Crystal structure of the clathrate delta form of syndiotactic polystyrene containing 1,2-dichloroethane

Citation
C. De Rosa et al., Crystal structure of the clathrate delta form of syndiotactic polystyrene containing 1,2-dichloroethane, POLYMER, 40(8), 1999, pp. 2103-2110
Citations number
20
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
POLYMER
ISSN journal
00323861 → ACNP
Volume
40
Issue
8
Year of publication
1999
Pages
2103 - 2110
Database
ISI
SICI code
0032-3861(199904)40:8<2103:CSOTCD>2.0.ZU;2-1
Abstract
The crystal structure of the clathrate delta form of syndiotactic polystyre ne containing 1,2-dichloroethane is presented. Polymer chains in s(2/1)2 he lical conformation and 1,2-dichloroethane molecules are packed in the monoc linic unit cell with axes a = 17.11 Angstrom, b = 12.17 Angstrom, c = 7.70 Angstrom and gamma = 120 degrees according to the space group P2(1)/a. The crystalline density of the clathrate delta form is 1.23 g cm(-3) with two c hains (eight monomer units) and two I,2-dichloroethane molecules inside the unit cell. Molecules of 1,2-dichloroethane occupy isolated cavities betwee n the benzene rings of adjacent polymer chains and are essentially only in the trans conformation. The location and the conformation of the 1,2-dichlo roethane molecule are such that both chlorine atoms are sandwiched between two benzene rings of the same polymer chain. (C) 1999 Elsevier Science Ltd. All rights reserved.