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

• Autorzy: Śmigasiewicz S. , Gałąź R. , Kurcok M.
• Konferencja: Proceedings of the International Conference on Engineering Rheology ICER '99
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

composition; polysiloxane; rheology; torsion modulus

PL

reologia

• Wydawca: Oficyna Wydawnicza Uniwersytetu Zielonogórskiego
• Czasopismo: Applied Mechanics and Engineering
• Rocznik: 1999
• Tom: Vol. 4, no spec.
• Strony: 319--323
• Opis fizyczny: Bibliogr. 12 poz., wykr.

Twórcy

autor

Śmigasiewicz S.

autor

Gałąź R.

autor

Kurcok M.

• Institute of Chemical Engineering, Polish Academy of Sciences, ul Bałtycka 5, 44-100 Gliwice, POLAND