Preparation and characterization of hydrogels obtained from chitosan and carboxymethyl chitosan

Chitosan and carboxymethyl chitosan-based hydrogels were prepared by crosslinking the biobased polymers with hexamethylene diisocyanate (HDI). The hydrogels were obtained in a simple one-pot route, using water as solvent, at room temperature and without the use of other additives. The obtained mater...

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Bibliographic Details
Published in:Journal of polymer research 2021-09, Vol.28 (9), Article 335
Main Authors: Ladeira, Natália Maria Borges, Donnici, Claudio Luis, de Mesquita, João Paulo, Pereira, Fabiano Vargas
Format: Article
Language:English
Subjects:
Additives
Biodegradability
Biomedical materials
Biopolymers
Characterization and Evaluation of Materials
Chemical analysis
Chemistry
Chemistry and Materials Science
Chitosan
Crosslinking
Fourier transforms
Hexamethylene diisocyanate
Hydrogels
Industrial Chemistry/Chemical Engineering
Infrared analysis
Morphology
Original Paper
Polymer Sciences
Pore size
Room temperature
Solvents
Swelling ratio
Thermogravimetric analysis
Water absorption
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Summary:Chitosan and carboxymethyl chitosan-based hydrogels were prepared by crosslinking the biobased polymers with hexamethylene diisocyanate (HDI). The hydrogels were obtained in a simple one-pot route, using water as solvent, at room temperature and without the use of other additives. The obtained materials were characterized using Fourier transform infrared spectroscopy (FTIR), Thermogravimetric analysis (TG/DTG), X-ray diffraction (XRD), elemental analysis (CHN) and scanning electron microscopy (SEM) techniques. The water absorption capacity and absorption kinetics were also studied at different pH values. The comparison between the hydrogels obtained from the different biopolymers showed remarkable differences including water absorption capacity (swelling ratio) which is up to ~ 15 for the chitosan-based hydrogel and reached ~ 64 for the carboxymethyl chitosan-based hydrogel. In addition, the morphologies obtained for each sample were also considerably different. The chitosan-based hydrogels did not present pores before the swelling process, and after that, only the presence of a heterogeneous pores structure was observed. On the other hand, for the CMC-based hydrogels a homogeneous porous structure was noticed before and after the swelling process, and a significant increase in pore size was observed after water absorption. Since the two kinds of hydrogels obtained here were prepared through an easy and efficient route, using water as solvent and present potential biodegradability, simultaneously with a good swelling capacity, particularly for the CMC-based hydrogels, the obtained materials can find application in different areas such as agricultural or biomedical.
ISSN:1022-9760
1572-8935
DOI:10.1007/s10965-021-02682-z