POLARIZED RAMAN-STUDY OF MOLECULAR-ORIENTATION IN UNIAXIALLY STRETCHED ATACTIC POLYSTYRENE

In the reported experiments, polarized Raman intensities have been obtained from thin films of uniaxially oriented atactic polystyrene. The study was made using the 623 cm** minus **1 radial skeletal eta //6//b vibration of the benzene ring. Values of the fourth-order as well as second-order terms in the expansion of the orientation distribution were obtained for draw ratios between 1. 5 and 7. 7. Values for P//2(cos theta ) agree well with the values obtained from infrared dichroism.