F. Decandia et al., PHASE ORGANIZATION OF SOLVENT-CRYSTALLIZED SYNDIOTACTIC POLYSTYRENE FILMS, Journal of macromolecular science. Physics, B33(3-4), 1994, pp. 347-356
Sorption and diffusion of dichloromethane vapor in the helical forms-
that is, delta and gamma-of syndiotactic polystyrene were investigated
. The thermal transition from the delta to the gamma form occurs throu
gh an intermediate mesomorphic form, also characterized by chains in h
elical conformation but lacking true crystalline order. The mesomorphi
c phase was found impermeable to the vapor at low activity, becoming p
ermeable at higher activities. The presence of a mesomorphic phase, al
ong with the crystalline and the amorphous forms, was suggested in the
crystallized samples, too, and its fraction increases greatly going f
rom the delta to the gamma form.