Fast transient fluorescence technique for monitoring swelling of poly(methyl methacrylate) gels

Pekcan O., Kaya D., Erdogan M.

POLYMER, cilt.41, sa.13, ss.4915-4921, 2000 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 41 Sayı: 13
  • Basım Tarihi: 2000
  • Doi Numarası: 10.1016/s0032-3861(99)00721-1
  • Dergi Adı: POLYMER
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.4915-4921
  • Anahtar Kelimeler: poly(methyl metacrylate) gels, fast transient fluorescence technique, swelling, IN-SITU FLUORESCENCE, LATEX FILM FORMATION, ENERGY-TRANSFER, POLYMER COLLOIDS, POLY(VINYL ACETATE), SLOW-RELEASE, DIFFUSION, PARTICLES, KINETICS, COPOLYMERIZATION
  • İstanbul Teknik Üniversitesi Adresli: Evet

Özet

A fast transient fluorescence technique (FTRF) which uses the Strobe Master System (SMS), is introduced for studying swelling of a cylindrical poly(methyl methacrylate) (PMMA) gel. PMMA gel was prepared by free radical copolymerization of methyl (methacrylate) (MMA) and ethylene glycol dimethacrylate (EGDM). Pyrene (P-y) was introduced as a fluorescence probe during polymerization and lifetimes of P-y were measured during in situ swelling process. Chloroform was used as a swelling agent. An equation is derived for low quenching efficiencies to interpret the behavior of mean lifetimes [tau] during swelling. It was observed that [tau] values decreased as swelling proceeded. The Li-Tanaka equation was used to determine the cooperative, D-c and mutual D-m diffusion coefficients, which were found to be around 10(-5) and 10(-7) cm(2) ns(-1), respectively. (C) 2000 Elsevier Science Ltd. All rights reserved.