Abstract:

Acrylpimaric acid diglycidyl ether(AE) was synthesized from acrylpimaric acid(APA), a rosin derivative, and acrylpimaric acid cyclocarbonate(AC) was further prepared. Then the rosin-based non-isocyanate polyurethane(ACPP) film materials was prepared by the reaction of the cyclic carbonate groups of AC with the amino group in polyethylenimine(PEI) and the polyester polyamine(Priamine 1074). The structure and properties of ACPP materials were characterized by Fourier transform infrared spectroscopy(FT-IR), thermogravimetric(TG), dynamic thermomechanical analysis(DMA) and other techniques. The results showed that with the increase of AC content, the introduction of rigid structure of hydrogenated phenanthrene ring in the rosin structure increased, resulting in the enhancement of the mechanical properties of ACPP. The tensile strength of the material (ACPP₁) could reach 15 MPa when the amino/cyclocarbonate group molar ratio value was 1. At the same time, the glass transition temperature(T_g) of ACPP material increased significantly, which were greater than 40 ℃. When the molar ratio of amino group to cyclocarbonate group was 0.8, the T_g of ACPP_0.8 reached the maximum value of 49.4 ℃. The results of self-healing performance test showed that the scratch healing of ACPP₁ material with scratch could be achieved after 1 h heating at the condition of 160 ℃ and 5 MPa, and the healing rate was up to 100%. In addition, after physical reprocessing and chemical recovery and reprocessing, the mechanical properties of ACPP₁ materials could still be restored to 85% of the original strength, showing excellent recovery and reprocessing performance.

Key words: acrylimaric acid, non-isocyanate polyurethane(NIPU), self-healing, reprocessing