Phase Diagrams for Binary Polymer Systems Exhibiting both Crystallization and Limited Liquid—Liquid Miscibility

W. R. Burghardt*

*Corresponding author for this work

Research output: Contribution to journalArticle

85 Scopus citations

Abstract

Equilibrium phase diagrams have been calculated for binary polymer solutions and blends exhibiting both crystallinity and limited liquid-liquid miscibility, using Flory—Huggins solution thermodynamics. The interaction of crystallization and liquid demixing results in a monotectic phase structure. Phase diagrams calculated for polymer solutions agree well with published experimental observations, such as small shifts in the crystal melting curve despite large variations in the solvent quality. Consideration of the free energy of mixing curve indicates that liquid-liquid phase separation may play a role in determining crystal morphology, even when there is no liquid-liquid equilibrium in the phase diagram. A phase diagram incorporating both monotectic and eutectic phase structures may result from a solution of polymer in a high-melting poor solvent. Phase diagrams calculated for immiscible binary blends indicate only negligible melting point depression over most of the composition range.

Original languageEnglish (US)
Pages (from-to)2482-2486
Number of pages5
JournalMacromolecules
Volume22
Issue number5
DOIs
StatePublished - Sep 1 1989

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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