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Anisotropic properties of strained viscoelastic fluids. I. A method for measuring strain birefringence
Author(s) -
Gill Stanley J.
Publication year - 1959
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1959.070010104
Subject(s) - viscoelasticity , birefringence , millisecond , anisotropy , rotation (mathematics) , materials science , relaxation (psychology) , deformation (meteorology) , flow birefringence , tube (container) , mechanics , range (aeronautics) , optics , classical mechanics , physics , composite material , geometry , mathematics , psychology , social psychology , astronomy
A mechanism has been devised for the purpose of introducing a sudden strain of calculable amount into a viscoelastic fluid. The principle of the apparatus relies upon the deformation caused by the rotation of an elliptical sleeve about a flexible tube containing polymer solution. An apparatus has been constructed which can produce a 90° rotation (with consequent deformation) in the period of one millisecond. The detection of the strained state is accomplished by means of strain birefringence. In this way, relaxation can be studied in concentrated solutions for a time range beyond one millisecond.