Molecular Characterization of Alkyd/Acrylic Latexes Prepared by Miniemulsion Polymerization

MINARI, ROQUE J; GOIKOETXEA, MONIKA; BERISTAIN, ITXASO; PAULIS, MARÍA; BARANDIARAN, MARÍA J.; ASUA, JOSÉ M.

JOURNAL OF APPLIED POLYMER SCIENCE

JOHN WILEY & SONS INC

Año: 2009 vol. 114 p. 3143 - 3151

0021-8995

The molecular architecture of alkyd/acrylic hybrid latexes produced by miniemulsion polymerization was characterized in terms of the resin degree of grafting, acrylic degree of grafting, reacted double bonds in the alkyd, gel content and molecular weight distribution of the sol part. A simple method based on conventional SEC measurements was developed to estimate the fraction of alkyd resin grafted to the acrylic polymer. The method can be applied to completely soluble hybrids as well as to hybrids containing gel. Also, the limits of the extraction method used in literature to estimate the fraction of acrylic polymer grafted to the alkyd was investigated, finding that this technique only provides accurate results at high values of acrylic degree of grafting. Combination of this information with the reacted double bonds of the alkyd (determined by iodine titration) and the MWD of the sol polymer, provides a detailed characterization of the alkyd-acrylic hybrid polymer.