Applications for Automotive Coatings

Grandhee, Sunitha

doi:10.1002/3527600582.ch7

Cited by 1 publication

(1 citation statement)

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“…Unlike typical dispersions produced via emulsion (aqueous) polymerization, the rate of reaction does not depend on the number of initial particles formed, but rather is dependent on the concentrations of monomer and initiator and their partition between the two phases 1, 2. Dispersion polymerizations of monomers such as methyl methacrylate (MMA), styrene (ST), and other acrylics are commonly carried out industrially in organic solvents, especially in alcohols and other water miscible solvents, with monomer soluble free radical initiators and water soluble surfactants 2, 3…”

Section: Introductionmentioning

confidence: 99%

A Study of Particle Nucleation in Dispersion Copolymerization of Methyl Methacrylate

Cockburn

McKenna

Hutchinson

2011

Macro Reaction Engineering

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The dispersion polymerization of methyl methacrylate (MMA) and its copolymerization with the bio‐renewable monomer γ‐methyl‐α‐methylene‐γ‐butyrolactone (MeMBL) is studied in a methanol/water mixture. The addition of MeMBL to an MMA dispersion decreases both rate and particle size (PS), while rate decreases and PS increases when the fraction of methanol in the continuous phase is increased. The differing effects of comonomer and continuous phase composition can be attributed to monomer partitioning and critical chain length (jcrit) of the radicals formed in solution. A cobalt(II) catalytic chain transfer agent (CCTA) was used to determine a value of 20–30 monomer units for jcrit in MMA dispersion polymerization. A distinct population of small particles, about one‐tenth as large as the 1–2 µm mature particles, was observed throughout the entire course of the dispersion polymerization; it is these particles, most likely aggregates of nuclei continuously generated in solution, that are swept up by the mature particles during growth.

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Section: Introductionmentioning

confidence: 99%