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Viscoelastic behaviour of polysiloxane - based compositions over a wide frequency and temperature range

Śmigasiewicz S., Gałąź R., Kurcok M.

Applied Mechanics and Engineering

1999

Vol. 4, no spec.

319-323

Dynamic, torsion mechanical studies of two polysiloxane based compositions, Polastosil ABM45 and R-P, in wide frequency (0.2 - 100 Hz) and temperature (-140 - 0oC) ranges and for linear range of strain amplitude ('gamma' = 0.2 %) are presented. The observed G'- minima, near -90oC, magnitudes of which are a decreasing function of frequency proved to be the manifestation of some reversible kinetic transition to a more ordered, crystalline structure .The enthalpy of activation for that transition was estimated to be of the order of 19 kJ/mole. On the basis of DSC measurements the average number of links between polymer chains formed during the crystalization was found to be within the range of 120 - 600, depending on the preliminary cooling rate.