Abstract: Acrylic-modified rosin was synthesized by Diels-Alder reaction using resin acid and acrylic acid as raw materials.The gas chromatography(GC) was employed in analyzing the content of acrylpimaric acid which was the main constituent of acrylic-modified rosin.And the optimum reaction conditions were resin acid 10g, reaction temperature 230℃, microwave energy 400W, reaction time 90min, and n(acrylpimaric acid):n (resin acid) 2:1.Under the optimum conditions, the GC content of acrylpimaric acid was 78.4%, and the conversion rate of abietic-type acid was up to 98.6%. γ-Acrylpimaric acid was isolated by controling pH value and silica gel column, and the GC content of the purified product was 95.7%.The structure of the γ-acrylpimaric acid was characterized by GC, GC-MS, FT-IR, ¹H NMR, and ¹³C NMR.The glass transition temperature and the thermal decomposition temperature of γ-acrylpimaric acid were 79.78℃ and 335.9℃ by DSC and TG analysis, respectively.

Key words: acrylpimaric acid, microwave irradiation, Diels-Alder reaction, GC content