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          Institute: MPI für Polymerforschung     Collection: MPI Polymerforschung     Display Documents



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ID: 59745.0, MPI für Polymerforschung / MPI Polymerforschung
Effect of volume changes on segmental relaxation in siloxane polymers
Authors:Paluch, M.; Casalini, R.; Patkowski, A.; Pakula, Tadeusz; Roland, C. M.
Language:English
Date of Publication (YYYY-MM-DD):2003-09
Title of Journal:Physical Review E
Journal Abbrev.:Phys. Rev. E
Volume:68
Issue / Number:3
Sequence Number of Article:031802
Review Status:not specified
Audience:Not Specified
Abstract / Description:From dielectric relaxation and equation-of-state measurements on polymethylphenylsiloxane and polymethyltolylsiloxane, the relative contributions of volume and thermal energy to the temperature dependence of the segmental relaxation times are quantified. In both polymers, volume exerts a substantial effect, being almost as significant as thermal energy. A possible consequence of this prominent role of volume in governing the segmental dynamics is the finding that the relaxation times, measured for a series of temperature at various (fixed) pressures, can be expressed as a single function of the volume normalized by the volume at the glass transition temperature. A similar result is found for the (isothermal) relaxation times measured at various pressures.
Comment of the Author/Creator:Date: 2003, SEP
External Publication Status:published
Document Type:Article
Affiliations:MPI für Polymerforschung
External Affiliations:Silesian Univ, Inst Phys, PL-40007 Katowice, Poland.; George Mason Univ, Dept Chem, Fairfax, VA 22030 USA.; Adam Mickiewicz Univ Poznan, Inst Phys, PL-61614 Poznan, Poland.; USN, Div Chem, Res Lab, Washington, DC 20375 USA.
Identifiers:ISI:000185756000055 [ID No:1]
ISSN:1063-651X [ID No:2]
LOCALID:P-03-206
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