TEMPERATURE-INDUCED STRUCTURAL-CHANGES IN SYNDIOTACTIC POLYSTYRENE CIS-DECALIN SYSTEMS/

Phase transformations in solutions of syndiotactic polystyrene in cis- decalin has been investigated by differential scanning calorimetry, wi de and small angle X-ray scattering, and Fourier transformed infrared spectroscopy. The in-situ performed experiments enabled identification of the different modifications without solvent removal. Quenching a s olution leads to formation of the helical delta-phase. On heating, thi s phase transforms into the planar zigzag beta-phase. The transformati on of the helical phase (delta) into the planar zigzag (beta) during h eating proceeds via a melting-recrystallization process.