Thermodynamic characteristics of poly(cyclohexylethylene-b-ethylene- coethylethylene) block copolymers

Ameara S. Mansour, Leah F. Johnson, Timothy P. Lodge, Frank S. Bates

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


A series of poly(cyclohexylethylene-b-ethylene-coethylethylene) (C-E/E E) diblock copolymers containing approximately 50% by volume glassy C blocks and varying fraction (x) of EE repeat units, 0.07 ≤ x ≤ 0.90, was synthesized by anionic polymerization and catalytic hydrogenation. The effects of ethyl branch content on the melt state segment-segment (v) interaction parameter and soft (E/EE) block crystallinity were studied. The percent crystallinity ranged from approximately 30% at x = 0.07 to 0% at about x ≥ 0.30, while the melting temperature changed from 101 °C at x = 0.07 to 44 °C at x = 0.28. Dynamic mechanical spectroscopy was employed to determine the order-disorder transition (ODT) temperatures, from which v was calculated assuming the mean-field prediction ( χNn)ODT = 10.5. Previously published results for the temperature dependent binary interaction parameters for C-E (x = 0.07), C-EE (x = 0.90), and E-EE (x = 0.07 and x = 0.90) fail to account for the quantitative x dependence of χ, based on a simple binary interaction model.

Original languageEnglish (US)
Pages (from-to)566-574
Number of pages9
JournalJournal of Polymer Science, Part B: Polymer Physics
Issue number5
StatePublished - Mar 1 2010


  • Copolymerization
  • Crystallization
  • Diblock copolymers
  • Ethyl branches
  • Polyolefins


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