6533b858fe1ef96bd12b5705
RESEARCH PRODUCT
Radikalpolymerisation von methylmethacrylat im gesamten umsatzbereich. Stationäre und instationäre experimente zur bestimmung von wachstums- und abbruchsgeschwindigkeit
Regina Sack‐kouloumbrisG. Meyerhoffsubject
Reaction ratechemistry.chemical_compoundMolar massReaction rate constantBulk polymerizationPolymerizationChemistryRadical polymerizationPolymer chemistryAbsolute rateMethyl methacrylatedescription
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/ka and kw/ka, f representing radical efficiency, kw rate constants of propagation and ka rate constant of termination. From these ratios the absolute rate constants kw and ka are available. The photochemical decay of the initiator 1,1′-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, kw and ka, showed a strong dependence on conversion which is well known for ka but is reported here for the first time for kw since Hayden and Melville's determination of kw from measurements of the temperature increase during polymerization were reported.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1989-05-01 | Die Makromolekulare Chemie |