ALIPHATIC ETHYLENE GLYCOL MONOMERS AS A BASIS FOR PHOTOPOLYMERIZABLE SUSPENSIONS

A comprehensive study of the influence of the nature of aliphatic monomers of ethylene glycol diacrylates on the properties of photo-cured suspensions based on a complex oxide powder with a garnet structure of the (Gd,Y)3Al2Ga3O12:Ce composition for three-dimensional printing by Digital Light Processing (DLP) has been carried out. The rheological characteristics of suspensions, as well as the polymerization depth, were studied using both the model HDDA monomer and the specified diacrylates, when filled with solid particles of 30 vol.% (70 wt.%). The viscosity of the photo-cured suspensions systematically increases from 0.627 to 2.38 Pa∙s, depending on the molecular weight of the initial monomer. In addition, with an increase in the chain length in the range of ethylene glycol diacrylates, an increase in the depth of polymerization is observed compared with the model monomer. 3D printing of composites was carried out, followed by debinding and high-temperature sintering, which made it possible to obtain thin-walled ceramics of a mesh structure with a hole diameter of ~ 400 µm. It is established that the choice of monomer plays a key role in achieving high print resolution and improving the quality of ceramics. The most optimal characteristics of both suspensions and final ceramics have been demonstrated for compositions based on triethylene glycol diacrylate. Based on the results of differential thermogravimetric analysis, a comparison of the processes of removing organic binder in the air and inert atmosphere was carried out. It is shown that even with a fairly short (12 h) regime, the use of an inert medium makes it possible to almost completely eliminate the presence of internal cracks and delaminations while maintaining a certain number of pores in ceramic samples due to the inhibition of the oxidation processes of organic components. For citation: Ermakova L.V., Sergeev A.M., Smyslova V.G., Lelekova D.E., Shatalova T.B., Sokolov P.S. Aliphatic ethylene glycol monomers as a basis for photopolymerizable suspensions. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2025. V. 68. N 2. P. 88-95. DOI: 10.6060/ivkkt.20256802.7131.