Copolymerization of ethylene and vinyl acetate at low pressure. Determination of the kinetics by sequential sampling

Monomer reactivity ratios in ethylene-vinyl acetate copolymn. at 62.deg. and 33.9 atm were detd. to be 0.746 +- 0.005 and 1.515 +- 0.007, resp., by sequential sampling of monomer feed, quant. gas chromatog., and computer calcn. based on nonlinear least-squares metho

High-conversion emulsion polymerization

The four important factors that det. the rate of emulsion polymn. are the propagation rate coeff., the latex-particle concn., the monomer concn. in the latex particles, and the free-radical concn. in the latex particles. Both theor. considerations and exptl. evidence suggested that the important factors that reduced the rate of emulsion polymn. at high conversion were the propagation rate coeff. and the monomer concn. in the latex particles, and not the free-radical concn. in the latex particle, if the initiator was not depleted. Various approaches for increasing the rate of emulsion polymn. at high conversion were suggeste

Encapsulation of inorganic filler particles by emulsion polymerization

Emulsion polymn. of styrene in the presence of CaCO3 modified with titanate AT52 was carried out; particles were covered with a polymer layer consisting of small particles. The amt. of encapsulating polymer in the isolated product was detd. 80% Of the polymer in the product was extd. with toluene and its mol. wt. was det