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Suspension copolymerization of vinyl chloride with vinyl acetate initiated by diisopropyl peroxydicarbonate formed in situ

V. Macho, M. Rusina, M. Orságová, and J. Porubsky

Research Institute for Petrochemistry, 972 71 Nováky

 

Abstract:  The kinetics of suspension copolymerization of vinyl chloride (VC) with vinyl acetate (VAC) initiated by diisopropyl peroxydicarbonate formed in situ or outside the medium of copolymerization (or in the absence of VAC) as well as by commercial preparation have been studied. In all cases, the reaction course is governed by a kinetic equation of the first-order reaction. But the rate of copolymerization with the initiator prepared beforehand (in the absence of VAC) or a commercial initiator is more than five times greater than the rate with the initiator prepared in situ. The cause consists mainly in simultaneous consumption of sodium hydroxide for the neutralization of acetic acid and, in particular, saponification of VAC. The kinetics of synthesis of the above initiator as well as mixed initiators show that the reaction time of 20 min is sufficient to obtain a yield of 85—90% at temperatures varying in the range 5—20°C. Afterwards, not only VC but also VAC may be added and copolymerization successfully performed.

Full paper in Portable Document Format: 356a817.pdf

 

Chemical Papers 35 (6) 817–827 (1981)

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