Effect of SDS on the gelation of hydroxypropylmethylcellulose hydrogels |
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Authors: | J C Su S Q Liu Sunil C Joshi Y C Lam |
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Institution: | (1) School of Mechanical & Aerospace Engineering, Nanyang Technological University, Nanyang Avenue, Singapore, 639798, Singapore |
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Abstract: | Thermal behavior of aqueous hydroxypropylmethylcellulose (HPMC)/surfactant mixtures was studied in the dilute concentration
regime using micro-differential scanning calorimetry (DSC). The surfactant used was sodium n-dodecyl sulfate (SDS). The heat capacity of HPMC gel with various concentrations of SDS was much higher than that of the
pure HPMC gel. The addition of SDS at different concentrations showed dissimilar influences on the gelation of HPMC; SDS at
lower concentrations (≤6 mM) did not affect gelation temperature significantly except for enhancing the heat capacity whilst
SDS at higher concentrations (≥6 mM) not only resulted in the gelation of HPMC at higher temperatures but also changed the
pattern of the gelation thermograph from a single mode to a bimodal. On the basis of the observed thermal behavior of HPMC/SDS
systems, the mechanism behind the sol-gel transition was discussed in terms of the properties of the surfactant and their
influences on the extent of polymer/surfactant binding and polymer/polymer hydrophobic association. Gelation kinetics was
analysed using the results from the DSC measurements. The kinetic parameters were determined. |
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Keywords: | gelation kinetics hydrogel hydrophobic association hydroxypropylmethylcellulose surfactant |
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