Influence of carboxyl groups on the particle size and rheological properties of polyacrylate latices

Abstract

The PAL was synthesized with BA, MMA and some monomers containing carboxyl groups (for example, acrylic acid (AA) and methacrylic acid (MAA)) as co-monomers by semi-continuous seeded emulsion polymerization technique. The influences of alkalinization temperature, the feeding manner of AA or MAA on the particles size Rheological properties and carboxyl distribution of the latex were discussed, and the rheological mechanism was analyzed. The experimental results show that the PAL system has preferable viscosity and particle size when the alkalinization temperature is 50 °C. Different distribution of carboxyl group in the particles and different resultant rheological properties are obtained by different feeding manner of AA or MAA into the system. The TEM images show that the particle is a smooth globe with carboxyl group concentrating on the surface and stabilized with electric double layer and nonionic adsorbed layer. The concentration of carboxyl functional group on the surface of particles can be achieved by the specific polymerization technique. The rheologyical properties are determined by accretion of particle volume and variation of the two phase volume ratio resulted from the carboxyl group spreading layer.

Keywords

polyacrylate latices / acrylic acid / methacrylic acid / rheological properties

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