Mixtures of methacrylic polymers are the most common materials for making composites\nto be used as resins for dental and cosmetic applications. Some of these mixtures are composed\nby poly(ethyl methacrylate) (PEMA) and poly(methyl methacrylate) (PMMA), which constitute\na solid component to be mixed with a liquid component made out of methacrylate monomers.\nThe reaction between the thermal initiator benzoyl peroxyde (BPO) present in the solid component\nand the activator of the polymerization process, N,N-dimethyl-p-toluidine (DMT) present in the liquid\ncomponent, gives rise to thermoset materials. In the present study, different liquid formulations\ncomposed by a mixture of two methacrylic monomers, ethyl methacrylate (EMA) and triethylene\nglycol dimethacrylate (TEGDMA) for cosmetic applications, were prepared and characterized, using a\ncommercial powder (POW) composed by PEMA and PMMA. With the aim of improving workability\nduring final application of the material, it was necessary to slow down the polymerization rate of\nliquid formulations. Their thermal behavior was investigated by differential scanning calorimetric\n(DSC) in order to check the polymerization rate. Thermal stability of final materials was determined by\nthermogravimetric analysis (TGA). Dynamic mechanical thermal analysis (DMTA), microindentation\nhardness and impact tests were performed on final materials, to assess their performance with respect\nto standard formulation. The combination of thermal and mechanical properties allows choosing\nwhich formulations could be suitable for use in cosmetics.
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