Absolute online monitoring of a stepwise polymerization reaction: Polyurethane synthesis


Catalgil-Giz H. H. , GIZ A. T. , Alb A. M. , Reed W. F.

JOURNAL OF APPLIED POLYMER SCIENCE, cilt.82, ss.2070-2077, 2001 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 82 Konu: 8
  • Basım Tarihi: 2001
  • Doi Numarası: 10.1002/app.2052
  • Dergi Adı: JOURNAL OF APPLIED POLYMER SCIENCE
  • Sayfa Sayıları: ss.2070-2077

Özet

The feasibility of using a recently introduced method for continuous, absolute online monitoring for step-growth polymerization was demonstrated, and polyurethane synthesis was chosen for the demonstration. The previously reported use of this method was for monitoring free-radical initiated chain-growth polymerization. The technique involves continuously withdrawing a small stream of reaction liquid from the polymerization reactor and pumping it through a series of light scattering and viscosity detectors. This permits the absolute weight-average molecular weight and reduced viscosity to be simultaneously monitored as the reaction proceeds. The final weight-average molecular weights of the polyurethane samples were compared to the separate light scattering measurements of the final products. (C) 2001 John Wiley & Sons, Inc.