Structural Rearrangements in a Lamellar Diblock Copolymer Thin Film during Treatment with Saturated Solvent Vapor

Structural Rearrangements in a Lamellar Diblock Copolymer Thin Film during Treatment with Saturated Solvent Vapor

We have investigated the structural changes in thin films of lamellar poly(styrene-b-butadiene) diblock copolymers during treatment with saturated cyclohexane vapor, a solvent slightly selective for polybutadiene. Using real-time, in situ grazing-incidence small-angle X-ray scattering (GISAXS), the...

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Veröffentlicht in:Macromolecules 2010-01, Vol.43 (1), p.418-427
Hauptverfasser: Di, Zhenyu, Posselt, Dorthe, Smilgies, Detlef-M, Papadakis, Christine M
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Sprache:eng
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Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Structure, morphology and analysis
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container_end_page 427
container_issue 1
container_start_page 418
container_title Macromolecules
container_volume 43
creator Di, Zhenyu
Posselt, Dorthe
Smilgies, Detlef-M
Papadakis, Christine M
description We have investigated the structural changes in thin films of lamellar poly(styrene-b-butadiene) diblock copolymers during treatment with saturated cyclohexane vapor, a solvent slightly selective for polybutadiene. Using real-time, in situ grazing-incidence small-angle X-ray scattering (GISAXS), the swelling and the rearrangement of the lamellae were investigated with a time resolution of a few seconds, and the underlying processes on the molecular level were identified. After a few minutes in vapor, a transient state with higher degree of lamellar order and orientation was encountered. Additional parallel lamellae formed which we attribute to the increased degree of coiling of the polymers in the swollen state. Eventually, the film became disordered. These changes are attributed to the increased mobility of the swollen polymers, and the gradually decreasing segment−segment interaction parameter in the film as solvent is absorbed.
doi_str_mv 10.1021/ma9017795
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subjects Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Structure, morphology and analysis
title Structural Rearrangements in a Lamellar Diblock Copolymer Thin Film during Treatment with Saturated Solvent Vapor
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