Effects of annealing under pressure on the polymorphic behaviour of crystalline syndiotactic polystyrene (sPS) have been investigated using X-ray diffraction and d.s.c, thermal methods, sPS exhibited the normal crystalline form when annealed at atmospheric pressure, but transforms to the/~ form when annealed at higher pressures. A planar zigzag chain conformation was retained after the pressure-induced ~ to /~ transition and the molecular chains packed more densely in the lateral direction.
Посилання на статтю:
Crystallization of syndiotactic polystyrene under pressure / Z. Sun, R. J. Morgan and D. N. Lewis // Polymer. – 1992. – Vol 33. – P. 660-661.