Solvent isotope effect on sol-gel transition of methylcellulose studied by DSC

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Abstract

Methylcellulose (MC), a hydrophobically modified cellulose derivative, in an aqueous solution undergoes sol-to-gel and gel-to-sol transitions on heating and cooling, respectively. Using differential scanning calorimetry, MC in light (H2O) and heavy (D2O) water solutions has been investigated to elucidate the solvent isotope effect on the transitions. As a result, their transition temperatures are higher in H2O by about 4 °C than D2O. This phenomenon is rationalized in terms of the strength of the hydrophobic attractive interaction; the strength is enhanced by D2O. We discuss the reason for the enhancement and the difference in the isotope effect between MC and a poly(N-isopropylacrylamide) polymer which shows an opposite trend to MC.

Original languageEnglish
Pages (from-to)1441-1448
Number of pages8
JournalPolymer Bulletin
Volume71
Issue number6
DOIs
Publication statusPublished - Jun 2014

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Polymers and Plastics
  • Materials Chemistry

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