| Autor: |
V.S. Livshits, V.A. Savin, G.S. Sanina, Ye.B. Lyudvig, A.K. Khomyakov, M.V. Fomina |
| Rok vydání: |
1975 |
| Předmět: |
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| Zdroj: |
Polymer Science U.S.S.R.. 17:3133-3140 |
| ISSN: |
0032-3950 |
| DOI: |
10.1016/0032-3950(75)90344-5 |
| Popis: |
The polymerization of glycolide in a melt containing SbF3 proceeds to 100% conversion in the temperature interval 160–175° and the number of active centres increases with time. The polymerization process features reactions of chain propagation and acyl ion binding by carbonyl groups of the monomer and polymer molecules, as normally occurs with lactones, but an additional feature of this process is the dissociation of ion pairs to free ions. The initial stages of polymerization involve relatively slow initiation with the participation of two initiator molecules. In the light of data on the viscosity of the polyglycolide in the melt the “living” character of the growing chain ends is postulated. A formula is derived which relates the viscosity of polyglycolide in the melt to number-average molecular mass. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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