Investigation of Chitosan-PVA Composite Films and Their Adsorption Properties

Saskatoon,; Saskatchewan.,; Canada, .

doi:10.4236/gep.2015.32013

Cited by 45 publications

(29 citation statements)

References 19 publications

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“…However, in the case of heterogeneously crosslinked chitosan membranes formed by electrospinning, thermogravimetric analysis scans by Correia et al [59] did not demonstrate differences between neutralized chitosan films and ethanol neutralized-heterogeneously crosslinked GTA membranes, showing that heterogeneous crosslinking with GTA does not necessarily lower the decomposition onset temperature. and reaches a maximum degradation rate near 275 °C [43]. For our neutralized films, only a 1% mass loss was found between 200 and 250 °C and the differential thermogravimetric analysis peak was at 290 °C.…”

Section: Gta-crosslinked Filmsmentioning

confidence: 64%

“…Neutralized films were prepared by submerging dried neat films in solutions of 0.2 M NaOH for 30 min, and were then thoroughly rinsed with ultra-pure water until the pH of the diluent reached that of water. Excess water was wiped off the surface, and the wet neutralized films were firmly clamped between a frame and glass plate to maintain shape and dimensions and avoid shrinkage [43], and were then dried in an environmental chamber at 23 • C and 50% RH for 24 h.…”

Section: Film Preparationmentioning

confidence: 99%

“…This peak could be more representative of a glass-rubber transition which is speculated to exist within the film degradation range. The degradation of neutralized chitosan films typically begins near 200 • C and reaches a maximum degradation rate near 275 • C [43]. For our neutralized films, only a 1% mass loss was found between 200 and 250 • C and the differential thermogravimetric analysis peak was at 290 • C. It cannot be ruled out that the GTA-HET peak onset at 170 • C could be due to an earlier onset of degradation, as crosslinking with GTA [58] has been found to do.…”

Section: Gta-crosslinked Filmsmentioning

confidence: 99%

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Viscoelastic Properties of Crosslinked Chitosan Films

2019

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Chitosan films containing citric acid were prepared using a multi-step process called heterogeneous crosslinking. These films were neutralized first, followed by citric acid addition, and then heat treated at 150 • C/0.5 h in order to potentially induce covalent crosslinking. The viscoelastic storage modulus, E , and tanδ were studied using dynamic mechanical analysis, and compared with neat and neutralized films to elucidate possible crosslinking with citric acid. Films were also prepared with various concentrations of a model crosslinker, glutaraldehyde, both homogeneously and heterogeneously. Based on comparisons of neutralized films with films containing citric acid, and between citric acid films either heat treated or not heat treated, it appeared that the interaction between chitosan and citric acid remained ionic without covalent bond formation. No strong evidence of a glass transition from the tanδ plots was observable, with the possible exception of heterogeneously crosslinked glutaraldehyde films at temperatures above 200 • C.Abstract: Chitosan films containing citric acid were prepared using a multi-step process called heterogeneous crosslinking. These films were neutralized first, followed by citric acid addition, and then heat treated at 150 °C/0.5 h in order to potentially induce covalent crosslinking. The viscoelastic storage modulus, E′, and tanδ were studied using dynamic mechanical analysis, and compared with neat and neutralized films to elucidate possible crosslinking with citric acid. Films were also prepared with various concentrations of a model crosslinker, glutaraldehyde, both homogeneously and heterogeneously. Based on comparisons of neutralized films with films containing citric acid, and between citric acid films either heat treated or not heat treated, it appeared that the interaction between chitosan and citric acid remained ionic without covalent bond formation. No strong evidence of a glass transition from the tanδ plots was observable, with the possible exception of heterogeneously crosslinked glutaraldehyde films at temperatures above 200 °C.Processes 2019, 7, 157 2 of 18 While chitosan films have advantages, such as high anti-microbial and low oxygen-permeability properties [3], their high moisture affinity and relatively poorer mechanical properties compared to common plastics, such as polyethylene terephthalate, low density polyethylene, and polypropylene, limit their packaging applications. The water vapor permeability (WVP) of chitosan films is typically a magnitude higher than that of thermoplastics. Their tensile strength (TS) is in the same range as some plastics; however, their elongation capacities and elastic moduli are lower. A comparison of mechanical and barrier properties of chitosan and plastic films is provided in Table 1.Improving mechanical properties and reducing hydrophilicity of chitosan films has been attempted by several methods, including (i) composite formation with fatty acids [6,7] and other polysaccharides [8], (ii) grafting hydrophobic compounds [9,1...

