Crystallization in diblock copolymer thin films at different degrees of supercooling.

Solvent-induced novel morphologies in diblock copolymer blend thin films.

We report the morphology and phase behaviors of blend thin films containing two polystyrene-b-poly(methyl methacrylate) (PS-b-PMMA) diblock copolymers with different blending compositions induced by a selective solvent for the PMMA block, which were studied by transmission electron microscopy (TEM). The neat asymmetric PS-b-PMMA diblock copolymers employed in this study, respectively coded as a...

Abstract Submitted for the MAR13 Meeting of The American Physical Society In-situ Grazing-incidence Small-angle X-ray Scattering Study of Diblock Copolymer Thin Films during Solvent Annealing

Submitted for the MAR13 Meeting of The American Physical Society In-situ Grazing-incidence Small-angle X-ray Scattering Study of Diblock Copolymer Thin Films during Solvent Annealing XIAODAN GU, University of Massachusetts Amherst, ILJA GUNKEL, ALEXENDER HEXEMER, Lawrence Berkeley National lab, THOMAS RUSSELL, University of Massachusetts Amherst, UNIVERSITY OFMASSACHUSETTS AMHERST COLLABORATION...

Lateral nanopatterns in thin diblock copolymer films induced by selective solvents.

Block copolymers have long been studied for their theories and applications especially in nanotechnology.1-5 They have periodic structures with 10-100 nm long microphase separated domains which can be controlled by the molecular weight and composition of the block copolymer. Regulating these two parameters, one can prepare thin films with different morphologies over large areas. The patterns fo...

Interfacial profiles of mismatched lamellae in thin diblock copolymer films

Electric Field Induced Sphere-to-Cylinder Transition in Diblock Copolymer Thin Films

An electric field induced sphere-to-cylinder transition in thin films of asymmetric polystyrene-b-poly(methyl methacrylate) diblock copolymers was observed. In the absence of an applied electric field, thin films of the asymmetric diblock copolymer consisted of layers of spherical microdomains with poor in-plane long-range ordering. Under a ∼40V/μm applied electric field, hexagonally packed cyl...