Styrene-butadiene copolymerization initiated by organopotassium compounds in hydrocarbon medium

✍ Scribed by Boris I. Nakhmanovich; Alexander A. Arest-Yakubovich; Tatyana N. Prudskova; Galina I. Litvinenko

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 273 KB
• Volume: 17
• Category: Article
• ISSN: 1022-1336
• DOI: 10.1002/marc.1996.030170105

✦ Synopsis

The following values of monomer reactivity ratios were found: rs = 3,3 f 0,3; rB = 0,12 i 0,02 (cyclohexane, 25 "C). The comparison of the kinetic parameters obtained with Li, Na and K counter-ions shows that the great difference between coordination polymerization with Li and "typically anionic" polymerization with K is mainly determined by the variation of the cross-propagation rate constant kBs with the nature of the counter-ion. No evidences for the specific role of the solvation of Li counter-ion with butadiene monomer were found.