Tung oil-based UV-curable active monomers and bio-based copolymers

In a new work, researchers successfully synthesised two kinds of tung-oil-derived renewable UV-curable active monomers, tung-acid-maleic tri-acrylate (TOAH) and tung-maleic tetra-acrylate (TMPG).

Wooden acoustic guitar.
Tung oil is used for the care of wood -

1H NMR and FT-IR results collectively revealed that the targeted active-monomers were successfully prepared. UV-curing kinetics of the films was studied by Photo-DSC, thermal properties of their cured films were investigated by dynamic mechanical analysis, thermogravimetric analysis and general performance of UV-curing films including acidic, alkaline resistance and boiling-water resistance were also investigated. Tensile properties of the cured films were also tested. Dynamic mechanical analysis demonstrated that the storage modulus and glass transition temperatures of the cured films increased while increasing the content of TMPG monomer.

Balanced properties through mixing of the bio-based monomers

The crosslinking density of the cured copolymers also increased with the increasing content of TMPG monomer. TGA showed that the maximum thermal decomposition temperatures (Tmax) of the cured copolymers were all above 420 °C. Tensile tests indicated that the tensile properties were better in the cured systems when the mixed films consisted of 50TOAH/50TMPG and 30% HDDA reactive diluent. Finally, all the results demonstrated that comparable balanced properties could be obtained by mixing these two bio-based monomers together.

The study is published in: Progress in Organic Coatings Volume 129, April 2019, Pages 116-124.

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