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Fast transient fluorescence technique for studying swelling of gels made at various crosslinker contents and exposed to organic vapour
Author(s) -
Erdoǧan M,
Yönel B,
Pekcan Ö
Publication year - 2002
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1013
Subject(s) - swelling , ethylene glycol dimethacrylate , pyrene , methyl methacrylate , materials science , ethylene glycol , polymer chemistry , quenching (fluorescence) , copolymer , fluorescence , polymerization , methacrylate , diffusion , analytical chemistry (journal) , polymer , chemical engineering , chemistry , composite material , chromatography , organic chemistry , thermodynamics , physics , quantum mechanics , engineering , methacrylic acid
Abstract Fast transient fluorescence technique (FTRF) was employed for studying swelling of disc‐shaped poly(methyl methacrylate) (PMMA) gels, which were prepared by free radical copolymerization of methyl methacrylate (MMA) using various ethylene glycol dimethacrylate (EGDM) contents at 60 °C. Pyrene (P) was introduced as a fluorescence probe during polymerization. Swelling experiments were performed by using P‐doped PMMA gels under chloroform vapor. Decay curves of P were measured during in situ swelling experiments. Exponential fits were performed to measure pyrene lifetimes, τ, inside the PMMA gels. It was observed that τ values decreased as swelling proceeded. An equation is derived for low quenching efficiencies to interpret the behaviour of P lifetimes during swelling. The Li–Tanaka equation was used to determine the cooperative diffusion coefficients, D c , for the gels made at various crosslinker contents. It is observed that D c values decrease as the crosslinker content is increased. © 2002 Society of Chemical Industry