Photopolymerization of hyperbranched aliphatic acrylated poly(amide ester). I. Synthesis and properties

The hyperbranched aliphatic poly(amide ester) (HAPAE) was synthesized based on 4-N,N-di(2-hydroxy ethyl)-4-ketobutyric acid prepared by the reaction of succinic anhydride with diethanol amine, as an AB, monomer (repeating unit), and with 2-ethyl-2-(hydroxymethyl)-1,3-propanediol, as a core molecule, using acid catalysis. The second generation of the product was characterized by measuring dynamic Viscosity, which decreased sharply with the increase in frequency. The product exhibits relative thermal stability as analyzed by thermogravimetry in a nitrogen atmosphere. The glass transition temperature, determined by differential scanning calorimetry, is -27 degreesC. The molar mass was measured by vapor pressure osmometry. The polydispersity, measured by size exclusion chromatography, is 2.16. Dynamic mechanical thermal analyses were performed to characterize the thermal properties of the ultraviolet-cured films of the acrylate-modified HAPAE. (C) 2001 John Wiley & Sons, Inc.