Influence of charge placement on the thermal and morphological properties of sulfonated segmented copolyesters

Musan Zhang, Mingqiang Zhang, Robert B. Moore, Timothy E. Long

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

A new synthetic strategy using melt transesterification enabled selective control of ionic charge placement into the hard segment or soft segment block of segmented copolyesters. Dynamic mechanical analysis of sulfonated soft segment copolyesters revealed an increase in the low-Tg transition and rubbery plateau storage modulus as a function of sulfonation level. Sulfonated hard segment copolyesters displayed similar rubbery plateau moduli and decreasing flow temperature from 145 to 90 C. Dynamic melt rheology and in situ, variable temperature small-angle X-ray scattering determined the non-sulfonated copolyester order-disorder transition at 150 ± 5 C, which was ∼60 C above the hard segment Tg. Atomic force microscopy revealed sulfonated hard segment copolyesters contained more disordered surface morphologies. Sulfonated soft segment copolyesters demonstrated increased tensile stress and improved tensile strain from 18 to 170% with increasing ion content. The enhanced mechanical performance of sulfonated soft segment was attributed to the preserved microphase-separated morphology and the presence of physical crosslinks from electrostatic interactions.

Original languageEnglish (US)
Pages (from-to)3521-3528
Number of pages8
JournalPolymer
Volume54
Issue number14
DOIs
StatePublished - Jun 21 2013
Externally publishedYes

Keywords

  • Melt polycondensation
  • Polyesters
  • Segmented block copolymers

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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