An energy transfer study of homopolymer localization in block copolymers

[en] We have investigated the localization of homopolystyrene (hPS) in its blends with poly(styrene-b-butyl methacrylate) (PS-b-PBMA), at 140 degreesC, measuring the quantum efficiency of direct energy transfer (Phi(ET) of DET) between hPS randomly labeled with phenanthrene moieties and PS-b-PBMA labeled at the junction with anthracene. The molecular weight of hPS was similar to the molecular weight of the PS block of PS-b-PBMA, and the hPS content was kept to a maximum of 26 vol %, to preserve the lamellar morphology of PS-b-PBMA. We have found very low rates of DET, which implies that hPS is almost totally localized between the PS brushes of PS-b-PBMA. In addition to the experimental measurements, we also calculated Phi(ET) values by simulating fluorescence decay curves, based on Vavasour and Whitmore's numerical self-consistent-field (NSCF) formalism. The latter theory confirmed that we were dealing with a "dry brush" situation, but the NSCF results suggested a higher level of penetration of hPS than the experiments. We attribute this discrepancy to uncertainties about inputs to the simulations, particularly the Flory-Huggins chi parameter and the Kuhn length for the PBMA block.

Research Center/Unit :

Center for Education and Research on Macromolecules (CERM)

Disciplines :

Chemistry
Materials science & engineering

Author, co-author :

Rharbi, Yahya; University of Toronto, Canada > Department of Chemistry

Zhang, Jian-Xin; University of Toronto, Canada > Department of Chemistry

Spiro, John G; University of Toronto, Canada > Department of Chemistry

Chen, Liusheng; University of Toronto, Canada > Department of Chemistry

Winnik, Mitchell A; University of Toronto, Canada > Department of Chemistry

Vavasour, J. D.; Memorial University of Newfoundland, Canada > Department of Physics and Physical Oceanography

Whitmore, M. D.; Memorial University of Newfoundland, Canada > Department of Physics and Physical Oceanography

Jérôme, Robert ; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)

Language :

English

Title :

An energy transfer study of homopolymer localization in block copolymers

Publication date :

25 February 2003

Journal title :

Macromolecules

ISSN :

0024-9297

eISSN :

1520-5835

Publisher :

Amer Chemical Soc, Washington, United States - Washington

Volume :

Issue :

Pages :

1241-1252

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://pubs.acs.org/doi/pdf/10.1021/ma020962l

Funders :

BELSPO - Politique scientifique fédérale
NSERC - Natural Sciences and Engineering Research Council

Available on ORBi :

since 18 March 2009

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