Semi-crystalline dendritic poly(ether-amide)s were synthesized by modifying hydroxyl end-groups of dendritic poly (ether-amide) with aromatic urethane acrylate and octadetvl isocyanate. The ratio of these modifiers can adjust the final properties of products to fulfill the requirements of UV-curable powder coatings. These UV-curable semi-crystalline dendritic poly(ether-amide)s have a T-g in the range of 41-45degreesC and a T-m of around 120degreesC. Their thermal behavior and semi-crystalline properties were studied by DSC and XRD. The photopolymerization kinetics was investigated by Photo-DSC. The residual unsaturation, thermal stability, and hardness of the UV-cured films were also studied. The obtained results show that these semi-crystalline dentritic poly(ether-amide)s may be used as prepolymers in UV-curable powder coating systems. (C) 2003 Wiley Periodicals, Inc.