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In situ fast transient fluorescence technique (FTRF) to study swelling of gels made of various crosslinker contents
Author(s) -
Erdoǧan M.,
Pekcan Ö.
Publication year - 2002
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.11405
Subject(s) - swelling , ethylene glycol dimethacrylate , copolymer , methyl methacrylate , materials science , polymer chemistry , fluorescence , pyrene , ethylene glycol , quenching (fluorescence) , polymerization , diffusion , radical polymerization , methacrylate , chemistry , polymer , composite material , organic chemistry , thermodynamics , methacrylic acid , physics , quantum mechanics
The fast transient fluorescence technique (FTRF), which uses the strobe master system (SMS), was employed to study the swelling of disc‐shaped PMMA [poly(methyl methacrylate] gels. Seven gels were prepared by free radical copolymerization (FCC) of methyl methacrylate (MMA) with various ethylene glycol dimethacrylate (EGDM) contents. Pyrene (P y ) was introduced as a fluorescence probe during polymerization. After drying these gels, swelling experiments were performed in chloroform at room temperature. P y lifetimes were measured from fluorescence decay traces during the in situ swelling experiments. An equation was derived for low quenching efficiencies to interpret the behavior of lifetimes in the gel during swelling. It was observed that P y lifetimes in the gel decreased as swelling proceeded. The Li–Tanaka equation was used to determine the cooperative diffusion coefficients, D c , which were found to decrease as the crosslinker content was increased. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 87: 464–472, 2003