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Temperature dependence of oxygen diffusion into clay‐doped PS films
Author(s) -
Uğur Şaziye,
Yargı Önder,
Pekcan Önder
Publication year - 2010
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.20768
Subject(s) - materials science , arrhenius equation , polystyrene , diffusion , composite number , thermal diffusivity , annealing (glass) , glass transition , oxygen , atmospheric temperature range , analytical chemistry (journal) , quenching (fluorescence) , fick's laws of diffusion , composite material , pyrene , activation energy , fluorescence , polymer , thermodynamics , chemistry , organic chemistry , optics , physics
Fluorescence technique was employed for the measurement of the diffusion coefficient of oxygen into polystyrene (PS) latex/modified Na‐activated bentonite (MNaLB) clay composite films. Three different MNaLB content (0, 5, and 20 wt%) composite films were prepared from PS/MNaLB mixtures by annealing them at 200°C, above the glass transition temperature of PS for 10 min. To determine the diffusivity of oxygen in PS/MNaLB composite films, diffusion measurements were performed over the temperature range from 25 to 70°C. Pyrene (P) was used as the fluorescent agent. The diffusion coefficients ( D ) of oxygen were determined by combining the fluorescence quenching method with Fickian transport model, and were found as a function of temperature for each MNaLB content film. The results showed that D values are strongly dependent on both temperature and clay content in composite film. It was also observed that D coefficients obey Arrhenius behavior, from where diffusion activation energies were measured. POLYM. COMPOS., 2010. © 2009 Society of Plastics Engineers
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