Fast transient fluorescence (FTRF) technique for monitoring free-radical crosslinking copolymerization (FCC) of styrene (S) with various divinylbenzene (DVB) contents


Pekcan O., Kaya D.

POLYMER, cilt.42, sa.18, ss.7865-7871, 2001 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 42 Sayı: 18
  • Basım Tarihi: 2001
  • Doi Numarası: 10.1016/s0032-3861(01)00231-2
  • Dergi Adı: POLYMER
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.7865-7871
  • Anahtar Kelimeler: fluorescence, lifetimes, gelation, MOLECULAR-SIZE DISTRIBUTION, METHYL-METHACRYLATE, NETWORK FORMATION, PYRENE, GELATION, ENERGY, TRANSITION, DIFFUSION
  • İstanbul Teknik Üniversitesi Adresli: Evet

Özet

The gelation during free-radical crosslinking copolymerization (FCC) of styrene (S) and commercial divinylbenzene (DVB) in bulk was studied using Fast Transient Fluorescence (FTRF) technique. Pyrene (Py) was used as a fluorescence probe for the FTRF experiments. Fluorescence lifetimes of Py from its decay traces were measured and used to monitor the gelation processes in various DVB contents. Styrene consumption rates were measured during gelation process employing Stem-Volmer kinetic model. Composite rate constants, k(r) were determined for each DVB content experiments and it is observed that as DVB is increased k(r) increases. (C) 2001 Elsevier Science Ltd. AU rights reserved.