Aprimoramento da metodologia de encapsulamento com poliestireno visando a escala industrial

Abstract

The microencapsulation technic consist in envelop a core with the material to protect by a solid shell that protects the core for the external environment.The solvent evaporation techtnic consist into two emulsion, the core that wants to be encapsulated, the polimers for the shell solved into a organic solvent and a dispesion media. For the process, the modification of process parameters are able to improve the yeld of the microencapsulation. It was produced polystyrene microcapsules with deionized water to evaluate the effect of core: shell ratio, evaporation temperature, the presence of sodium chloride and the surfactant in the efficiency microencapsulation process, when compared to a standard sample. Additionally, samples were characterized by scanning electron microscopy (SEM) and thermal gravimetric analysis (TG). It was found that the ideal core:shell ratio for the production of microcapsules is 2: 1, with 61.47% of yelding. Thermogravimetric analysis also indicated that the 2:1 ratio had better efficiency since it contained a larger amount of the core material. The SEM images showed that the formed microcapsule has smooth surface. The addition of surfactant and reducing the evaporation temperature increased the efficiency of 76.83% and 79.25% respectively.