Abstract:

Using rosin as raw material, acrylipimaric acid(APA) was synthesized through Diels-Alder reaction and purified, and then the esterification reaction between APA and epoxidized soybean oil(ESO) were performed to prepare a range of APA and ESO copolymer composite materials(APA-ESO) with different molar ratios of carboxyl and epoxy group. The properties of composite materials were characterized by Fourier transform infrared spectroscopy(FT-IR), thermal gravimetric analysis(TGA), dynamic mechanical analysis, mechanical performance analysis and other methods. Because of the rigid structure of APA, the glass transition temperature(T_g) of the composite material was much higher than room temperature. The T_g of APA-ESO1.25 with the molar ratio of carboxyl and epoxy group 1.25 was the highest(85.4℃) and it showed excellent mechanical properties. The tensile strength of APA-ESO1.00 with the molar ratio of 1.00 reached 18.82 MPa. At the same time, the composite materials exhibited excellent self-repair behavior and reprocessing performance. At 180℃, the self-repair efficiency of APA-ESO0.75 with the molar ratio of 0.75 could reach 90.3% at 5 min, and the self-repair efficiency could reach 92.9% at 30 min. Moreover, the composite material APA-ESO1.00 could be reprocessed by hot pressing, and the mechanical properties after reprocessing could reach 89% of the original sample. In addition, APA-ESO1.00 also had a shape memory effect.

Key words: acrylpimaric acid, epoxidized soybean oil, self-healing, reprocessing