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Resumen: En el presente proyecto se estudio el proceso de reciclaje de poliestireno expandido (EPS) por el metodo de disolucion – precipitacion, como alternativa para minimizar el impacto ambiental posconsumo. Se desarrollo el reciclaje de empaques de EPS de electrodomesticos variando las condiciones del metodo con el fin de recuperar poliestireno. Los residuos de EPS recolectados y fragmentados, se disolvieron en tetrahidrofurano (THF) y se precipitaron  con etilenglicol (EG), bajo agitacion mecanica continua. El polimero precipitado se separo por filtracion y posterior secado, molienda y lavado. El producto asi tratado se lo caracterizo estructuralmente por espectroscopia infrarroja, termicamente por calorimetria diferencial de barrido y termogravimetria. Ademas, se determino el indice de fluidez para estimar su capacidad de procesamiento. De los ensayos realizados se obtuvieron polimeros estructuralmente semejantes al poliestireno, con un grado de contaminacion menor al 1.6 % de agente precipitante, presentan un indice de fluidez entre 15.56 y 23.60 g/10 min por lo que pueden ser reprocesados por inyeccion y extrusion, la temperatura de transicion vitrea y el peso molecular son similares a los residuos de EPS. El ensayo con mejores resultados fue la disolucion 30 % EPS y precipitacion con una relacion volumetrica 1/3 THF/EG, ofreciendo un polimero sin contaminacion por el etilenglicol remanente. Abstract: In this project the recycling process of expanded polystyrene (EPS) was studied by the method of dissolution - precipitation, as an alternative to minimize the environmental impact post-consumer. Thus, recycling of EPS packaging was developed varying the conditions of the method in order to recover polystyrene reprocessing. The EPS waste collected and fragmented were dissolved in tetrahydrofuran (THF) and precipitated with ethylene glycol (EG) under continuous mechanical stirring. The precipitate polymer was recovered with filtration, through drying, crushing and washing. The recovered polymers are structural characterized by the infrared spectroscopy, thermal by differential scanning calorimetry and thermogravimetry. Melt flow index was measured in order to estimate its processability. The tests performed indicate that the polymers obtained are structural identical to polystyrene with a lower degree of contamination to 1.6 % of precipitant, they have a melt index between 15.56 and 23.60 g/10 min so can be reprocessed by injection and extrusion, the glass transition temperature and molecular weight are similar to the waste EPS. The best performing test was 30 % EPS solution and precipitation with a volume ratio 1/3 THF/EG, offer a polymer free ethylene contamination.

Reciclaje de Poliestireno Expandido por el Método de Disolución Precipitación