Molecular weight effect on polymer dissolution: a steady state fluorescence study

Pekcan O., Ugur S.

POLYMER, cilt.43, sa.6, ss.1937-1941, 2002 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 43 Sayı: 6
  • Basım Tarihi: 2002
  • Doi Numarası: 10.1016/s0032-3861(01)00757-1
  • Dergi Adı: POLYMER
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.1937-1941
  • İstanbul Teknik Üniversitesi Adresli: Hayır

Özet

In situ steady state fluorescence (SSF) technique was used to study the dissolution of disc-shaped polymer glasses in various molecular weights, M-W. The glass discs were formed by free-radical polymerization of methyl methacrylate (MMA). Pyrene (P) was introduced during polymerization as a fluorescence probe to monitor the dissolution process in chloroform. Desorption of poly(methyl methacrylate) (PMMA) chains from discs were monitored simultaneously by observing the change of P fluorescence intensity, I. Diffusion model with a moving boundary was employed to quantify the fluorescence data observed from dissolving PMMA discs made at various molecular weights. It is observed that desorption coefficient, D decreased by increasing molecular weight, M-W by obeying D approximate to M-1 law. (C) 2002 Elsevier Science Ltd. All rights reserved.