Journal Article

PreJuSER-52655

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Physical nature of complex structural relaxation in polysiloxane - PMPTS: alpha and alpha' relaxations

Patkowski, A. ; Gapinski, J. ; Pakula, T. ; Meier, G.FZJ*

2006
Elsevier Science Oxford

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Please use a persistent id in citations: http://hdl.handle.net/2128/585  doi:10.1016/j.polymer.2006.05.065

Abstract: Structural relaxation processes in poly(methyl-para-tolyl-siloxane) (PMpTS) polymers of three molecular weights were studied using dynamic light scattering. Two relaxation processes: the usual alpha and an additional slow one alpha' were observed and studied as function of temperature and molecular weight. Contrary to the structural relaxation, we find that in a plot T-T-g the relaxation times for the alpha', process for all molecular weights do not collapse to a single curve. For one of the samples the light scattering correlation functions were compared with the corresponding functions obtained by means of mechanical relaxation, dielectric spectroscopy and computer simulations. The simulations show that the bimodal distribution, i.e. the alpha relaxation and the slow (a') process are contained in the correlation functions of most of the probes (optical anisotropy, dipole moment, chain bond, density) in agreement with experimental observations. (c) 2006 Elsevier Ltd. All rights reserved.

Keyword(s): J ; amorphous polymers (auto) ; poly(methyl-para-tolyl-siloxane) (auto) ; computer simulation (auto)

Note: Record converted from VDB: 12.11.2012

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Contributing Institute(s):

1. Weiche Materie (IFF-IWM)

Research Program(s):

1. Kondensierte Materie (P54)

Appears in the scientific report 2006
Notes: The definitive version is available at the following Publisher URL: dx.doi.org/10.1016/j.polymer.2006.05.065

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