Dynamics of reactive polymer networks in the presence of a nonpolar solvent by dielectric relaxation spectroscopy

Saša Andjelić, Jovan Mijovic

Research output: Contribution to journalArticle

Abstract

An investigation was carried out on the dynamics of polymer networks in the presence of a nonpolar solvent. The formulations studied were composed of a network-forming multifunctional epoxyamine mixture and o-terphenyl as solvent. A number of formulations at various degrees of cross-linking and with different solvent concentration were prepared and investigated. Experimental results were generated by simultaneous broad-band dielectric relaxation spectroscopy and remote fiber-optic Fourier transform infrared spectroscopy. The emergence of specific interactions during the network formation was confirmed by FTIR and their effect on the dynamics of the α process was established. Dielectric data were analyzed in the time and frequency domain, and it was found that the network dynamics could be classified into three regimes as a function of degree of cure. The nature of relaxations in these three regimes was discussed. An interesting finding was that the dynamics were dominated by the short-range interactions in the vicinity of the gel point. The presence of solvent had a pronounced effect on the various aspects of dynamics, including the apparent activation energy for the a process, the distribution function, and the cooperative nature of relaxations.

Original languageEnglish (US)
Pages (from-to)2872-2882
Number of pages11
JournalMacromolecules
Volume31
Issue number9
StatePublished - May 5 1998

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Functional polymers
Dielectric relaxation
Spectroscopy
Fiber optics
Distribution functions
Fourier transform infrared spectroscopy
Polymers
Gels
Activation energy

ASJC Scopus subject areas

  • Materials Chemistry

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Dynamics of reactive polymer networks in the presence of a nonpolar solvent by dielectric relaxation spectroscopy. / Andjelić, Saša; Mijovic, Jovan.

In: Macromolecules, Vol. 31, No. 9, 05.05.1998, p. 2872-2882.

Research output: Contribution to journalArticle

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