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Probing interphase domains in blend‐like polymer particles by transient fluorescence technique
Author(s) -
Pekcan Önder
Publication year - 1993
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/app.1993.070490118
Subject(s) - interphase , materials science , diffusion , anthracene , quenching (fluorescence) , methyl methacrylate , analytical chemistry (journal) , fluorescence , phase (matter) , polymer , polymer chemistry , chemistry , thermodynamics , photochemistry , monomer , chromatography , composite material , organic chemistry , optics , physics , genetics , biology
Small molecule (1‐naphthylmethyl privalate) (NMP) diffusion into poly (methyl methacrylate) (PMMA) particles sterically stabilized by polyisobutylene (PIB) were studied by the transient fluorescence technique. Mean lifetimes of NMP increased as it diffused into the interphase region indicating that diffusion is accompained by quenching of excited NMP molecules by PIB phase. A delayed Fickian diffusion model is fitted to experimental data and a diffusion coefficient is measured around 10 −19 cm 2 /s at room temperature. PIB density distribution in the interphase domain is found to be Gaussian. A supporting experiment is performed in Anthracene labelled PMMA particles using the direct‐energy transfer method. Reversed Gaussian distribution is detected for the PMMA density in the interphase domain. © 1993 John Wiley & Sons, Inc.