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Diffusion and phase relaxations within the interphase domain of polymer blendlike particles
Author(s) -
Pekcan Önder
Publication year - 1996
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19960118)59:3<521::aid-app18>3.0.co;2-w
Subject(s) - interphase , materials science , methyl methacrylate , diffusion , anthracene , glass transition , analytical chemistry (journal) , annealing (glass) , phase (matter) , polymer , molecule , quenching (fluorescence) , polymer chemistry , chemistry , monomer , fluorescence , thermodynamics , photochemistry , chromatography , organic chemistry , composite material , optics , physics , genetics , biology
A single‐photon counting technique in conjunction with a direct energy transfer (DET) method was used to study the diffusion of small dye molecules within the interphase domain of anthracene (An)‐ and/or phenanthrane (Phe)‐labeled poly(methyl methacrylate) (PMMA) particles sterically stabilized by polyisobutylene (PIB). Mean lifetimes of fluorescing donor molecules were measured during diffusion. A Fickian model for diffusion was employed to fit the experimental data and diffusion coefficients were found to be around 10 −19 and 10 −16 cm 2/s at room and above glass transition temperatures ( T g ) for the corresponding samples, respectively. A reversed Gaussian distribution was detected for the PMMA phase density at the interphase domain. An increased amount of self‐quenching of naphthalene (N) dyes labeled to the PMMA phase was investigated against annealing temperature above T g and the results were attributed to phase relaxations at the interphase domain. © 1996 John Wiley & Sons, Inc.