Bulk polymerization of polyurethane under high pressure
Article first published online: 10 MAR 2003
Copyright © 1990 John Wiley & Sons, Inc.
Journal of Applied Polymer Science
Volume 39, Issue 3, pages 639–647, 5 February 1990
How to Cite
Park, K. C. and Kim, S. C. (1990), Bulk polymerization of polyurethane under high pressure. J. Appl. Polym. Sci., 39: 639–647. doi: 10.1002/app.1990.070390314
- Issue published online: 10 MAR 2003
- Article first published online: 10 MAR 2003
- Manuscript Accepted: 23 NOV 1988
- Manuscript Received: 17 NOV 1988
The pressure effect on the reaction kinetics, molecular weight, and the microphase separation of the soft and hard segment of the polyurethane, synthesized under high pressure, was studied. The polymerization rate increased with increasing synthesis pressure and the activation energy of polymerization decreased with increasing synthesis pressure from 22.4 kcal/mol at 1 kg/cm2 to 19.4 kcal/mol at 3000 kg/cm2. The volume of activation of the polyurethane polymerization was −19.8 cm3/mol at 60°C. Microphase separation between soft and hard segment decreased with increasing synthesis pressure and increased with increasing synthesis temperature. Molecular weight and molecular weight distribution were not influenced by the synthesis pressure.