UV Polymerization of Methacrylates-Preparation and Properties of Novel Copolymers

More environmentally friendly polymeric materials for use in corrosive conditions were obtained in the process of UV polymerization of terpene methacrylate monomers: geranyl methacrylate and citronellyl methacrylate and the commercially available monomer methyl methacrylate. Selected properties (solvent resistance, chemical resistance, glass transition temperature, thermal stability, and decomposition course during heating) were evaluated. It was found that the properties of the materials directly depended on the monomer percentage and the conditioning temperatures used. An increase in the geranyl or citronellyl methacrylate monomer content in the copolymers reduced the solubility and chemical resistance of the materials post-cured at 50 degrees C. The samples post-cured at 120 degrees C were characterized by high resistance to polar and non-polar solvents and the chemical environment, regardless of the percentage composition. The glass transition temperatures for samples conditioned at 120 degrees C increased with increasing content of methyl methacrylate in the copolymers. The thermal stability of copolymers depended on the conditioning temperatures used. It was greater than 200 degrees C for most copolymers post-cured at 120 degrees C. The process of pyrolysis of copolymers led to the emission of geranyl methacrylate, citronellyl methacrylate, and methyl methacrylate monomers as the main pyrolysis volatiles.

Automated summary

UV polymerization process produced environmentally friendly polymeric materials for use in corrosive conditions. Material properties were found to be directly related to monomer percentage and conditioning temperatures. Increasing levels of geranyl or citronellyl methacrylate reduced solubility and chemical resistance in copolymers post-cured at 50 degrees C, while samples post-cured at 120 degrees C exhibited high resistance to solvents and chemical environment, regardless of composition.