Influence of cyclobutane segments in cycloaliphatic decahydronaphthalene-containing copolyesters

Joseph M. Dennis, Nicole A. Fazekas, Ryan J. Mondschein, Ramesh Ramakrishnan, Sergei Nazarenko, Timothy E. Long

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


Melt transesterification polycondensation enabled the incorporation of rigid, cycloaliphatic diols (2,2,4,4-tetramethylcyclobutane-1,3-diol) into decahydronaphthalene-containing copolyesters, which resulted in amorphous, optically clear materials. Glass transition temperatures approached 155°C and followed predictable trends using the Fox equation for randomly sequenced copolymers. Dynamic mechanical analysis identified several low-temperature relaxations attributed to the complex motions of the decahydronaphthalate and cyclohexyl rings within the polymer backbone. Furthermore, incorporating cyclobutane rings suppressed the low-temperature local mobility, revealing a strong structural dependence on these relaxations. The rheological simplicity of these nonassociating chains permitted analysis over a large frequency window using time-temperature superposition. As a result, the characteristic relaxation times provided insight into chain dynamics and the propensity for chain entanglements. Finally, positron annihilation lifetime spectroscopy probed hole-free volume and reinforced the trends observed with oxygen permeability measurements.

Original languageEnglish (US)
Pages (from-to)750-756
Number of pages7
JournalHigh Performance Polymers
Issue number6
StatePublished - Aug 1 2017
Externally publishedYes


  • BPA-replacement
  • PALS
  • Polyester
  • free volume
  • naphthalene

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry


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