Process Routes Towards Novel Polybutylene Terephthalate – Polycarbonate Blend Powders for Selective Laser Sintering
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Additive manufacturing techniques, such as powder bed fusion (PBF) of polymers, often referred to as laser sintering (LS) or selective laser sintering (SLS), generate components directly from a CAD data set without using a specific mold. The range of materials commercially available for SLS merely includes some semi crystalline polymers, mainly polyamides. In this contribution two process chains to produce polybutylene terephthalate (PBT) – polycarbonate (PC) blend particles and the respective dependencies of product characteristics on process parameters are addressed. In the first recently proposed approach, blend powder systems are produced via co-comminution of PBT and PC in a planetary ball mill and subsequent thermal rounding of the obtained comminution product. This approach is compared to a route, where blend particles are obtained by agglomeration of comminution products of the respective polymers obtained by wet grinding and subsequent thermal rounding.