Gel Swelling Induced by Organic Vapors; Fast Transient Fluorescence StudyClick to copy article linkArticle link copied!
Abstract
Fast transient fluorescence technique (FTRF) which uses Strobe Master System (SMS) was used to study swelling of disk-shaped poly(methyl methacrylate) (PMMA) gels. Disk-shaped PMMA gels were prepared by free-radical copolymerization of methyl (methacrylate) (MMA) and ethylene glycol dimethacrylate (EGDM). Pyrene (P) was introduced as a fluorescence probe during polymerization, and lifetimes of P were measured during in-situ swelling process. Various organic solvents were used for vapor-induced gel swelling. An equation is derived for low-quenching efficiencies to interpret the behavior of lifetimes, τ during swelling. It was observed that τ values decreased as swelling proceeded. Li−Tanaka equation was used to determine the cooperative diffusion coefficients, Dc, which were around 10-5 cm2 s-1.
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, 2609-2679. https://doi.org/10.1039/C6CS00895J
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