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<p>Polysaccharide hydrogel films made of chemically crosslinked carboxymethyl cellulose (CMC) were made and characterized to investigate the effect of synthesis temperature on reaction kinetics and material properties. Similar hydrogels have shown potential use in drug delivery, food packaging, and other applications. Synthesis temperature and polymer/crosslinker ratio are shown to significantly effect the properties of the resulting films making these useful tools for tuning the film properties to suit the desired application. CMC was chemically crosslinked with ethylene glycol diglycidyl ether (EGDE) in aqueous solution at synthesis temperatures between 25&#xa0;°C and 60&#xa0;°C and with different CMC/EGDE ratios between 0.47 and 1.42. In-situ rheological measurements were made during the cross-linking reaction to track both the kinetics and final mechanical properties of the hydrogels. Gelation time, rate of gelation, yield strain, elastic modulus, and elongation at break all showed a significant dependence on the synthesis temperature, and ratio of CMC/EGDE. The Flory theory of rubber elasticity was used to estimate the density of crosslinks and porosity of the hydrogels, and FTIR spectroscopy measurements were used to confirm the observed trends. These results indicate the presence of an ‘optimum’ synthesis temperature and CMC/EGDE ratio for the formation of strong, thin films.</p>

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Linking Reaction Kinetics To the Mechanical Properties of Chemically-Crosslinked Carboxymethyl Cellulose Hydrogel Films

  • 期刊论文

  • 发表日期：

    2026年1月12日

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  • Samudra Gupta,
  • Javen Weston

摘要

Polysaccharide hydrogel films made of chemically crosslinked carboxymethyl cellulose (CMC) were made and characterized to investigate the effect of synthesis temperature on reaction kinetics and material properties. Similar hydrogels have shown potential use in drug delivery, food packaging, and other applications. Synthesis temperature and polymer/crosslinker ratio are shown to significantly effect the properties of the resulting films making these useful tools for tuning the film properties to suit the desired application. CMC was chemically crosslinked with ethylene glycol diglycidyl ether (EGDE) in aqueous solution at synthesis temperatures between 25 °C and 60 °C and with different CMC/EGDE ratios between 0.47 and 1.42. In-situ rheological measurements were made during the cross-linking reaction to track both the kinetics and final mechanical properties of the hydrogels. Gelation time, rate of gelation, yield strain, elastic modulus, and elongation at break all showed a significant dependence on the synthesis temperature, and ratio of CMC/EGDE. The Flory theory of rubber elasticity was used to estimate the density of crosslinks and porosity of the hydrogels, and FTIR spectroscopy measurements were used to confirm the observed trends. These results indicate the presence of an ‘optimum’ synthesis temperature and CMC/EGDE ratio for the formation of strong, thin films.