Confined Assembly in Coaxially Electrospun Block Copolymer Fibers



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The evolution of polystyrene–polyisoprene block copolymer self-assembly is studied in coaxially electrospun nanofibers via annealing. The leftmost image shows the cross-sectional and longitudinal sections of as-spun fibers. Moving to the right, a transition of morphology can be seen from stacked disk structures for lower annealing temperatures to alternating concentric cylinders of polyisoprene and polystyrene for higher annealing temperatures and times.