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|Title:||Poly(methyl methacrylate) with high syndiotatic content obtained by microemulsion polymerization using different surfactants [Poli(metacrilato de metilo) con alto contenido sindiotactico obtenido via polimerizacion en microemulsion utilizando diferentes tensoactivos]|
Mendizábal, E. M.
|Abstract:||In this paper, we present the microemulsion polymerization of MMA in three components using di erent 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. 1H and 13C NMR spectra of poly(methyl methacrylate) indicate that polymer with an average syndiotactic conguration 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 conned 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 microemulsion 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 conguration.|
|Appears in Collections:||Producción científica UdeG|
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