Molecular relaxation in cross-linked poly(ethylene glycol) and poly(propylene glycol) diacrylate networks by dielectric spectroscopy

Sumod Kalakkunnath, Douglass S. Kalika, Haiqing Lin, Roy D. Raharjo, Benny D. Freeman

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23 Citations (Scopus)

Abstract

The molecular relaxation characteristics of rubbery amorphous crosslinked networks based on poly(ethylene glycol) diacrylate [PEGDA] and poly(propylene glycol) diacrylate [PPGDA] have been investigated using broadband dielectric spectroscopy. Dielectric spectra measured across the sub-glass transition region indicate the emergence of an intermediate "fast" relaxation in the highly crosslinked networks that appears to correspond to a subset of segmental motions that are more local and less cooperative as compared to those associated with the glass transition. This process, which is similar to a distinct sub-Tg relaxation detected in poly(ethylene oxide) [PEO], may be a general feature in systems with a sufficient level of chemical or physical constraint, as it is observed in the crosslinked networks, crystalline PEO, and PEO-based nanocomposites.

Original languageEnglish
Pages (from-to)579-589
Number of pages11
JournalPolymer
Volume48
Issue number2
DOIs
Publication statusPublished - 12 Jan 2007
Externally publishedYes

Keywords

  • Dielectric spectroscopy
  • Membranes
  • Poly(ethylene oxide)

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