Tricritical points in bimodal polymer solutions

I. Szleifer*, G. Ten Brinke

*Corresponding author for this work

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

The tricritical point of polymer solutions composed by two polymer homologs of different molecular weight in a solvent is studied using the single-chain mean-field theory. The tricritical point is found for a ratio of molecular weights of the two polymers r=N1/N2, which decreases as a function of the short chain length N2 from 51 to approximately 40 for N2 increasing from 1 to 8. This last value is still much larger than the experimentally measured value for mixtures of polystyrene in cyclohexane, where it was found that r≃25. Although a further reduction of r as a function of N2 seems likely, the chain lengths of the corresponding long chains are beyond the reliability limit of the SAW's simulation involved. The addition of a small effective repulsion between the polymer homologs, is found to bring down the predicted value to 25.

Original languageEnglish (US)
Pages (from-to)6343-6347
Number of pages5
JournalJournal of Chemical Physics
Volume104
Issue number16
DOIs
StatePublished - 1996

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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