| Autor: |
Nysenko, Z. N., Berman, E. L., Ludvig, E. B., Ponomarenko, V. A. |
| Zdroj: |
Journal of Macromolecular Science, Part A: Pure and Applied Chemistry; August 1976, Vol. 10 Issue: 6 p1093-1116, 24p |
| Abstrakt: |
The kinetics of polymerization of 1, 3-dioxolane (DiOX) initiated by (C2H5)3O+SbCl6 and SbCl5 has been studied and the elementary stages of the process have been considered. The polymerization of DiOX by (C2H5)3O+SbCl6-is shown to proceed at a steady rate to high conversion. A constant concentration of active centers in the system is maintained due to the equal rates of decomposition of active centers and disproportionation. The nonsteady-state character of DiOX polymerization initiated by SbCl5is associated with a relatively lower stability of the counter-ion SbCl5 OR- compared with SbCl6. The initiation of DiOX polymerization by (C2H5)3O+SbCl6 proceeds without hydride-transfer reactions, and the concentration of active centers in the system is determined not by processes taking place in the initiation stage, but by the existence of a definite kind of equilibrium with the participation of active centers. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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