Abstract
A study was made of the photo-elasticity and of the mechanical properties of cyclolinear polyphenyl-(PPS), polyphenylisobutyl-(PPBS) with phenyl to butyl ratios of 3 : 1, 2 : 1, and 1 : 1, and of poly-3-methylbuten-1-silsesquioxanes (PMBS). In the case of PPBS samples the forced elasticity limit was found to be displaced towards smaller stresses and lower temperatures compared with PPS. A local optical orientation existed in all the samples; they also had a complicated dependence of birefringence ( Δn) on stress ( p). A quantitative evaluation of the degree of orientation present in the anisotropic parts of the films showed it to be two orders of magnitude lower than that of a nematic liquid crystal. A change of orientation in the low stress range (the initial part of the Δn=| ( p) curves) was found to be accompanied by a change of the deformation properties of the samples in the same range of p.
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