Abstract
Interpolyelectrolyte complexes (IPECs) were obtained by the solution mixing method from chitosan and poly(sodium 4-styrenesulfonate), NaPSS. XRD, FTIR spectroscopy, and thermogravimetric analysis indicated that IPEC formation inhibits the occurrence of crystalline regions in the resultant solid IPECs. Turbidimetry, viscometry, conductometry, and zeta potential measurements showed that at a sulfonate to aminium molar ratio = 1, the process of IPEC production is optimum. Average hydrodynamic diameters, calculated from DLS measurements, showed that IPEC formation occurs in two stages: first there is a decrease in macromolecular dimensions, as sulfonate to aminium molar ratio is increased. At a characteristic sulfonate to aminium molar ratio, soluble IPEC structures collapse to form phase segregated clusters that begin to nucleate the formation of larger, insoluble, IPEC particles.
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Acknowledgements
The authors thank Brazil’s Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and Science without Borders Program, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), PRHPB-222, and Pró-Reitoria de Pesquisa da Universidade Federal do Rio Grande do Norte (PROPESQ-UFRN) for financial support during the course of this work.
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de Lima, C.R.M., Pereira, M.R. & Fonseca, J.L.C. Nanosized dispersions based on chitosan and NaPSS. J Polym Res 24, 51 (2017). https://doi.org/10.1007/s10965-017-1214-7
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DOI: https://doi.org/10.1007/s10965-017-1214-7