Evaluierung von Thiol-Alkin-Methacrylat-Systemen für die Additive Fertigung von keramischen Komposit-Strukturen

Progress in the development of the stereolithographic process enables the additive manufacturing of complex three-dimensional ceramic composite structures. This technology is based on photopolymers, which are filled with ceramic particles in contrast to classical stereolithography. The composition of the photopolymer has a significant influence on both, the properties of the printed part and on the printing process itself. The purpose of this master thesis was the evaluation of a 3-component monomer system consisting of thiol, alkyne and methacrylate compounds for the additive manufacturing of ceramic composite structures. In this system, the chain-growth mechanism of the methacrylate monomers is combined with the thiol-yne step-growth mechanism of the thiol and alkyne monomers. The generated homogeneous network structure enables a higher monomer conversion as well as a higher thermal stability in comparison to pure methacrylate or acrylate systems. Furthermore, the shrinkage stresses during photopolymerization are comparatively low leading to a higher ductility of the generated networks. Based on the relatively low viscosity of the evaluated system, the 3D-printing of a composite part containing 65 wt.-% ceramic particles was possible.