Preparation and properties of bio-based waterborne polyurethane modified emulsified asphalt
To promote the research and application of renewable resources and low-carbon asphalt materi-als,bio-based waterborne polyurethane(BWPU)and its modified emulsified asphalt were prepared by partially replacing petroleum-based polyols with vanillin.The properties of BWPU and its modified emulsi-fied asphalt were evaluated using nuclear magnetic resonance spectroscopy,Fourier-transform infrared spectroscopy,dispersion and stability tests,mechanical tensile tests,and dynamic shear rheological tests(DSR).The results showed that the synthesized waterborne polyurethane exhibited the expected structure with vanillin end-capping and a tensile strength of 12.85 MPa and elongation of 2 055％.Both BWPU and its modified emulsified asphalt showed good storage stability before and after mixing with the base as-phalt emulsion.Furthermore,the addition of BWPU resulted in modified emulsified asphalt with higher complex modulus and smaller phase angle of the residual after evaporation compared to the base emulsi-fied asphalt,imparting excellent elastic properties to the residual of the emulsified asphalt.
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