On the clathrate structures of syndiotactic poly(m-methylstyrene)

The crystal structures of clathrate forms of syndiotactic poly(m‐methylstyrene) containing guest molecules having different steric hindrance (CS2, benzene and orto‐dichlorobenzene) are presented. The structures are all characterized by polymer chains in s(2/1)2 helical conformation and guest molecul...

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Bibliographic Details
Published in:Macromolecular symposia. 2003-10, Vol.203 (1), p.123-130
Main Authors: Tarallo, Oreste, Buono, Annamaria, Califano, Valeria, Petraccone, Vittorio
Format: Article
Language:English
Subjects:
Benzene
Clathrates
Crystal structure
Helical
host-guest system
Polystyrene resins
Steric hindrance
syndiotactic poly(m-methylstyrene)
Syndiotacticity
Unit cell
WAXS
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Summary:The crystal structures of clathrate forms of syndiotactic poly(m‐methylstyrene) containing guest molecules having different steric hindrance (CS2, benzene and orto‐dichlorobenzene) are presented. The structures are all characterized by polymer chains in s(2/1)2 helical conformation and guest molecules packed in an orthorhombic unit cell according to the space group Pcaa. All the presented clathrates belongs to β class indipendently from the dimensions of the guest molecule. In this aspect they differ both from clathrate forms of syndiotactic polystyrene, all belonging to α class, and from clathrate forms of syndiotactic poly(p‐methylstyrene) that belong to α or β class according to the steric hindrance of the guest molecule.
ISSN:1022-1360
1521-3900
DOI:10.1002/masy.200351310