A new method is demonstrated for determining activation energies of microcreep in polymeric filaments. The total activation energy is presented by the generalized form of the Arrhenius rate equation k = A exp (-ΔH RT - ΔF w ). Force-elongation data, which are used to evaluate ΔH and ΔF, are obtained with a constant elongation-rate machine capable of elongating a filament as slowly as 0.1 micron/min and of mea suring force on the filament from 1 to 980 dynes.
Using a filament of 0.018-cm diam, formed by melt extrusion without drawing or thermal decomposition of polystyrene of 45 X 103 molecular weight, ΔH is 60 X 102 cal/g. molecule and ΔF 1.65 X 10-3 ergs/mole.
Get full access to this article
View all access options for this article.
References
1.
Boundy, Ray H. and Boyer, Raymond F., "Styrene" New YorkReinhold Publishing Corp., 1952, p. 578.
