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Title: Substrate Surface Energy Dependent Morphology and Dewetting in an ABC Triblock Copolymer Film

Abstract

A gradient combinatorial approach was used to examine the effect of substrate surface energy on the morphology and stability of films of a poly(isoprene-b-styrene-b-ethylene oxide) triblock copolymer that exhibits an alternating gyroid morphology in the bulk. Atomic force microscopy data across our surface energy (water contact angle) library suggest a transformation to predominantly surface parallel lamellae with an antisymmetric ordering. For substrate water contact angles below 70{sup o} the film exhibited autophobic dewetting from an adsorbed half-period triblock copolymer monolayer at longer annealing times. X-ray photoelectron spectroscopy and near edge X-ray absorption fine structure analysis along gradient specimens indicated that the substrate surface energy governed the composition profile of the monolayer, and this variation in chemical expression was key to whether the film was stable or autophobically dewet. These observations demonstrate that enthalpic interactions, in addition to entropic considerations, can play a major role in autophobic dewetting of block copolymer films.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
930342
Report Number(s):
BNL-81055-2008-JA
Journal ID: ISSN 0743-7463; LANGD5; TRN: US200904%%522
DOE Contract Number:
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Langmuir; Journal Volume: 23
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COPOLYMERS; FILMS; SURFACE PROPERTIES; WETTABILITY; SUBSTRATES; MORPHOLOGY; POLYISOPRENE; POLYETHYLENE GLYCOLS; POLYSTYRENE; national synchrotron light source

Citation Formats

Epps,T., DeLongchamp, D., Fasolka, M., Fischer, D., and Jablonski, E.. Substrate Surface Energy Dependent Morphology and Dewetting in an ABC Triblock Copolymer Film. United States: N. p., 2007. Web. doi:10.1021/la062707q.
Epps,T., DeLongchamp, D., Fasolka, M., Fischer, D., & Jablonski, E.. Substrate Surface Energy Dependent Morphology and Dewetting in an ABC Triblock Copolymer Film. United States. doi:10.1021/la062707q.
Epps,T., DeLongchamp, D., Fasolka, M., Fischer, D., and Jablonski, E.. Mon . "Substrate Surface Energy Dependent Morphology and Dewetting in an ABC Triblock Copolymer Film". United States. doi:10.1021/la062707q.
@article{osti_930342,
title = {Substrate Surface Energy Dependent Morphology and Dewetting in an ABC Triblock Copolymer Film},
author = {Epps,T. and DeLongchamp, D. and Fasolka, M. and Fischer, D. and Jablonski, E.},
abstractNote = {A gradient combinatorial approach was used to examine the effect of substrate surface energy on the morphology and stability of films of a poly(isoprene-b-styrene-b-ethylene oxide) triblock copolymer that exhibits an alternating gyroid morphology in the bulk. Atomic force microscopy data across our surface energy (water contact angle) library suggest a transformation to predominantly surface parallel lamellae with an antisymmetric ordering. For substrate water contact angles below 70{sup o} the film exhibited autophobic dewetting from an adsorbed half-period triblock copolymer monolayer at longer annealing times. X-ray photoelectron spectroscopy and near edge X-ray absorption fine structure analysis along gradient specimens indicated that the substrate surface energy governed the composition profile of the monolayer, and this variation in chemical expression was key to whether the film was stable or autophobically dewet. These observations demonstrate that enthalpic interactions, in addition to entropic considerations, can play a major role in autophobic dewetting of block copolymer films.},
doi = {10.1021/la062707q},
journal = {Langmuir},
number = ,
volume = 23,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}