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Free Radical Emulsion Polymerization of Ethylene
journal contribution
posted on 2014-10-14, 00:00 authored by G. Billuart, E. Bourgeat-Lami, M. Lansalot, V. MonteilFree
radical polymerization of ethylene in aqueous media was performed
under mild conditions (T < 90 °C and Pethylene < 250 bar) using an anionic initiating (ammonium
persulfate, APS) and stabilizing (sodium dodecyl sulfate, SDS) system,
yielding polyethylene latexes. pH regulation was a key to the feasibility
of this process. Particle sizes and morphologies as well as polymerization
yields were affected by SDS concentration. In any case, yields increased
with polymerization time, especially in the presence of surfactant.
When increasing the polymerization pressure, the increase on yields
was much stronger in the presence of surfactant and particle sizes
increased more when no surfactant was used. Stable polyethylene latexes
with relatively high solids content (30%) were synthesized. This article
also reports a supercooling effect on the crystallization of the polyethylene
particles and evidences promising
water-repellency properties of paper coated with the PE latexes synthesized
in our laboratory.
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supercooling effectpresenceSDS concentrationpolymerization pressureparticle sizesParticle sizespolyethylene latexes250 barsodium dodecyl sulfatepolymerization timesurfactantpolymerization yieldspolyethylene particlesPE latexesFree Radical Emulsion Polymerizationammonium persulfateStable polyethylene latexesAPSpH regulation
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