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Molecular Relaxation of the Side Groups in Poly(vinyl alcohol) Films in GHz Frequency Range

Published online by Cambridge University Press:  16 March 2015

Siva Kumar-Krishnan ,
Olimpia L. Arias de Fuentes ,
Evgen Prokhorov ,
Araceli Mauricio‐Sanchez ,
Moisés Oviedo Mendoza  and
Gabriel Luna-Barcenas
Siva Kumar-Krishnan
Affiliation:
Cinvestav del IPN, Unidad Querétaro, Libramiento Norponiente 2000, Querétaro, QRO 76230, MEXICO.
Olimpia L. Arias de Fuentes
Affiliation:
Cinvestav del IPN, Unidad Querétaro, Libramiento Norponiente 2000, Querétaro, QRO 76230, MEXICO.
Evgen Prokhorov
Affiliation:
Cinvestav del IPN, Unidad Querétaro, Libramiento Norponiente 2000, Querétaro, QRO 76230, MEXICO.
Araceli Mauricio‐Sanchez
Affiliation:
Cinvestav del IPN, Unidad Querétaro, Libramiento Norponiente 2000, Querétaro, QRO 76230, MEXICO.
Moisés Oviedo Mendoza
Affiliation:
Cinvestav del IPN, Unidad Querétaro, Libramiento Norponiente 2000, Querétaro, QRO 76230, MEXICO.
Gabriel Luna-Barcenas
Affiliation:
Cinvestav del IPN, Unidad Querétaro, Libramiento Norponiente 2000, Querétaro, QRO 76230, MEXICO.
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Abstract

Poly(vinyl alcohol) (PVA) is a synthetic polymer which has been used in a wide variety of applications. This polymer has been extensively investigated by a large number of techniques to shed light about its physical and chemical properties. In this work, for fist time, high frequency (1x109-3x109 Hz) relaxation process has been observed in the PVA films in the temperature range of -100C to +1200C. This relaxation exhibits negative activation energy below glass transition temperature Tg and at higher temperature positive activation energy with subsequent saturation. Upon cooling the activation energy was negative again. This high frequency relaxation process and its temperature dependence can be attributed to the interaction of the bounded water and the changes of energy and freedom of movement of OH side molecular chains groups. This conclusion has been supported by in situ FTIR measurements. A possible scenario of this relaxation and dynamics of molecular motion has been proposed.

Keywords

dielectric propertieselectrical propertiespolymer
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1767: Symposium 5C – New Trends in Polymer Chemistry and Characterization , 2015 , pp. 75 - 80
Copyright
Copyright © Materials Research Society 2015 

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References

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