DYNAMIC BIREFRINGENCE OF AMORPHOUS POLYOLEFINS .2. MEASUREMENTS ON POLYMERS CONTAINING 5-MEMBERED RING IN MAIN-CHAIN

Five amorphous polymers are synthesized From five membered cyclic olef ins to examine the strain-induced birefringence and viscoelasticity. T he complex Young's modulus and the complex strain-optical ratio are me asured from the rubbery plateau to the glassy zones of viscoelasticity . The stress-optical coefficients in the rubbery plateau zone, C-R, of the five polyolefins are all positive and very close to each other. T his result means that the value of C-R is relatively insensitive to th e details of molecular structure for this kind of polyolefins. The str ess-optical coefficients in the glassy zone, C-G, of the four polyolef ins which do not contain benzene rings are all negative and small numb ers if compared with those of polymers with the benzene rings.