Nitroxide‐mediated radical polymerization in miniemulsion: Bimolecular termination in monomer‐free model systems | Zendy

Alam Md. Nur | Zendy; Zetterlund Per B. | Zendy; Okubo Masayoshi | Zendy

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Nitroxide‐mediated radical polymerization in miniemulsion: Bimolecular termination in monomer‐free model systems

Author(s) -

Alam Md. Nur,

Zetterlund Per B.,

Okubo Masayoshi

Publication year - 2007

Publication title -

journal of polymer science part a: polymer chemistry

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.768

H-Index - 152

eISSN - 1099-0518

pISSN - 0887-624X

DOI - 10.1002/pola.22294

Subject(s) - miniemulsion , nitroxide mediated radical polymerization , polymer chemistry , chemistry , polymerization , aqueous solution , radical polymerization , monomer , polystyrene , nitroxyl , polymer , organic chemistry

Bimolecular termination in nitroxide‐mediated radical polymerization in miniemulsion has been investigated through the heating of a polystyrene–2,2,6,6‐tetramethylpiperidinyl‐1‐oxy macroinitiator and its 4‐hydroxy‐2,2,6,6‐tetramethylpiperidinyl‐1‐oxy analogue in an aqueous toluene dispersion with sodium dodecyl benzenesulfonate as a surfactant at 125 °C. The level of bimolecular termination by combination, evaluated from the high‐molecular‐weight shoulder, was higher in miniemulsion than in solution and increased with decreasing particle size. Quantitative analysis revealed that these results cannot be rationalized solely by nitroxide partitioning to the aqueous phase. The results are explained by an interface effect, by which nitroxide is adsorbed or located at the aqueous–organic interface. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 4995–5004, 2007

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