2 methyl 4 methylthio 2 morpholinopropiophenone

Example 1

In this example, 500 grams of photopolymer formulation were prepared by mixing trimethylol propane triacrylate (TMPTA, Miramer M300, Miwon) 35% wt, 1,6-haxanediol diacrylate (HDDA, Miramer M200, Miwon) 25% wt and 3,3-dimethyloxetane (Sigma-Aldrich) 30% wt in a black flask. This mixture was stirred form 10 minutes to obtain a homogenous solution, then, 2-methyl-4′-(methylthio)-2-morpholinopropiophenone (Sigma Aldrich) 2% wt, zinc tetraphenyl porphyrin (Sigma Aldrich) 3% wt and diphenyl iodonium hexafluorophosphate (Sigma Aldrich), 5% wt were added slowly and the reaction mixture was sonicated at 50° C. until all solids dissolved.

The 3D object was created using the setup described above and shown in FIG. 6, allowing for the selective use of UV light and visible light below 460 nm. These wavelengths were used in order to selectively induce the radical photopolymerisation. The bottom part of the 3D object was built using radical photopolymerisation. After completion of the bottom part of the 3D object, the red subpixels were used in order to selectively induce the cationic photopolymerisation. The top part of the 3D object was built using a cationic photopolymerisation process. After completion of the 3D printing process, the finished object was removed from the platform and post exposed under UV light and red light for 60 minutes, respectively.