Clathrate Phases of Styrene/p-Methylstyrene co-Syndiotactic Copolymers

✍ Scribed by Fausta Loffredo; Annamaria Pranzo; Vincenzo Venditto; Pasquale Longo; Gaetano Guerra

• Publisher: John Wiley and Sons
• Year: 2003
• Tongue: English
• Weight: 219 KB
• Volume: 204
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.200390052

✦ Synopsis

Abstract

The possible formation of clathrate phases with several different guest molecules for co‐syndiotactic random copolymers of styrene and p‐methylstyrene has been investigated. In the presence of suitable guests, like carbon disulfide and tetrahydrofuran, clathrate phases are stable for the entire copolymer composition range. However, discontinuous changes between clathrates structurally similar to those observed for syndiotactic polystyrene and syndiotactic poly(p‐methylstyrene) have been observed by wide‐angle X‐ray diffraction and differential scanning calorimetry. Wide copolymer composition ranges of stability have been observed for carbon disulfide/syndiotactic polystyrene and for tetrahydrofuran/syndiotactic poly(p‐methylstyrene) clathrates. A phase diagram including clathrate and crystalline forms of this copolymer system has been presented.

Schematic presentation of along the chain (c axis) projection of packing of the clathrate form of syndiotactic polystyrene including carbon disulfide.

magnified imageSchematic presentation of along the chain (c axis) projection of packing of the clathrate form of syndiotactic polystyrene including carbon disulfide.