چكيده لاتين :
Emulsion polymerization in gas-liquid systems differs from conventional emulsion polymerization. In ethylene-vinyl acetate emulsion polymerization different conditions
of pressure, temperature, and agitation rate affect mass transfer of ethylene monomer to the reaction sites. In this study the effect of scale-up from 1.8 to 7.5 Land several parameters such as agitation rate, initiator concentration, and pressure on copolymer composition and vinyl acetate conversion was investigated. It is found that agitation
rate has a direct effect on mass transfer and participation of monomers especially ethylene monomer in the reaction sites (loci). Vinyl acetate conversion and ethylene content
in vinyl acetate-ethylene copolymers vary with initiator concentration, so that by increasing the initiator concentration, polymerization rate of vinyl acetate monomer increases and ethylene content in the copolymer decreases simultaneously. Decreasing vinyl acetate content of the reaction recipe increases the participation of ethylene in copolymerization. Increase of pressure has a direct effect on this copolymerization system
through increasing solubilization of ethylene monomer which in turn increases ethylene
content in the copolymers. The effect of introducing ethylene into the polymerization reaction was investigated by using glass transition temperature measurements and dilute solution viscometry of the synthesized copolymers.
