Untersuchungen zur radikalischen Homo‐ und Copolymerisation von Vinylacetat und n‐Butylacrylat

Abstract

Die radikalische Homo-und Copolymerisation von Vinylacetat und n-Butylacrylat in Methanol bei 70 "C wurde untersucht. Die Bruttogeschwindigkeitskonstanten der Homopolymerisation beider Monomere in Abhangigkeit von der Azobisisobutyronitril-Konzentration wurden bestimmt. Fur die Vinylacetat-Butylacrylat-Copolymerisation wurden die Copolymerisationsparameter in Abhangigkeit von der Initiatorkonzentration und vom Ausgangsverhaltnis der Monomerkonzentrationen ermittelt. Die Ergebnisse unterscheiden sich von Literaturdaten. Die mittels NMR-Spektroskopie ermittelten Mikrostrukturparameter der Copolymere zeigen eine Abhangigkeit von der Reaktionszeit. Mccaedoeanua padum.mnoC zomononuntepuaayuu u conoau~epu3ayuu eununaqemama Hccneaosanocb p a A m a m H a a r o M o n o n H M e p H a a q H a H c o n o n t i~e p~3 a q~a B m m n a q e TThe radical homo-and copolymerization of vinyl acetate and n-butyl acrylate in methanol a t 70°C was investigated. The rate constants of homopolymerization of both monomers in dependence on the concentration of azobisisobutyronitrile were determined. The vinyl acetatebutyl acrylate copolymerization parameters have been determined in dependence on the initiator concentration and the starting concentration relations of the monomers. They differ from data in literature. By means of NMR spectroscopy the microstructure of the copolymers was determined, which exhibits dependence on the time of reaction.

Effect of Solvent on the Rate Constants in Solution Polymerization III. Butyl Acrylate/Vinyl Acetate

“…In addition to these data, other studies have gone further and explicitly explored the effects of reaction conditions (aside from temperature) on kinetic parameters. Heublein et al 6 reported values of reactivity ratios that varied significantly as a function of both initiator concentration (rBuA=3.3 and rvAc=0.47 at 0.25% AIBN by weight, and 2.6 and 0.24 at 1% by weight) and V Ac: BuA in the initial change (rBuA=2.6 and rvAc=0.24 with VAc: BuA=l:l, and rBuA=0.34 and rvAc=l.7 with VAc: BuA = 10 : 1 ). In a separate work, Dube and Penlidis 7 discussed the kinetics of the terpolymerization system BuA/MMA/V Ac in bulk and in toluene solutions, and presented values on the evolution of the molecular weight 8 distribution (MWD).…”