Abstract
Chitosan and polyacrylic acid mixtures were prepared in different mole ratios and at different pH values and ionic strengths (0.025–0.300). Complex formation was detected by turbidity measurement and quantified by weighing the freeze dried pellet recovered by centrifugation. No insoluble complex formation at pH=2 was detected. In the 3 to 6 pH range, the maximum complex formation occurred at different mole ratios. Quantitative analysis of the supernatant showed that pH affects the complex composition. Solution ionic strength in the 0.025–0.300 range did not affect complex formation.
Supernatant pH measurement showed that in the 3 to 5 pH range, the pH of the mixture decreased as the complex was formed. At pH=6, the opposite behavior was observed. This information was used to propose a mechanism for complex formation which was confirmed by quantitative analysis of the supernatant and IR analysis of the insoluble complex. These studies showed that an electrostatic interaction between COO− and NH3 + groups was involved in complex formation.
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Chavasit, V., Kienzle-Sterzer, C. & Antonio Torres, J. Formation and characterization of an insoluble polyelectrolyte complex: Chitosan-polyacrylic acid. Polymer Bulletin 19, 223–230 (1988). https://doi.org/10.1007/BF00255376
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DOI: https://doi.org/10.1007/BF00255376