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Vladimir N. Matveenko, Evgeny A. Kirsanov
Rheology
of the melt of polydimethylsiloxane. Structural approach
Abstract
The structural
rheological model is used to describe the rheological properties of SRM 2491
polydimethylsiloxane at various melt temperatures. In root and double logarithmic coordinates, the sections of rheological
curves (,,,) are determined, which correspond to different states of the
structure of the polymer melt. The rheological behavior in the region of low
shear rates and low frequencies of shear oscillations is explained by the
mechanism of the formation and rupture of links between macromolecules under
the action of shear. The temperature dependence of the coefficients of the
rheological equations is explained using the structural-kinetic approach, in
which the rheological properties are directly determined by the state of the
polymer structure.
Key words: rheology, polymer melts, structural rheological model, stationary
shear flow, viscoelastic properties, polydimethylsiloxane
Copyright (C) Chemistry Dept., Moscow State University, 2002
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