RESUMEN En este trabajo se polimerizo estireno en un reactor de microondas. La irradiacion por microondas permitio preparar rapidamente poliestireno por la tecnica de polimerizacion en emulsion. La polimerizacion mejora en presencia de oxido de Titanio. Abstract Styrene was polymerized in a Microwave Reactor. Polystyrene was quickly prepared in the microwave reactor by emulsion polymerization. Polymerization was enhanced in presence of Ti0 2