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Rheological changes for urethane polymerizations in bulk and in solution |
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| Authors: | Yein-Ming Lee LJames Lee |
| Affiliation: | Department of Chemical Engineering, The Ohio State University, Columbus, Ohio 43210, USA |
| Abstract: | Viscosity rise and extent of reaction were followed during the step growth polymerization of linear and branched urethanes in bulk and in solution. Results indicate that intra-molecular reaction may exist in both linear and branched systems. Adding solvent increases the extent of intra-molecular reaction. The system viscosity was found to correlate with CgMw, where C is polymer concentration, g is the ratio of branched to linear polymer radii of gyration, and Mw is the weight-average molecular weight. |
| Keywords: | urethane polymerization viscosity rise gelation intra-molecular reaction linear and branched systems solution polymerization bulk polymerization |
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