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Cyclic polysiloxanes: 6. Dielectric relaxation of polymethylphenylsiloxanes

Goodwin, Andy A. ; Beevers, Martin S. ; Clarson, Stephen J. ; Anthony Semlyen, J.

Polymer (Guilford), 1996-06, Vol.37 (13), p.2597-2602 [Periódico revisado por pares]

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Título:
Cyclic polysiloxanes: 6. Dielectric relaxation of polymethylphenylsiloxanes
Autor: Goodwin, Andy A. ; Beevers, Martin S. ; Clarson, Stephen J. ; Anthony Semlyen, J.
Assuntos: Applied sciences ; dielectric relaxation ; dipole moment ; Exact sciences and technology ; Inorganic and organomineral polymers ; Physicochemistry of polymers ; polymethylphenylsiloxane ; Properties and characterization
É parte de: Polymer (Guilford), 1996-06, Vol.37 (13), p.2597-2602
Descrição: The dielectric α-relaxation of a series of linear polymethylphenylsiloxanes (PMPSs) has been investigated as a function of frequency in the temperature range 155.5–262 K. The breadth of the relaxation process, according to the empirical Kohlrausch-Williams-Watts and Havriliak-Negami functions, increases as the molecular weight increases. The apparent activation energy passes through a maximum at nn= 10 which reflects the contribution of the whole molecule rotation to dipolar relaxation. A maximum in the dipole moment ratio occurs at nn∼ 50 due to dipole reinforcement. A similar investigation of a cyclic PMPS with nn= 10 indicates the effectiveness of dipolar cancellation in small siloxane rings.
Editor: Oxford: Elsevier Ltd
Idioma: Inglês

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