The ultraviolet light curable hyperbranched aliphatic polyamidester (HAPAE-2-A) was synthesized based upon 4-N, N-di(2-hydroxyethyl)-4- ketobutyric acid as a AB_2 monomer, and 2-ethyl-2-(hydroxymethyl)-1,3- propanediol as a core molecule, then modified with acryloyl chloride. The molar mass and polydispersity of the polymer were measured by VPO and GPC as 1620 g/mol and 2.16, respectively. The reaction degree was obtained to be over 85% by ~1H NMR. That is HAPAE-2-A obtained possesses, practically, an average of over 10.2 of the end double bonds in each molecule. The photopolymerization kinetics has been determined by Photo-DSC measurements. The results show that the addition of multi-functional comonomer with low viscosity can efficiently increase the maximum polymerization rate and the unsaturation conversion in the cured films, as well as raising glass transition temperature.

Key words: POLYAMINO ESTER, BRANCHED POLYMER, PHOTO POLYMERIZATION, REACTION KINETICS