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The relaxation spectrum of polysiloxane composition - description of an algorithm and sample results

100%

Domaradzki A. , Gałąź R.

1999

tom Vol. 4, no spec.

271-275

The description of an algorithm for predicting the relaxation spectra of polysiloxane compositions is presented in this work. In order to generate optimal values 'lambda'i and Gi to obtain expresion(1), a genetic algorithm and the SVD method were applied.The spectra predicted by these calculations are compared both with the outputs of a professional program, IRIS, and with the experimental results for Polastosil ABM-45.

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

100%

Śmigasiewicz S. , Gałąź R. , Kurcok M.

1999

tom 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.

Polisiloksany-specjalistyczne polimery wykorzystywane w nowoczesnych technologiach

100%

Fejdyś-Kaczmarek M.

2007

tom R. 15, nr 3/4

97-100