Ordering of lamellar block copolymers on oxidized silane coatings

Mahadevapuram, Nikhila; Mitra, Indranil; Sridhar, Shyam; Strzalka, Joseph; Stein, Gila E.

doi:10.1016/j.eurpolymj.2016.01.010

Ordering of lamellar block copolymers on oxidized silane coatings

Journal Article · Sat Jan 02 00:00:00 EST 2016 · European Polymer Journal

DOI:https://doi.org/10.1016/j.eurpolymj.2016.01.010· OSTI ID:1338963

Mahadevapuram, Nikhila ^[1]; Mitra, Indranil ^[1]; Sridhar, Shyam ^[1]; Strzalka, Joseph ^[2]; Stein, Gila E. ^[1]

Univ. of Houston, Houston, TX (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)

Thin films of lamellar poly(styrene-b-methyl methacrylate) (PS-PMMA) block copolymers are widely investigated for surface patterning. These materials can generate dense arrays of nanoscale lines when the lamellar domains are oriented perpendicular to the substrate. To stabilize this preferred domain orientation, we tuned the substrate surface energy using oxidation of hydrophobic silane coatings. This simple approach is effective for a broad range of PS-PMMA film thicknesses when the oxidation time is optimized, which demonstrates that the substrate coating is energetically neutral with respect to PS and PMMA segments. The lamellar films are characterized by high densities of defects that exhibit a strong dependence on film thickness: in-plane topological defects disrupt the lateral order in ultrathin films, while lamellar domains in thick films can bend and tilt to large misorientation angles. As a result, the types and densities of these defects are similar to those observed with other classes of neutral substrate coatings, such as random copolymer brushes, which demonstrates that oxidized silanes can be used to control PS-PMMA self assembly in thin films.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1338963

Alternate ID(s):: OSTI ID: 1341127

Journal Information:: European Polymer Journal, Journal Name: European Polymer Journal Journal Issue: C Vol. 75; ISSN 0014-3057

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Ordering of lamellar block copolymers on oxidized silane coatings

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