On the structure of the mesomorphic form of syndiotactic polystyrene

Abstract

In this contribution, the X-ray diffraction (XRD) pattern of a highly oriented sample of syndiotactic polystyrene in the mesomorphic form, collected by an automatic diffractometer, is presented, thus providing quantitative and more complete information relative to the diffracted intensity. The structural changes induced by annealing procedures in mesomorphic samples are shown through the analysis of the XRD patterns: both unoriented and oriented mesomorphic samples are transformed gradually into a-form crystals. On the basis of these evidences and of preliminary comparisons between the calculated Fourier transform of simplified models and the experimental diffraction intensity, it is suggested that the local organization in triplets of transplanar chains, typical of the different modifications of the a-form, would be largely present also in the disordered chain agglomerates of the mesomorphic form. 0 1993, Huthig & Wepf Verlag, Basel CCC 0025-1

Competition between gelation and crystallization in solutions of syndiotactic polystyrene in cis-decalin

“…The pattern is typical for the meso-amodification, described in literature as a zigzag crystalline phase with a very limited ordering, which is usually formed when the amorphous glass of pure sPS is heated just above T g . [20] The FTIR analyses seem to point to the same conformation, thus being also present in the wet state. The formation of this type of structure in solution was only reported up till now by the present authors in the system sPS/cyclohexanol.…”

Polymorphism of syndiotactic polystyrene: γ phase crystallization induced by bulky non-guest solvents

“…For the sake of simplicity, the scheme of Fig. 1 does not enclose the mesomorphic trans planar [25][26][27] and helical [28] phases, which have been also studied in detail.…”

The Cocrystallization Process of Syndiotactic Polystyrene with Photo-Functional Molecules Revealed by PFR Method

“…This diffraction pattern was different from that of SC, namely of sPS/AMC cocrystalline form. Rather the pattern was found to be of a trans planar mesomorphic form [16]. It means the all the AMC molecules of SMA are in the amorphous region.…”