Self-Organization of Triblock Copolymer Melt Chains Physisorbed on Non-neutral Surfaces

Jiang, Naisheng; Di, Xiaoyu; Salatto, Daniel; Nam, Chang -Yong; Fukuto, Masafumi; Endoh, Maya K.; Koga, Tadanori

doi:10.1021/acsomega.8b02912

Title: Self-Organization of Triblock Copolymer Melt Chains Physisorbed on Non-neutral Surfaces

Journal Article · Wed Dec 19 00:00:00 EST 2018 · ACS Omega

DOI:https://doi.org/10.1021/acsomega.8b02912· OSTI ID:1491131

^[1]; Di, Xiaoyu ^[1]; Salatto, Daniel ^[1];

^[2]; Fukuto, Masafumi ^[2]; Endoh, Maya K. ^[1];

^[1]

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

In this study, we report the self-organization process of poly(styrene-b-ethylene/butadiene-b-styrene) (SEBS) triblock copolymer chains physically adsorbed on a non-neutral surface. Spin-cast SEBS thin films were prepared on silicon (Si) substrates and then annealed at a high temperature far above the bulk glass transition temperatures of the two constituent blocks. To reveal the buried interfacial structure, we utilized solvent rinsing processes and a suite of surface-sensitive techniques including ellipsometry, X-ray reflectivity, atomic force microscopy, and grazing incidence small angle X-ray scattering. We revealed that the SEBS chains form two different chain structures on the substrate simultaneously: (i) “flattened chains” with the average height of 2.5 nm but without forming microdomain structures; (ii) “loosely adsorbed chains” with the average height of 11.0 nm and the formation of perpendicularly oriented cylindrical microdomains to the substrate surface. In addition, the kinetics to form the perpendicular-oriented cylinder was sluggish (~200 h) and proceeded via multistep processes toward the equilibrium state. We also found that the lateral microdomain structures were distorted, and the characteristic lengths of the microdomains were slightly different from the bulk even after reaching “quasiequilibrium” state within the observed time window. Furthermore, we highlight the vital role of the adsorbed chains in the self-assembling process of the entire SEBS thin film: a long-range perturbation associated with the adsorbed chains propagates into the film interior, overwhelming the free surface effect associated with surface segregation of the lower surface tension of polystyrene blocks.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

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

Grant/Contract Number:: SC0012704

OSTI ID:: 1491131

Report Number(s):: BNL-210870-2019-JAAM

Journal Information:: ACS Omega, Vol. 3, Issue 12; ISSN 2470-1343

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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Title: Self-Organization of Triblock Copolymer Melt Chains Physisorbed on Non-neutral Surfaces

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