Synthesis of self-healing soybean oil-based waterborne polyurethane based on Diels-Alder reaction

In order to endow water-based polyurethane with special functionality, vegetable oil-based waterborne polyurethane with self-healing properties is synthesized. Firstly, soybean oil-based emulsifier (GA-ESO) was prepared by epoxy soybean oil and glutaric acid without solvent and catalyst. Then, two Diels-Alder (DA) diols were prepared by the DA reaction between N,N '-(4,4 '-methyldiphenyl) bismaleimide, 4-maleimide phenol and furfuryl alcohol, respectively. Finally, GA-ESO and DA diols used as the raw material was reacted with isophorone diisocyanate to synthesize a series of soybean oil-based waterborne polyurethane with self-healing behavior. The effects of DA diol on the properties of polyurethane films and the self-healing process and mechanism of polyurethane membrane were investigated. The results showed that after the addition of DA diol, the particle size of polyurethane emulsion increased from 28.8 to 85.3 nm, the tensile strength was improved from 0.3 to 12.6 MPa, and the water contact angle was enhanced from 68.5 degrees to 84.2 degrees. In addition, it can be observed that with the addition of DAdiol, the polyurethane film had self-healing behavior at high temperature, and the highest self-healing efficiency can reach 100%.

Automated summary

In this study, vegetable oil-based waterborne polyurethane with self-healing properties was synthesized by incorporating Diels-Alder diol. The addition of the Diels-Alder diol improved the properties of the polyurethane film, including increased particle size, enhanced tensile strength, and improved water contact angle. Additionally, the polyurethane film exhibited self-healing behavior at high temperatures, with a maximum self-healing efficiency of 100%.