The crystal structure of the clathrate d form of syndiotactic polystyrene containing 1,2-dichloroethane is presented. Polymer chains in s(2/ 1)2 helical conformation and 1,2-dichloroethane molecules are packed in the monoclinic unit cell with axes a 17.11 Å, b 12.17 Å, c 7.70 Å and g 120° according to the space group P21/a. The crystalline density of the clathrate d form is 1.23 g cm ⫺3 with two chains (eight monomer units) and two 1,2-dichloroethane molecules inside the unit cell. Molecules of 1,2-dichloroethane occupy isolated cavities between the benzene rings of adjacent polymer chains and are essentially only in the trans conformation. The location and the conformation of the 1,2dichloroethane molecule are such that both chlorine atoms are sandwiched between two benzene rings of the same polymer chain.
Посилання на статтю:
Crystal structure of the clathrate d form of syndiotactic polystyrene containing 1,2-dichloroethane / Claudio De Rosa, Paola Rizzo, Odda Ruiz de Ballesteros, Vittorio Petraccone, Gaetano Guerra // Polymer. – 1999. – N 40. – P. 2103–2110.