Spreading of Block Copolymer Films and Domain Alignment at Moving Terrace Steps

Details Spreading of Block Copolymer Films and Domain Alignment at Moving Terrace Steps Spreading of Block Copolymer Films and Domain Alignment at Moving Terrace Steps

2003-09-11

arxiv.org/abs/cond-mat/0309294v1

Physics

Condensed Matter

Soft Condensed Matter

11 pages, 7 figures, submitted to J. Chem. Phys

Scientific paper

10.1063/1.1647521

We investigate spreading of phase separated copolymer films, where domain walls and thickness steps influence polymer flow. We show that at early stages of spreading its rate is determined by slow activated flow at terrace steps (i.e. thickness steps). At late stages of spreading, on the other hand, the rate is determined by the flow along terraces, with diffusion-like time dependence $t^{-1/2}$. This dependence is similar to de Gennes and Cazabat's prediction for generic layered liquids, as opposed to the classical Tanner's law of drop spreading. We also argue that chain hopping at the spreading terrace steps should lead to the formation of aligned, defect-free domain patterns on the growing terraces.

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