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, vol.82, no.8, pp.2070-2077, 2001 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 82 Issue: 8
  • Publication Date: 2001
  • Doi Number: 10.1002/app.2052
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.2070-2077
  • Istanbul Technical University Affiliated: Yes


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.