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Colloidal particle; emulsion polymerization; polystyrene; critical micelle concentration (CMC); surface charge density; charges per particle.

We have synthesized highly charged, crosslinked poly (styrene-𝑐𝑜-divinylbenzene-𝑐𝑜-sulfopropyl methacrylate) copolymer colloidal particles using emulsion polymerization. The effects of concentration of the emulsifier and the initiator on the particle size and the charge density of the colloidal particles are studied. Colloidal particle size is highly dependent upon the concentration of the emulsifier and the initiator. The colloidal particle diameter decreases with increasing concentration of the emulsifier and increases with increasing concentration of the initiator in the polymerization mixture. Number of particles, surface charge density and charges per particle are also functions of both the emulsifier and the initiator concentration. The surface charge density and the number of charges per sphere increase with increasing particle diameter. These copolymer colloid particles self assemble readily and diffract visible light. Polymer hydrogel imbibed with these colloids shows the light diffraction.

Dhamodaran Arunbabu¹ Mousumi Hazarika¹ Somsankar Naik¹ Tushar Jana¹

1. School of Chemistry, University of Hyderabad, Hyderabad 500 046, India

Published

December 2009

Manuscript received

21 August 2008

Manuscript revised

5 November 2009