Imaging layers for the directed assembly of block copolymer films: Dependence of the physical and chemical properties of patterned polymer brushes on brush molecular weight
Top-down SEM images of assembled PS--PMMA. The repeat period of the polymer, and is the repeat period of the chemical pattern. The lower molecular weight brush gives better assembly, especially at values far from .
Contact angle of grafted brushes with water. ◼, ● are unmodified brushes, advancing and receding, respectively. ▴, ▾ are oxygen modified brushes, advancing and receding, respectively. Measurements on (a) unannealed and (b) annealed brushes.
(a) Thickness vs molecular weight for unmodified (squares) and oxygen modified (triangles) brushes. (b) Brush grafting density vs molecular weight.
Molecular weight and polydispersity of hydroxy-terminated polystyrene used for polymer brushes.
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