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Comparison of dissolution and mutual diffusion coefficients during dissolution of poly(methyl methacrylate) films
Author(s) -
Uğur Ş,
Pekcan Ö
Publication year - 1999
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(199906)48:6<485::aid-pi175>3.0.co;2-8
Subject(s) - dissolution , methyl methacrylate , quenching (fluorescence) , diffusion , pyrene , materials science , polymer , fluorescence , heptane , analytical chemistry (journal) , molecule , polymerization , polymer chemistry , chemistry , organic chemistry , thermodynamics , composite material , optics , physics
Steady state fluorescence measurements have been used for studying the dissolution of polymer films. These films are formed by free radical polymerization of methyl methacrylate (MMA) in which pyrene ( P y ) was introduced as a fluorescence probe. Dissolution of poly(methyl methacrylate) (PMMA) films in chloroform–heptane mixtures were monitored in real‐time by the P y fluorescence intensity change. Dissolution coefficients D d of P y molecules were measured during dissolution of PMMA films, and found to be about 10 −6 cm 2 s −1 . After dissolution, fluorescence quenching measurements were performed and the Stern–Volmer equation was employed to measure the mutual diffusion coefficients of heptane ( D h ) and P y ( D Py ) molecules; these were found to be about 10 −5 cm 2 s −1 . © 1999 Society of Chemical Industry