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Reordering of polystyrene gel due to multiple swelling in organic vapor: Fast transient fluorescence technique study

Paper ID Volume ID Publish Year Pages File Format Full-Text
28559 44080 2006 7 PDF Available
Title
Reordering of polystyrene gel due to multiple swelling in organic vapor: Fast transient fluorescence technique study
Abstract

Reordering of disc-shaped polystyrene (PS) gels due to multiple swelling, under organic vapor was studied by using Fast Transient Fluorescence (FTRF) technique. Disc-shaped polystyrene gels were prepared by free radical copolymerization (FRC) of styrene (S) with ethylene glycol dimethacrylate (EGDM) as a crosslinker. Pyrene (P) was introduced as a fluorescence probe during polymerization. Swelling experiments were performed by using P doped PS gels under chloroform vapor. After each swelling step, gels were left to dry in an oven at 30 °C for consecutive reswelling experiments. Decay curves of P were measured and pyrene lifetimes, τ, were determined. It was observed that τ values decreased as swelling recycles were repeated. It was observed that after the fifth swelling step, two different regimes appeared in the swelling processes in PS gels. Swelling time constant, τc, and cooperative diffusion coefficients, Dc, were determined by using Li–Tanaka equation for each swelling step in both regimes. It was observed that Dc values decreased up to tenth swelling step and then remained unchanged in both regimes.

Keywords
Reordering; Swelling; Gel; Fast transient fluorescence
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Reordering of polystyrene gel due to multiple swelling in organic vapor: Fast transient fluorescence technique study
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 181, Issues 2–3, 31 July 2006, Pages 394–400
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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