Limonene-derived polycarbonates as biobased UV-curable (powder) coating resins

The evaluation of poly(limonene carbonate)s (PLCs), derived from orange oils and carbon dioxide, as UV-curable (powder) coating binders is described. PLCs with moderate molecular weight were prepared by copolymerization limonene oxide CO2 a subsequent reduction step transcarbonation 1,10-decanediol (1,10-DCD). These cured trifunctional thiol monomer in the presence photoinitiator via thiol-ene chemistry to form poly(thioether-co-carbonate) networks. UV curing resins following solvent casting was studied at 130 °C using ATR-FTIR, revealing fast quick network (TEN) formation, realized addition reactions groups agent onto pendant isopropenyl PLC. An ene enhanced crosslinking also observed, known ‘cage effect’, which discovered for first time system. efficient TEN formation evidenced high sol fractions those UV-cured samples their dynamic mechanical thermal analysis (DMTA). DMTA results these TENs showed Tgs (up 125.9 °C) wide range thermomechanical properties, including rubbery moduli 4.4–27.5 MPa. powder employing outstanding properties such transparency, good acetone resistance, pencil hardness (H-2 H) König (174?199 s), suggesting potential very promising biobased alternatives conventional resins.