NDLI: Influence of alkyl chain length on dielectric relaxations in poly(n-alkyl methacrylates)

Content Provider	IEEE Xplore Digital Library
Author	Dudognon, E. Bernes, A. Lacabanne, C.
Copyright Year	2002
Description	Author affiliation: Lab. de Phys. des Polymeres, Univ. Paul Sabatier, Toulouse, France (Dudognon, E.; Bernes, A.; Lacabanne, C.)
Abstract	Relations between chain structure and the dynamic of molecular movements are studied in the glass transition temperature range for a series of amorphous model polymers: the poly(n-alkyl methacrylates). Two dielectric spectroscopies are used in order to enlarge the accessible frequency range: the dynamic dielectric spectroscopy and the thermo-stimulated currents technique. We show the existence of three dipolar relaxation modes: the /spl alpha/ mode assigned to the glass relaxation, the /spl beta/ mode, a secondary relaxation mode, below Tg and the /spl alpha/' mode, above Tg, dielectric manifestation of the liquid-liquid transition. We follow the shift of these relaxations with frequency, determine the behaviour laws of relaxation times and the fine structure of these complex modes. From the comparison of these results, we identify the effect of the alkyl group length on the relaxations and we, propose a phenomenological model to describe the molecular mobility through the glass transition.
Sponsorship	IEEE Dielectrics & Electrical Insulation Soc. IEEE Ultrasonics & Frequency Control Soc
Starting Page	79
Ending Page	82
File Size	312464
Page Count	4
File Format	PDF
ISBN	0780375602
DOI	10.1109/ISE.2002.1042948
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-10-03
Publisher Place	Australia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Glass Electrochemical impedance spectroscopy Frequency Polarization Temperature distribution Dielectric liquids Dielectric materials Polymer films Amorphous materials Dynamic range
Content Type	Text
Resource Type	Article

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