Sparx Engineering acquired the Mix-Molder(TM) system to evaluate polymer blends and determine optimum pigment loadings. Having previously worked with expensive capital equipment such as the Process 11, we were particularly interested in the effectiveness of the mixing system for blending additives. Experience driven effects observed from shear upon additives in reactive extrusion, presented a true evaluation of the Mix-Molder(TM) system to answer the fundamental question: For modification of engineering grade resins with additives, would the Mix-Molder(TM) provide sufficient mixing and shear to prepare representative samples for optimization of new products?
Several experiments presented the system with specific challenges. First, an alloy polymer blend of polycarbonate and polyester was impregnated with black pigment. Application of the Mix-Molder(TM) system generated samples that were indistinguishable from native resin, as measured by TGA (thermogravimetric analysis) and DSC (differential scanning calorimetry). Continue reading