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    Effects of UV irradiation on the wettability of chitosan films containing dansyl derivatives

    Year: 2012

    Journal: Journal of Colloid and Interface Science 2012, 376 (1) pp 255-261, 20121211

    Authors: A.P.P. Praxedesa, A.J.C. da Silvab, R.C. da Silvab, R.P.A. Limaa, J. Tonholob, A.S. Ribeirob, I.N. de Oliveira

    Organizations: Instituto de Fi´sica, Universidade Federal de Alagoas, 57072-970 Maceió-AL, Brazil, b Instituto de Qui´mica e Biotecnologia, Universidade Federal de Alagoas, 57072-970 Maceió-AL, Brazil

    The morphological and wetting properties of chitosanfilmscontainingdansylderivatives have been investigated. By means of dynamic contact angle measurements, we study the modification of surface properties of chitosan-based films due to UVirradiation. The results were analyzed in the light of the molecular-kinetic theory which describes the wetting phenomena in terms of the statistical dynamics for the displacement of liquid molecules in a solid substrate. Our results show that the immobilization of dansyl groups in the chitosan backbone leads to a pronounced enhancement of the UV sensitivity of polymeric films.