Scientific Publications of Jos Aerts
Structure and Rheology of Aramid Solutions: Transient Rheological and Rheooptical Measurements
S.J.Picken, J.Aerts, H.L.Doppert, A.J.Reuvers and M.G.Northolt
Macromolecules, 24, 1366-1375 (1991)
Abstract
Some results are presented on the rheology of the lyotropic nematic phase of the aramid
polymers poly(p-phenyleneterephthalamide) and poly(4,4'-benzanilidyleneterephthalamide) in concentrated
sulfuric acid. Controlled-stress and controlled-strain rheometry, polarization microscopy, conoscopy, and
synchrotron X-ray scattering were used to study the change in the structure of the solutions during the
start-up of simple shear flow. The experimental results are discussed in terms of a qualitative model for
the structure of these solutions. The development of orientation during the start-up of flow is explained
by using an affine deformation model.
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