Microemulsion polymerization. 3. Molecular weight and particle size distributions

Carlos C. Co, Patricia Cotts, Stefan Burauer, Renko De Vries, Eric W. Kaler

Research output: Contribution to journalArticlepeer-review

51 Scopus citations


Molecular weight and particle size distributions of latexes prepared by free radical polymerization of n-butyl methacrylate, tert-butyl methacrylate, n-hexyl methacrylate, and styrene in aqueous microemulsions of dodecyltrimethylammonium bromide surfactant are measured using GPC/ MALLS, QLS, and cryo-TEM. The results are compared to a molecular weight distribution model derived from the monomer partitioning and kinetic studies described in the accompanying papers. Polystyrene with weight-average molecular weights of ∼15 × 106 Da, which are 7 times greater than the limiting molecular weight imposed by chain transfer to monomer, are consistently obtained. Diffusion-limited exit of monomer radicals, generated by chain transfer, to the aqueous phase coupled with chain transfer to polymer are likely reasons for the enhanced polystyrene molecular weights.

Original languageEnglish (US)
Pages (from-to)3245-3254
Number of pages10
Issue number10
StatePublished - May 8 2001


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