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<p>Kinetics, absorption and diffusion mechanism of crosslinked Chitosan Hydrogels</p>

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Title Statement <p>Kinetics, absorption and diffusion mechanism of crosslinked Chitosan Hydrogels</p>
 
Added Entry - Uncontrolled Name Nangia, Sakshi ; Guru Gobind Singh Indraprastha University
Katyal, Deeksha ; University School of Environment Management, Guru Gobind Singh Indraprastha University, New Delhi 110 078, India
Warkar, Sudhir ; Deptt. of Applied Chemistry, Delhi Technological University
 
Uncontrolled Index Term Materials Science
Chitosan, Swelling kinetics, Peppas model, Peleg‟s and Exponential association model
 
Summary, etc. <p style="text-align: justify;">Green polymers are extremely useful for various environmental applications. One such biopolymer is Chitosan. In this study, crosslinked and physical Chitosan hydrogels were synthesized. The swelling of disc-shaped hydrogels crosslinked using different concentrations of Glutaraldehyde were compared with physical film and bead shaped hydrogels. Best swelling of around 3000% was observed in case of square film shaped hydrogels but they lacked rigidity and dissolved in mild acids. In case of crosslinked hydrogels, as the crosslinker concentration increased, the hydrogels entrapped less water but gained better mechanical strength. Characterization of synthesized crosslinked hydrogels was carried out using FTIR, TGA and DSC. Equilibrium swelling results indicated more water absorption at acidic pH (2.5). Simultaneously, increase in temperature led to enhancement of swelling degree. The hydrogels trapped more water leading to increased swelling, in case of lower molar salt concentrations. Second order kinetics was followed due to stress relaxation of polymeric chain. Diffusion was found to be anomalous since exponent values lied between 0.5 and 1. Peleg‟s and Exponential association model were used to carry out absorption modeling. The data was found to fit the Peleg‟s absorption model. Degree of swelling is a major factor for deciding a hydrogels utility. Swelling ability, biocompatibility and availability of lone pairs of oxygen and nitrogen on the surface of CS makes it ideal for applications in drug delivery, controlled release of fertilizers and adsorption of environmental contaminants.</p>
 
Publication, Distribution, Etc. Indian Journal of Engineering and Materials Sciences (IJEMS)
2021-12-03 15:36:49
 
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http://op.niscair.res.in/index.php/IJEMS/article/view/44361
 
Data Source Entry Indian Journal of Engineering and Materials Sciences (IJEMS); ##issue.vol## 28, ##issue.no## 4 (2021): IJEMS-August 2021
 
Language Note en
 
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