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Dynamics of Poly(vinyl butyral) by Dielectric Spectroscopy and 1H NMR Relaxometry

Abstract

Dielectric Spectroscopy (DS) and 1H Fast Field-Cycling (FFC) NMR relaxometry were applied for understanding the dynamic behavior of the amorphous ter-polymer poly(vinyl butyral) (PVB) across the glass transition temperature (Tg=70 °C by Differential Scanning Calorimetry). Above Tg, main chain segmental motions (α relaxation) were detected and characterized by both DS and FFC NMR relaxometry. The correlation times extracted by the analysis of DS and FFC NMR relaxometry data agreed within a factor of three and showed a Vogel Fulcher Tammann temperature dependence, with an associated Tg of 69 °C and a fragility of 155 for PVB glass. Below Tg, a secondary process (β relaxation) was revealed by DS, and was ascribed to reorientations of the vinyl alcohol dipoles due to local twisting motions with an associated activation barrier of 11 kcal/mol. The β process was also found to contribute to 1H NMR relaxation above Tg.

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Publication details

The article was received on 20 Apr 2017, accepted on 12 Nov 2017 and first published on 13 Nov 2017


Article type: Paper
DOI: 10.1039/C7CP02595E
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    Dynamics of Poly(vinyl butyral) by Dielectric Spectroscopy and 1H NMR Relaxometry

    S. Pizzanelli, D. Prevosto, M. Labardi, T. Guazzini, S. Bronco, C. Forte and L. Calucci, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP02595E

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