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Interfaces in Self-Assembling Diblock Copolymer Systems: Characterization of Poly(isoprene-b-methyl methacrylate) Micelles in Acetonitrile

Farinha, Jose Paulo S.; Schillén, Karin LU and Winnik, Mitchell A. (1999) In The Journal of Physical Chemistry Part B 103(13). p.2487-2495
Abstract
The kinetics of dipolar nonradiative energy transfer (DET) between dyes confined to the core−corona interface region of poly(isoprene-b-methyl methacrylate) block copolymers (PI−PMMA) in acetonitrile was analyzed using a new distribution model for energy transfer in spherical micelles. The distribution of block junction points was described by the model of Helfand and Tagami (HT) for the strong segregation limit, adapted for the spherical geometry of the core−corona interface. We used this model to analyze experimental fluorescence decay curves for block copolymer micelles made up of polymers containing a donor dye or an acceptor dye covalently attached to the PI−PMMA junction. The analysis yielded an interface thickness between the PI... (More)
The kinetics of dipolar nonradiative energy transfer (DET) between dyes confined to the core−corona interface region of poly(isoprene-b-methyl methacrylate) block copolymers (PI−PMMA) in acetonitrile was analyzed using a new distribution model for energy transfer in spherical micelles. The distribution of block junction points was described by the model of Helfand and Tagami (HT) for the strong segregation limit, adapted for the spherical geometry of the core−corona interface. We used this model to analyze experimental fluorescence decay curves for block copolymer micelles made up of polymers containing a donor dye or an acceptor dye covalently attached to the PI−PMMA junction. The analysis yielded an interface thickness between the PI core and the PMMA corona of δ = (0.9 ± 0.1) nm. In the past, the experimental fluorescence decay curves measured for similar systems have been fitted with the Klafter and Blumen (KB) equation for energy transfer, which has a stretched exponential form. To relate these results to topological characteristics of the system, we simulated donor decay profiles for different interface thickness values using the new distribution model for energy transfer and a modified HT equation. Subsequent analysis by the stretched exponential KB equation proved that the magnitude of the fitted exponent is directly related to the interface thickness between the blocks for a given dye concentration in the core−corona interface. Within a certain range of interface thickness values, this relation can be used to determine the interface thickness from the fitting parameters of the KB equation. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
The Journal of Physical Chemistry Part B
volume
103
issue
13
pages
2487 - 2495
publisher
The American Chemical Society
external identifiers
  • scopus:0001092584
ISSN
1520-5207
DOI
10.1021/jp9843858
language
English
LU publication?
yes
id
b718705d-d1da-4eb3-9040-c169c51f0416 (old id 1736918)
date added to LUP
2010-12-09 17:48:20
date last changed
2017-01-01 07:11:55
@article{b718705d-d1da-4eb3-9040-c169c51f0416,
  abstract     = {The kinetics of dipolar nonradiative energy transfer (DET) between dyes confined to the core−corona interface region of poly(isoprene-b-methyl methacrylate) block copolymers (PI−PMMA) in acetonitrile was analyzed using a new distribution model for energy transfer in spherical micelles. The distribution of block junction points was described by the model of Helfand and Tagami (HT) for the strong segregation limit, adapted for the spherical geometry of the core−corona interface. We used this model to analyze experimental fluorescence decay curves for block copolymer micelles made up of polymers containing a donor dye or an acceptor dye covalently attached to the PI−PMMA junction. The analysis yielded an interface thickness between the PI core and the PMMA corona of δ = (0.9 ± 0.1) nm. In the past, the experimental fluorescence decay curves measured for similar systems have been fitted with the Klafter and Blumen (KB) equation for energy transfer, which has a stretched exponential form. To relate these results to topological characteristics of the system, we simulated donor decay profiles for different interface thickness values using the new distribution model for energy transfer and a modified HT equation. Subsequent analysis by the stretched exponential KB equation proved that the magnitude of the fitted exponent is directly related to the interface thickness between the blocks for a given dye concentration in the core−corona interface. Within a certain range of interface thickness values, this relation can be used to determine the interface thickness from the fitting parameters of the KB equation.},
  author       = {Farinha, Jose Paulo S. and Schillén, Karin and Winnik, Mitchell A.},
  issn         = {1520-5207},
  language     = {eng},
  number       = {13},
  pages        = {2487--2495},
  publisher    = {The American Chemical Society},
  series       = {The Journal of Physical Chemistry Part B},
  title        = {Interfaces in Self-Assembling Diblock Copolymer Systems: Characterization of Poly(isoprene-b-methyl methacrylate) Micelles in Acetonitrile},
  url          = {http://dx.doi.org/10.1021/jp9843858},
  volume       = {103},
  year         = {1999},
}