LIMA, L. M. R.; http://lattes.cnpq.br/8075219229606935; LIMA, Lenilde Mérgia Ribeiro.
Résumé:
In this work the rheological properties of suspensions of
attapulgite dispersed in an unsaturated polyesther resin were investigated by
means of a Brookfield viscometer. The experiments were conducted at room
temperature (23± 2°C) and atmospheric pressure (= 0,94 atm) for suspension
concentrations of 0, 10, 20, 25, 26, 28 and 30g attapulgite/100 ml polyesther
resin respectively. The rheological properties of these suspensions namely,
shear stress, strain rate, apparent viscosity and power law index were then
determined. The results show that, for the concentration range employed, the
suspensions of attapulgite in polyesther exhibited a Newtonian behaviour, that
is their apparent viscosity remained practically constant for all strain rates
employed and their power law index had values close to one. The
mathemathical models developped by taking into account the Newtonian
characteristics of these suspensions were efficient on describing the
rheological behaviour of the attapulgite/polyesther system investigated.