Sound velocity and loss factor of polyurethane composites. Part I.

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Authors

  • W. BANDERA Laboratory of Applied Acoustics and Spectroscopy, Gdańsk University, Poland
  • K. PAWLACZYK Institute of Chemical Technology, Technical University of Szczecin, Poland

Abstract

The paper reports development of elastic, unfoamed polyurethane compositions to be used as vibro-insulating materials. The examined compositions were prepared using poly(propylenoethers) of different molecular weights, toluylene diisocyanate and glass microspheres separated from fly-ashes. The effect of varied proportions of components on visco-elastic properties of the material, that is on sound velocity and loss factor was examined experimentally. The measurements were taken at room temperature within frequency range of 20Hz to 1000Hz. It was discovered that modification of the polyurethane binder content and alteration of the number of microspheres in a composition permit modification of properties of the material and especially its stiffness and internal damping.

References

[1] W. BANDERA, K. PAWLACZYK, Wpływ zawartości mikrosfer na właściwości lepkosprężyste poliuretanowej pianki syntaktycznej. Prace XXXV OSA, Białowieża – Warszawa 1988, t. 1, 102-107.

[2] W. BANDERA, K. PAWLACZYK, Właściwości lepkosprężyste poliuretanowej pianki syntaktycznej, Archiwum Nauki o Materiałach, 11, 3-4, 243 (1990).

[3] A. BŁĘDZKI, M. ŁOSIEWICZ, A. KWASEK, Mikrosfery jako napełniacze kompozycji polimerowych cz. I, Polimery, 30 (4), 154 (1985).

[4] I. L. BUCHANAN, Numerical solution for the dynamic moduli of a viscoelastic bar, Journal of Acoustical Society of America, 81 (6), 1775 (1987).