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-TiJd6s, extended Kelen-Tfid6s and Mayo-Lewis methods were used for this purpose. The most reliable method was found to be the extended Kelen-Tfid6s 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.
Посилання на статтю:
Monomer reactivity ratios of styrene-4-vinylpyridine copolymers at low and high conversions / Elvan Yilmaz* and Zfihal K/.iqOkyavuzt // Polymer. – 1993. – Vol 34. – P. 145-149.