Preparation of Photopolymerizable Organic-Inorganic Hybrid Materials by Nonhydrolytic Sol-Gel Processing for 3D Printing Applications

초록

Novel photopolymerizable formulations, able to photopolymerize with free radical photopolymerization, were developed and characterized as potential resins for digital light processing (DLP). Novel organic-inorganic hybrid materials were prepared based on cross-linkable fluoromethyl derivatives, trimethoxysilane precursor and bulky silanes by non-hydrolytic sol-gel processing and followed by thermal condensation and elimination of methanol as a byproduct. Through the sol-gel reaction, a high degree of dispersion of bulky silane compounds was achieved, which changed the optical properties of the final composite objects. Additionally, dicacrylate derivatives were used as crosslinker to support curing and modified silica aerogels were added to enhance mechanical properties of hybrid materials. Physical-mechanical, thermal properties, morphology of 3D objects were investigated by UTM, SEM, FTIR, TGA. We also measured viscosity of resins by plate type rheometer.