Spontaneous perpendicular orientation of cylindrical microdomains in a thick film of block copolymers

Micropore extrusion-induced alignment transition from perpendicular to parallel of cylindrical domains in block copolymers.

The orientation transition from perpendicular to parallel alignment of PEO cylindrical domains of PEO-b-PMA(Az) films has been demonstrated by extruding the block copolymer (BCP) solutions through a micropore of a plastic gastight syringe. The parallelized orientation of PEO domains induced by this micropore extrusion can be recovered to perpendicular alignment via ultrasonication of the extrud...

Three-dimensional multilayered nanostructures with controlled orientation of microdomains from cross-linkable block copolymers.

Three-dimensional (3D) nanostructures were obtained by the directed formation of multilayer block copolymer (BCP) thin films. The initial step in this strategy involves the assembly and cross-linking of cylinder-forming polystyrene-b-poly(methyl methacrylate) (PS-b-PMMA) BCP, in which 1.5 mol % of reactive azido (-N(3)) groups were randomly incorporated along the styrene backbone. Significantly...

Bending of Lamellar Microdomains of Block Copolymers on Nonselective Surfaces

Symmetric diblock copolymers self-assemble into lamellar microdomains which can be used to create line and space patterns on substrates by controlling the orientation of microdomains. Previously, it has been reported that the orientation of lamellar microdomains can be controlled perpendicular to the surface by modifying the substrate surface to become nonselective to each domain. For practical...

Orientation of self-assembled block copolymer cylinders perpendicular to electric field in mesoscale film

an investigation of the types of text reduction in subtitling: a case study of the persian film gilaneh with english subtitles

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