Rapid Ordering in “Wet Brush” Block Copolymer/Homopolymer Ternary Blends

Doerk, Gregory S.; Yager, Kevin G.

doi:10.1021/acsnano.7b06154

Title: Rapid Ordering in “Wet Brush” Block Copolymer/Homopolymer Ternary Blends

Journal Article · 30 November 2017 · ACS Nano

DOI: https://doi.org/10.1021/acsnano.7b06154 · OSTI ID:1413958

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Brookhaven National Lab. (BNL), Upton, NY (United States)

The ubiquitous presence of thermodynamically unfavored but kinetically trapped topological defects in nanopatterns formed via self-assembly of block copolymer thin films may prevent their use for many envisioned applications. Here, we demonstrate that lamellae patterns formed by symmetric polystyrene-block-poly(methyl methacrylate) diblock copolymers self-assemble and order extremely rapidly when the diblock copolymers are blended with low molecular weight homopolymers of the constituent blocks. Being in the “wet brush” regime, the homopolymers uniformly distribute within their respective self-assembled microdomains, preventing increases in domain widths. An order-of-magnitude increase in topological grain size in blends over the neat (unblended) diblock copolymer is achieved within minutes of thermal annealing as a result of the significantly higher power law exponent for ordering kinetics in the blends. Moreover, the blends are demonstrated to be capable of rapid and robust domain alignment within micrometer-scale trenches, in contrast to the corresponding neat diblock copolymer. Furthermore, these results can be attributed to the lowering of energy barriers associated with domain boundaries by bringing the system closer to an order–disorder transition through low molecular weight homopolymer blending.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States). Center for Functional Nanomaterials

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0012704

OSTI ID:: 1413958

Report Number(s):: BNL--114813-2017-JA; KC0403020

Journal Information:: ACS Nano, Journal Name: ACS Nano Journal Issue: 12 Vol. 11; ISSN 1936-0851

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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77 NANOSCIENCE AND NANOTECHNOLOGY
Center for Functional Nanomaterials
block copolymer
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directed self-assembly
homopolymer
pattern transfer
ternary blends

Title: Rapid Ordering in “Wet Brush” Block Copolymer/Homopolymer Ternary Blends

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