New polyelectrolyte complex from pectin/chitosan and montmorillonite clay.
A new nanocomposite hydrogel was prepared by forming a crosslinked hybrid polymer network based on chitosan and pectin in the presence of montmorillonite clay. The influence of clay concentration (0.5 and 2% wt) as well as polymer ratios (1:1, 1:2 and 2:1) was investigated carefully. The samples were characterized by different techniques: transmission and scanning electron microscopy, X-ray diffraction, thermogravimetric analysis, infrared spectroscopy, swelling degree and compression test. Most samples presented swelling degree above 1000%, which permits characterizing them as superabsorbent material. Images obtained by transmission electron microscopy showed the presence of clay nanoparticles into hydrogel. The hydrogels' morphological properties were evaluated by scanning electron microscope in high and low-vacuum. The micrographs showed that the samples presented porous. The incorporation of clay produced hydrogels with differentiated morphology. Thermogravimetric analysis results revealed that the incorporation of clay in the samples provided greater thermal stability to the hydrogels. The compression resistance also increased with addition of clay.
Instituto de Química, Universidade do Estado do Rio de Janeiro, Rua São Francisco Xavier, 524, PHLC, sala 310, Maracanã, 20550-900 Rio de Janeiro, Brazil. Electronic address: mpmcosta@outlook.com.
Marcia Parente Melo
MP
da Costa
Instituto de Química, Universidade do Estado do Rio de Janeiro, Rua São Francisco Xavier, 524, PHLC, sala 310, Maracanã, 20550-900 Rio de Janeiro, Brazil. Electronic address: ivanamello@uerj.br.
Ivana Lourenço
IL
de Mello Ferreira
Instituto de Química, Universidade do Estado do Rio de Janeiro, Rua São Francisco Xavier, 524, PHLC, sala 310, Maracanã, 20550-900 Rio de Janeiro, Brazil. Electronic address: cruzmtm@uerj.br.
Mauricio Tavares
MT
de Macedo Cruz
D000538:Aluminum Silicates / Q000737:chemistry*; D001546:Bentonite / Q000737:chemistry; D048271:Chitosan / Q000737:chemistry*; D000077215:Clay; D010368:Pectins / Q000737:chemistry*; D000071228:Polyelectrolytes / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared
D000538:Aluminum Silicates; D000071228:Polyelectrolytes; D001546:Bentonite; D010368:Pectins; D048271:Chitosan; D000077215:Clay
Chitosan; Clay; Morphological properties; Pectin; Superabsorbent material; Thermal stability