Critical Exponents of Thermal Phase Transitions of kappa-Carrageenan in Various Salt Solutions

Tari O., Pekcan O.

48th Microsymposium on Polymer Colloids - From Design to Biomedical and Industrial Applications, Prague, Çek Cumhuriyeti, 20 - 24 Temmuz 2008, cilt.281, ss.160-167 identifier identifier

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Cilt numarası: 281
  • Doi Numarası: 10.1002/masy.200950721
  • Basıldığı Şehir: Prague
  • Basıldığı Ülke: Çek Cumhuriyeti
  • Sayfa Sayıları: ss.160-167
  • İstanbul Teknik Üniversitesi Adresli: Evet

Özet

The steady state fluorescence (SSF) technique was employed to study the phase transitions Of kappa-carrageenan in NaCl and KCl solutions. Pyranine was used as a fluorescence probe for monitoring these transitions. Scattered light, I(sc), and fluorescence intensity, 1, was monitored against temperature to determine transition temperatures and exponents. It was observed that transition temperatures are strongly correlated with the NaCl and KCl contents. The weight-average degree of polymerization, DP(w) and gel fraction G, exponents (gamma and beta) were measured and found to be in accord with the classical Flory-Stockmayer model.