High compatible free radical UV-curable fluorine-containing polyacrylic acrylate prepolymer.

Fluorine-containing polyacrylic acrylate prepolymers, with different molecular weight and fluorine content, were successfully synthesized by solution radical polymerization of acrylate monomer and following esterification. The compatibility of the prepolymers with solvents and acrylate monomers could be improved markedly with introduction of butyl acrylate as co-monomer and decreasing the polymer molecular weight. It could form homogeneous solution in solvents and monomers and transparent cured film combined with commercial photoinitiator and monomer, evidenced with vision, transmittance, dynamic mechanic and graphic analysis. At the same time, this kind of prepolymers could perform rapid photopolymerization and reach about 95% double bond conversion after 90 s ultraviolet irradiation. It also showed unique surface tension as low as 24.9 dyn/cm and lower glass transition temperature ( T g ) with higher fluorine concentration. This kind of novel prepolymer could be widely used in photopolymerization for low surface tension and high optical demands. [ABSTRACT FROM AUTHOR]