Abstract
The crystal structure of the clathrate δ 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 γ=120° according to the space group P2 1/ a. The crystalline density of the clathrate δ 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 1,2-dichloroethane molecule are such that both chlorine atoms are sandwiched between two benzene rings of the same polymer chain.
Published Version
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