Abstract
Thermally induced morphology transition from cylindral to lamellar microdomains was found for a poly(styrene-block-butadiene-block-styrene) (SBS) triblock copolymer having a 0.56 weight fraction of polystyrene blocks by SAXS and TEM. Polybutadiene (PB) cylinders with hexagonal close packing were formed in a polystyrene (PS) matrix when the SBS was cast from a methyl ethyl ketone solution. It was found that the PB cylinders were transformed into lamellae on annealing at 150°C. This is a transition from thermodynamically quasi-stable to stable morphology. The transition turned out to occur via coalescence of cylinders without their translational movements
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