Radikalpolymerisation von methylmethacrylat im gesamten umsatzbereich. Stationäre und instationäre experimente zur bestimmung von wachstums- und abbruchsgeschwindigkeit
✍ Scribed by Sack-Kouloumbris, Regina ;Meyerhoff, Günther
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1989
- Weight
- 763 KB
- Volume
- 190
- Category
- Article
- ISSN
- 0025-116X
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✦ Synopsis
Free-radical polymerization of methyl methacrylate in bulk at 0°C over the full range of conversion is reported. Details for stationary and non-stationary experiments are described allowing to measure both kinetically relevant ratios fk:/k, and k,/k,, f representing radical efficiency, k, rate constant of propagation and k, rate constant of termination. From these ratios the absolute rate constants k, and k, are available. The photochemical decay of the initiator 1,l'-azodicyclohexanenitrile in connection with the rotating-sector technique and observation of the post-effect after stopping the initiator decay were used. The rate of polymerization and the number-and weight-average molar masses were measured. Both, k, and k,, showed a strong dependence on conversion which is well known for k, but is reported here for the first time for k, since Hayden and Melville's determination of k, from measurements of the temperature increase during polymerization were reported.