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Direct non‐radiative energy transfer studies of interdiffusion latex films: Strategies for data analysis
Author(s) -
Winnik Mitchell A.,
Liu Yuan Sheng
Publication year - 1995
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19950920125
Subject(s) - diffusion , radiative transfer , polymer , acceptor , materials science , mixing (physics) , analytical chemistry (journal) , thermodynamics , chemical physics , chemistry , computational physics , physics , optics , chromatography , condensed matter physics , composite material , quantum mechanics
We are interested in studying polymer diffusion across an interface by direct non‐radiative energy transfer. In this paper we examine different approaches and techniques to analyze fluorescence decay data in such systems. One type of technique is used to calculate a parameter f m characterizing the extent of mixing. A second technique allows the concentration profile of the acceptor dyes at the interface to be evaluated. The third technique introduces the diffusion model into the decay profile analysis and yields the diffusion coefficient of the polymers. We found that when characterizing the extent of interdiffusion using the fraction parameter f m , ignorance of the detailed concentration gradient does not introduce significant error. The evaluation of diffusion coefficients is a complicated task due to the broad distribution of polymer molecules in latex films.