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Section: Gta-crosslinked Filmsmentioning

confidence: 64%

Section: Film Preparationmentioning

confidence: 99%

Section: Gta-crosslinked Filmsmentioning

confidence: 99%

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Viscoelastic Properties of Crosslinked Chitosan Films

2019

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“…[12] have been employed in the removal of toxic substances from the environment. However, these methods are ineffective in removing most of the dyes molecules and are time-consuming, not cost-effective, and sometimes generate large amount of sludge that are toxic to the biotic organisms in the environment.…”

Section: Introductionmentioning

confidence: 99%

Amphoteric gellan gum-based terpolymer–montmorillonite composite: synthesis, swelling, and dye adsorption studies

Zauro

Vishalakshi

2017

Int J Ind Chem

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A terpolymer gel, Gellan gum-graft-poly(2-acrylamido-2-methyl-1-propanesulfonic acid-co-dimethylaminopropyl methacrylamide) and its composite with the clay, Montmorillonite, was prepared by free-radical polymerization and crosslinking reactions in solution. The terpolymer gel and the clay composite were characterized using FTIR, TGA, SEM, and X-ray diffraction techniques. Swelling studies were carried out in different pH and salt solutions. The gel showed maximum swelling capacity in alkaline medium, while the composite showed higher swelling in neutral medium. The swelling of the gel and the composite followed second kinetics model and water transport is found to be a less Fickian diffusion process. The terpolymer gel and the composite were evaluated for the adsorption of rhodamine B (RhB) and chromotrope 2R (C2R) dyes. Rhodamine B is found to be adsorbed to a higher extent than chromotrope 2R and the adsorption isotherm studies suggested that adsorption of both RhB and C2R on the terpolymer gel was best explained by Langmuir model, while the adsorption on the Composite fitted best into Freundlich model. Similarly, the adsorption kinetics data for both RhB and C2R dyes followed the second-order kinetics.

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“…Accordingly, the components of the composites listed in Table 1 possess hydrophilic character, where chitosan and PVA are among the most hydrophilic components in the composite formulation. A literature report reveals that PVA has a greater swelling contribution than chitosan [45]. For this reason, it is convenient to compare the following samples: (1) according to CHT content (series of three samples in Table 1a/b) and (2) by PVA content (cf.…”

Section: Solvent Swelling Testsmentioning

confidence: 99%

Preparation of Multicomponent Biocomposites and Characterization of Their Physicochemical and Mechanical Properties

2020

Self Cite

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This work focused on a mutual comparison and characterization of the physicochemical properties of three-component polymer composites. Binary polyaniline–chitosan (PANI–CHT) composites were synthesized by in situ polymerization of PANI onto CHT. Ternary composites were prepared by blending with a third component, polyvinyl alcohol (PVA). Composites with variable PANI:CHT (25:75, 50:50 and 75:25) weight ratios were prepared whilst fixing the composition of PVA. The structure and physicochemical properties of the composites were evaluated using thermal analysis (thermogravimetric analysis (TGA), differential scanning calorimetry (DSC)) and spectroscopic methods (infrared (IR), nuclear magnetic resonance (NMR)). The equilibrium and dynamic adsorption properties of composites were evaluated by solvent swelling in water, water vapour adsorption and dye adsorption isotherms. The electrical conductivity was estimated using current–voltage curves. The mechanical properties of the samples were evaluated using dynamic mechanical analysis (DMA) and correlated with the structural parameters of the composites. The adsorption and swelling properties paralleled the change in the electrical and mechanical properties of the materials. In most cases, samples with higher content of chitosan exhibit higher adsorption and mechanical properties, and lower conductivity. Acid-doped samples showed much higher adsorption, swelling, and electrical conductivity than their undoped analogues.

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Investigation of Chitosan-PVA Composite Films and Their Adsorption Properties

Cited by 45 publications

References 19 publications

Viscoelastic Properties of Crosslinked Chitosan Films

Viscoelastic Properties of Crosslinked Chitosan Films

Amphoteric gellan gum-based terpolymer–montmorillonite composite: synthesis, swelling, and dye adsorption studies

Preparation of Multicomponent Biocomposites and Characterization of Their Physicochemical and Mechanical Properties

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