Application of thermal blob theory to intrinsic viscosity measurements of poly(4-chlorostyrene) above the theta point

YILMAZ F., BAYSAL B.

JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS, cilt.34, sa.10, ss.1789-1793, 1996 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 34 Sayı: 10
  • Basım Tarihi: 1996
  • Dergi Adı: JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.1789-1793
  • Yıldız Teknik Üniversitesi Adresli: Evet

Özet

Macromolecular chains obey purely Gaussian statistics close to the theta temperature. An asymptotic regime is also reached far above the theta point. Thermal blob theory permits an approximate calculation of thermal expansion factor. In this theory, an adjustable pa rameter is used as a prefactor (A*N-1) in order to calculate the reduced blob parameter (Nl N-c). In this work, we proposed a different approach to evaluate (A*N-1) by plotting tau M(omega)(1/2)/alpha(eta)(5) against tau M(omega)(1/2). Chain expansion data of poly(4-chlorostyrene) in various solvents is used to evaluate viscosity expansion factors at various temperatures. It seems that predictions of thermal blob theory provide a better fit to experimental points rather than those evaluations based on Flory-type approaches. (C) 1996 John Wiley & Sons, Inc.