UV curing behaviors and performance of acrylate terminated hyperbranched polyester/polyurethane acrylate

The UV curing reaction of acrylate terminated hyperbranched polyester(VHBP)/polyurethane acrylate curing systems was researched by Fourier transform infrared spectroscopic (FT-IR). The affection of content and generation of VHBP on performance of coatings was investigated. The results show that the time of reaching the final double bond conversion of pure polyurethane acrylate(PUA) system is less than others, that of the high content and generation of VHBP systems are more. The hardness of the coatings is increased greatly after adding VHBP to PUA systems. The performance of VHBP systems is better than the traditional PUA/epoxy acrylate(EA) system. With the increase of the content of VHBP, the hardness of coatings increase and the impact resistance and adhesion decrease. When the content of VHBP is the same, the hardness is decreased with the generation of VHBP increasing.