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Anionically prepared block copolymers of butadiene and styrene exhibit solution properties which result from a two‐dimensional ordering of the polymer molecules. The most notable of these properties is the iridescent colors of toluene solutions which are dependent on concentration and abruptly change on mechanical deformation. Electron micrographs of the surface of cast films indicate that the ordered structure is retained to some degree in the solid state.
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Ed Vanzo (1966) studied this question.
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