Statistical Theory of Rubber-Like Elasticity. V. The Stress Birefringence

Abstract
The effects of network formation of non‐Gaussian chains on the stress‐birefringence are calculated. If the birefringence is plotted against the stress, the effects make the curve deviate from a straight line. When it is plotted against the elongation, the curve will rise above that corresponding to independent Gaussian chains in agreement with the experiments.