophobe content (less than 5% mel) changes substantially when reaching a certain concentration. These changes are assigned to aggregation originating from interchain interactions. This behaviour is also confirmed by the behaviour of the monomer/excimer emission intensities of pyrene- dodecanoic acid used as a probe. For polymers having dodecyl side chains and hydrophobe contents higher than 10%, aggregates are formed independently of the polymer concentration. Anisotropy measurements show that microdomains resulting from the inter- and/or intramolecular interactions are similar to those observed for cationic surfactants. Viscosity measurements show that the coil dimensions are substantially decreased for the polymers having high hydrophobe contents, indicating intramolecular associations.1052-1060engcationic amphiphilic polymersaggregationpyrene fluorescence spectroscopyhydrophobic microdomainsArtigo10.1007/s003960000367WOS:000165461000004Acesso restrito8796747160088337