Amorphous copolyesters based on bibenzoic acids and neopentyl glycol

Hans Eliot Edling, Ryan J. Mondschein, Mark K. Davis, Timothy E. Long, Sam Richard Turner

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

High Tg amorphous copolyester thermoplastics were synthesized by incorporating 4,4′-bibenzoate (4,4′BB) and 3,4′-bibenzoate moieties into the polyester backbone via melt polycondensation. The high levels of crystallinity typically associated with 4,4′BB containing polyesters were suppressed through copolymerization of ethylene glycol, 1,4-cyclohexane dimethanol, and neopentyl glycol (NPG) diols. NPG was shown to be highly effective in suppressing crystallization and was used to produce amorphous compositions with Tg’s as high as 129 °C. Diol ratios were determined by 1H NMR spectroscopy and molecular weights were assessed with inherent viscosity (ηinh). Thermogravimetric analysis showed single-step weight losses in the range of 395–419 °C. Differential scanning calorimetry was used to determine melting points and glass transition temperatures over a wide range of copolyester compositions and identified amorphous compositions. Dynamic mechanical analysis confirmed Tg’s and was used to study β-relaxations below the Tg. Rheological analysis revealed the effect of NPG structures on shear thinning and thermal stability.

Original languageEnglish (US)
Pages (from-to)579-587
Number of pages9
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume57
Issue number5
DOIs
StatePublished - Mar 1 2019
Externally publishedYes

Keywords

  • amorphous
  • bibenzoate
  • calorimetry
  • cyclohexanedimethanol
  • neopentyl glycol
  • polyester
  • rheology

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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