Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Rheological Behavior of a chitosan/xanthan gum hydrogel
Submission Author:
Letícia Moreira Dutra , RJ , Brazil
Co-Authors:
Angélica Costa, Edwin Elard Garcia-Rojas, Letícia Moreira Dutra
Presenter: Letícia Moreira Dutra
doi://10.26678/ABCM.COBEM2017.COB17-1548
Abstract
Chitosan, a cationic polymer from crustacean shells, has unique properties that have made it the subject of many studies when it comes to developing biopolymers based products. When in solution or in association (as a hydrogel) with polyanionic polymers, such as xanthan gum, chitosan becomes a versatile biopolymer having characteristics such as biodegradability, biocompatibility, bioadhesiveness, mechanical strength and gel capacity, which makes it attractive in a wide variety of applications. Hydrogel formed by polyelectrolyte complexation between chitosan and xanthan gum was studied. The ideal pH for the formation of this hydrogel was defined by the zeta potential data. The behavior of the solutions polysaccharides and the hydrogel were analyzed by oscillatory rheological measurements. Rheological data confirmed the viscoelastic characteristics of these hydrogels, with G’ being always greater than G‟ in the frequency range studied. Chitosan presented, at low frequencies, a liquid-like behavior while xanthan solution presented a gel-like behavior. In creep and recovery analysis, chitosan/xanthan hydrogel recovered in 49%.
Keywords
polysaccharide, polyelectrolyte, viscoelasticity, Rheology, hydrogel
