Improving Chain Transfer Agent Mass Transfer in the Semicontinuous Emulsion Copolymerization of Vinyl Acetate/Butyl Acrylate

Zubitur, Manuela; Asúa, José M.

doi:10.1002/1439-2054(20010601)286:6<362::aid-mame362>3.0.co;2-h

Cited by 4 publications

(2 citation statements)

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“…One further and important adjustment was necessary in order to accurately predict the molecular weights formed in the experiments using n ‐DM. It is well known that the mass transfer of n ‐DM across the emulsified droplet interface and/or through the water phase is often a limiting step in emulsion polymerization 16–25. This results in n ‐DM being less effective for altering the molecular weight than it would be in a bulk or solution polymerization.…”

Section: Resultsmentioning

confidence: 99%

“…To the best of our knowledge, no study has ever been conducted to specifically investigate this issue. However, many researchers have investigated the use of CTAs (particularly the mercaptans) in emulsion polymerization in general 16–26. An important feature of emulsion polymerization systems utilizing mercaptan CTAs is that under some conditions the effectiveness of the CTA may be limited by its mass transfer from the monomer droplet, through the water phase, and into the polymer particle where it is needed to control the molecular weight distribution (MWD).…”

Section: Introductionmentioning

confidence: 99%

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Nonequilibrium morphology development in seeded emulsion polymerization. IV. Influence of chain transfer agent

Stubb

Sundberg

2006

J of Applied Polymer Sci

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ABSTRACT:We performed a series of experiments to study the effect of a chain transfer agent, n-dodecyl mercaptan (n-DM), on the development of morphology in composite latex particles. The morphologies were determined using a combination of transmission electron microscopy, differential scanning calorimetry, and surfactant titration. The polymer molecular weights were reduced up to 10-fold with n-DM levels up to 1.4% in the monomer. The addition of n-DM can increase the extent to which second-stage polymer domains are formed within the interior regions of the seed particles, but this is only expected under specific conditions. Numerical simulations support this conclusion. We also observed that the reduction in the molecular weight of the second-stage polymer did not significantly increase the extent of phase separation and morphology rearrangement within the particles. The overall effect on the morphology was limited.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%