Solvent isotope effect on gelation process of methylcellulose studied by NMR and DSC

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Abstract

The gelation process of methylcellulose (MC) in light (H2O) and heavy (D2O) waters was investigated using NMR and DSC to elucidate solvent isotope effect on the process. As temperature is raised, MC chains in both solvents undergo the aggregation and subsequent gelation; however, their onset temperatures are lower in D2O than H2O. This demonstrates that D2O enhances the hydrophobic attractive force, which is the driving force for the aggregation and gelation. We propose that the excluded volume effect of the hydrophobic segments in MC chains should play a pivotal role for the enhancement, while, prior to the above investigation, chemical shift assignments of proton and carbon resonances are performed, and six resonances are newly assigned.

Original languageEnglish
Pages (from-to)4245-4255
Number of pages11
JournalPolymer Bulletin
Volume75
Issue number9
DOIs
Publication statusPublished - Sep 1 2018

All Science Journal Classification (ASJC) codes

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

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