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Abstract
Isotactic polystyrene (IPS) solution crystals have been benzoylated in heterogeneous medium. By this method, a multi-block copolymer was obtained. The discussed benzoylated IPS crystals (BzIPS) show similar gelation properties as pure isotactic polystyrene. It is proved that the crystalline cross-links in the gel of the BzIPS polymers are formed by the IPS segments which formed the crystalline core in the original IPS solution crystals. These fringed micellar crystals do not show the familiar 3 1 helical structure of IPS. The proposal is made that at low temperature IPS as well as BzIPS can crystallize in two different crystal structures. A suggestion is made that the formation of the new structure of IPS may be the origin of some anomalies in BzIPS and IPS crystallization at large undercoolings e.g. crystallization rate and annealing behaviour.
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