F. Decandia et al., POLYMORPHISM OF SYNDIOTACTIC POLYSTYRENE - MORPHOLOGY OF THE SOLVENT-INDUCED CRYSTALLINE FORMS, Journal of macromolecular science. Physics, B35(2), 1996, pp. 265-275
The morphology of the delta and gamma forms of syndiotactic polystyren
e (sPS) was investigated using scanning electron microscopy. The cryst
alline forms, delta and gamma, characterized by the chains in helical
conformation, were obtained by solvent-induced crystallization from th
e amorphous glassy polymer. Dichloromethane and acetone were used to o
btain the delta and the gamma form, respectively. The last form was ob
tained by thermal treatments of the delta form, too. The surface of th
e solvent-crystallized samples shows a texture characterized by orient
ed elements and cavities, whereas the internal part is microspheruliti
c in the case of the delta form and is more complex in the gamma form.
At variance, the gamma form obtained by annealing the delta form show
s a much more regular microspherulitic texture.