Abstract
AbstractMolecular motion in a polymeric system can be studied using dynamic birefringence. Computer interfacing of the dynamic birefringence apparatus and the data treatment using Fourier analysis are reported in this paper. Experiments are done under sinusoidal strain; stress, strain and birefringence signals are monitored. Birefringence is measured using the optical transmission technique. An AIM‐65 microcomputer was interfaced with this apparatus for the purposes of data acquisition and data analysis. First‐order Fourier coefficients are used to determine the real and imaginary components of the modulus, the strain optical coefficient, and the stress optical coefficient. Higher order Fourier coefficients can be used to study the nonlinear viscoelastic behavior in the polymer.
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