Spin-probe ESR studies on nanocomposite polymer electrolytes

Madhurjya M. Borgohain, D. Banerjee, L. Korecz, S. V. Bhat

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The possibility of using spin-probe electron spin resonance (ESR) as a tool to study glass transition temperature, Tg, of polymer electrolytes is explored in 4-hydroxy-2,2,6,6-tetramethylpiperidine-N-oxyl (TEMPOL)-doped composite polymer electrolyte (PEG)46LiClO4 dispersed with nanoparticles of hydrotalcite. The Tg is estimated from the measured values of T50G, the temperature at which the extrema separation 2Azz of the broad powder spectrum decreases to 50 G. In another method, the correlation time sc for the spin probe dynamics was determined by computer simulation of the ESR spectra and Tg has been identified as the temperature at which sc begins to show temperature dependence. While both methods give values of Tg close to those obtained from differential scanning calorimetry, it is concluded that more work is required to establish spin-probe ESR as a reliable technique for the determination of Tg.

Original languageEnglish
Pages (from-to)149-156
Number of pages8
JournalApplied Magnetic Resonance
Volume36
Issue number2-4
DOIs
Publication statusPublished - Oct 29 2009

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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