Broadband dielectric investigation on 2,6-dihydroxynaphthalene/poly(vinyl ethyl ether) mixtures

Xing Jin, Shihai Zhang, Justin R. Horvath, James Runt

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The relaxation dynamics of mixtures of 2,6-dihydroxynaphthalene and poly(vinyl ethyl ether) (DHN/PVEE), containing 1-20 wt % DHN, were investigated using dielectric relaxation spectroscopy (DRS). A single cooperative segmental relaxation was observed for all mixtures, which shifts to higher temperature and lower frequency upon addition of DHN. All mixtures are amorphous, as established by DSC. The fragility increases with DHN concentration, reflecting the combined contribution of the components. The modification of the DRS relaxation time of the PVEE α process by DHN was evaluated. Together with previously published data, a general feature of the influence of the guest component on the cooperative relaxation dynamics of the host in a miscible binary system becomes apparent: the influence of the guest approaches zero at approximately 60-100°C above the T g of the high T g component, corresponding to the widely recognized critical temperature. The breadths of the α relaxations were found to be independent of temperature and composition. The small DHN molecules closely contact PVEE segments through intermolecular hydrogen bonding, and they are uniformly distributed in the PVEE matrix and have the same effect on all local environments of PVEE. The losses due to ionic conductivity exhibit the same shift factors for the a process in PVEE and all DHN/PVEE mixtures, suggesting that ion transport is highly coupled to the segmental relaxation of the polymer backbone.

Original languageEnglish (US)
Pages (from-to)7681-7687
Number of pages7
JournalJournal of Physical Chemistry B
Volume108
Issue number23
DOIs
StatePublished - Jun 10 2004

Fingerprint

Ethers
ethers
broadband
Dielectric relaxation
Spectroscopy
Ionic conductivity
Relaxation time
Temperature
Hydrogen bonds
Polymers
Ions
shift
Molecules
ethyl vinyl ether
2,6-dihydroxynaphthalene
spectroscopy
ion currents
Chemical analysis
critical temperature
relaxation time

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Jin, Xing ; Zhang, Shihai ; Horvath, Justin R. ; Runt, James. / Broadband dielectric investigation on 2,6-dihydroxynaphthalene/poly(vinyl ethyl ether) mixtures. In: Journal of Physical Chemistry B. 2004 ; Vol. 108, No. 23. pp. 7681-7687.
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abstract = "The relaxation dynamics of mixtures of 2,6-dihydroxynaphthalene and poly(vinyl ethyl ether) (DHN/PVEE), containing 1-20 wt {\%} DHN, were investigated using dielectric relaxation spectroscopy (DRS). A single cooperative segmental relaxation was observed for all mixtures, which shifts to higher temperature and lower frequency upon addition of DHN. All mixtures are amorphous, as established by DSC. The fragility increases with DHN concentration, reflecting the combined contribution of the components. The modification of the DRS relaxation time of the PVEE α process by DHN was evaluated. Together with previously published data, a general feature of the influence of the guest component on the cooperative relaxation dynamics of the host in a miscible binary system becomes apparent: the influence of the guest approaches zero at approximately 60-100°C above the T g of the high T g component, corresponding to the widely recognized critical temperature. The breadths of the α relaxations were found to be independent of temperature and composition. The small DHN molecules closely contact PVEE segments through intermolecular hydrogen bonding, and they are uniformly distributed in the PVEE matrix and have the same effect on all local environments of PVEE. The losses due to ionic conductivity exhibit the same shift factors for the a process in PVEE and all DHN/PVEE mixtures, suggesting that ion transport is highly coupled to the segmental relaxation of the polymer backbone.",
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Broadband dielectric investigation on 2,6-dihydroxynaphthalene/poly(vinyl ethyl ether) mixtures. / Jin, Xing; Zhang, Shihai; Horvath, Justin R.; Runt, James.

In: Journal of Physical Chemistry B, Vol. 108, No. 23, 10.06.2004, p. 7681-7687.

Research output: Contribution to journalArticle

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