Preparation and UV-curing properties of rosin-based allyl phthalate oligomer

The acid-base stability of UV cured materials is an important issue in the field of material applications. Bio-based rosin modified diallyl phthalate oligomers (RS-DAP) with higher hydrophobicity were synthesized by the radical reaction of rosin with diallyl phthalate. The structures of RS-DAP were confirmed by FT-IR, H-1 NMR and electrospray ionization high resolution mass spectrometry (ESI-HRMS). The UV-curing properties of acrylate components containing RS-DAP were investigated by FT-ATR. And the effects of RS-DAP dosage on the double bond conversion of neopentyl glycol diacrylate (NPGDA) and the properties of cured film were evaluated. The results show that the introduction of aromatic rings of DAP and the rigid structure of rosin moiety can improve the UV curing rate, gelation ratio, hardness, and chemical resistance of cured film. The composition of RS-DAP resin with acrylate monomer and RJ313 resin can be 3D printed into specimen with smooth surface, good precision, good thermal stability, hardness of 6 H, and 93% of gel content.