Microemulsion Polymerization. 3. Molecular Weight and Particle Size Distributions

Autor:	Stefan Burauer, Carlos C. Co, Patricia Metzger Cotts, Eric W. Kaler, Renko De Vries
Rok vydání:	2001
Předmět:	Kinetic chain length Polymers and Plastics Organic Chemistry Radical polymerization Emulsion polymerization Chain transfer Inorganic Chemistry chemistry.chemical_compound Monomer chemistry Polymerization Chemical engineering Catalytic chain transfer Polymer chemistry Materials Chemistry Polystyrene
Zdroj:	Macromolecules. 34:3245-3254
ISSN:	1520-5835 0024-9297
DOI:	10.1021/ma001248b
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e4812df8df8751f3024ca8a126801a92 https://doi.org/10.1021/ma001248b Zobrazit plný text záznamu