Effect of carbon dioxide sorption on the phase behavior of weakly interacting polymer mixtures: Solvent-induced segregation in deuterated polybutadiene/polyisoprene blends

Vijayakumar S. Ramachandrarao, Bryan D. Vogt, Ravi R. Gupta, James J. Watkins

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

The effect of carbon dioxide (CO2) sorption on the lower critical solution temperatures of deuterated polybutadiene/polyisoprene blends was determined with in situ small-angle neutron scattering. CO2 was a poor solvent for both polymers and exhibited very weak selectivity between the blend components. The sorption of modest concentrations of CO2, at pressures up to 160 bar, induced phase segregation at temperatures well below the binary-phase-separation temperature and caused an increased asymmetry in the lower critical solution temperature curve. The origin of solvent-induced phase segregation in this weakly interacting polymer blend system was attributed predominantly to an exacerbation of the existing disparity in the compressibility of the components upon CO2 sorption.

Original languageEnglish (US)
Pages (from-to)3114-3126
Number of pages13
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume41
Issue number23
DOIs
StatePublished - Dec 1 2003

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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