Determination of Gel Content of Acrylic Latexes by Size Exclusion Chromatography

Seeded Semibatch Emulsion Copolymerization of n-Butyl Acrylate and Methyl Methacrylate

“…For reaction 50/50, the experimental values of the sol M w were higher than the predicted ones. It might be possible (the open literature has few reports on sol molecular weight and gel content measurements in gel-forming copolymerization systems 7,8,10 ) that this discrepancy is due to the limitations of the size-exclusion chromatographic technique when dealing with high-M w , long, nonlinear, branched polymer solutions.…”

“…Sayer et al , measured the gel fraction as the relative difference between the concentration of the polymer injected into the gel permeation chromatography (GPC) column and the polymer concentration detected in the GPC analysis. However, comparison of this method with those based on extraction processes showed that the GPC method was less reproducible and tended to overestimate the amount of gel …”

“…However, comparison of this method with those based on extraction processes 9 showed that the GPC method was less reproducible and tended to overestimate the amount of gel. 10 In the present work, the effects of the comonomer ratio on the kinetics of the high-solids-content, seeded semicontinuous emulsion copolymerization of n-BA/ MMA and on the properties of the polymer produced were investigated. Such a study has not previously been reported in the open literature.…”