%0 Journal Article
%T Poli (metacrilato de metilo) con alto contenido sindiot芍ctico obtenido v赤a polimerizaci車n en microemulsi車n utilizando diferentes tensoactivos
%A Flores
%A J.
%A Corona
%A M.A.
%A Moscoso
%A F.J.
%A Oseguera
%A O.
%A Manr赤quez
%A R.
%A L車pez-Dellamary
%A F.A.
%A Mendiz芍bal
%A E.
%J Revista mexicana de ingenier赤a qu赤mica
%D 2011
%I Universidad Aut車noma Metropolitana Unidad Iztapalapa
%X in this paper, we present the microemulsi車n polymerization of mma in three components using different surfactants (dtab, dtac, sds and aot). stable latices with particle sizes below 46 nm and polymer with high molecular weights (> 1 ℅106g/mol) were obtained. 1k and 13c nmr spectra of poly(methyl methacrylate) indicate that polymer with an average syndiotactic configuration between 72 and 78% was obtained; these values are larger than those reported for commercial pmma. these results are interpreted on the basis that due to the small size of the particles (18 to 45 nm), chain growth takes place in a confined space. as a result of the higher syndiotactic content, the glass transition temperature increased. on the grounds that tg is increased, the polymers obtained by microemulsi車n polymerization can be used at higher temperature than the commercial polymers. the structure and/or the electrostatic charge of the surfactant did not affect the extent of syndiotactic configuration.
%K methyl methacrylate
%K syndiotactic
%K microemulsion polymerization.
%U http://www.scielo.org.mx/scielo.php?script=sci_abstract&pid=S1665-27382011000100013&lng=en&nrm=iso&tlng=en