Abstract
Monomer reactivity ratios in free-radical copolymerization of styrene and 4-vinylpyridine monomers at 80°C in toluene solution under reduced pressure were determined for low and high conversions. Finemann-Ross, Kelen-Tüdös, extended Kelen-Tüdös and Mayo-Lewis methods were used for this purpose. The most reliable method was found to be the extended Kelen-Tüdös method. By the use of this method, for conversions below 20%, monomer reactivity values of 0.700±0.005 and 0.335±0.001 were calculated for 4-vinylpyridine and styrene respectively. For conversions greater than 20%, these values were found to reduce to 0.538±0.004 and 0.277±0.001 respectively.
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