FOURIER-TRANSFORM INFRARED SPECTROSCOPIC STUDY OF CONFORMATION OF FREEZE-DRIED ISOTACTIC POLYSTYRENE

Isotactic polystyrene samples were prepared by shock-cooling and subse quent freeze-drying from very dilute solutions in benzene. Fourier tra nsform infrared spectroscopic studies on these samples indicated that there are conformational differences between them and a normal isotact ic polystyrene. Comparison of the infrared spectra indicated that spec tral changes occurred at the bands near 1261, 1085-1050, 982, 923-906, and 550 cm(-1) The changes in intensities of the crystalline bands sh ow that the freeze-dried isotactic polystyrene from a very dilute solu tion exhibits a higher crystallinity than the annealed sample.