Excellent control of the thin-film microdomain orientation of lamellar- (LAM) and cylinder- (CYL) forming ultrahigh molecular weight block copolymers has been obtained over a large area via directional solidification of a crystallizable solvent. 3D optical imaging of the microdomains via laser scanning confocal microscopy (see figure) directly show an intriguing orientation of the intermaterial dividing surfaces (IMDSs).
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