荧光疏水自修复聚氨酯-丙烯酸酯杂化乳液的制备及其性能OA

A crosslinked fluorescent polyurethane(BA-FPUA-0)with terminal double bonds was synthesized using isophorone diisocyanate(IPDI)and poly(butylene adipate)(CMA-1044)as raw materials,with 4-N-perfluorobutylsulfonylethylenediamine-N-(2-hydroxy-1-hydroxymethylethyl)-1,8-naphthalimide(BA-F)made in our lab as a chain extender,trime-thylolpropane(TMP)as a crosslinking agent,and hydroxyethyl acrylate(HEA)as an end-capping agent.Subsequently,a series of fluorescent,hydrophobic,and self-healing polyure-thane-acrylate hybrid emulsions(BA-FPUA)were prepared via a semi-continuous seeded e-mulsion polymerization method,in which n-butyl acrylate(n-BA)and dodecafluoroheptyl methacrylate(DFMA)were used to modify the fluorescent waterborne polyurethane.The effects of the acrylate hybridization ratio on the structure and properties of BA-FPUA emul-sions and films were systematically investigated using Fourier-transform infrared spectrosco-py(FTIR),nuclear magnetic resonance(1H-NMR),ultraviolet-visible spectroscopy(UV-Vis),fluorescence spectroscopy,dynamic light scattering(DLS),thermogravimetric analysis(TGA),differential scanning calorimetry(DSC),X-ray diffraction(XRD),contact angle measurement,X-ray photoelectron spectroscopy(XPS),tensile testing,scanning electronic microscopy(SEM)and optical microscopy.The results confirmed the expected chemical structure.With increasing hybridization ratio,the particle size of the BA-FPUA emulsions in-creased,while the thermal stability,hydrophobicity,and tensile strength of the films were en-hanced.The elongation at break first increased and then decreased,whereas the fluorescence intensity and crystallinity decreased.At a hybridization ratio of 4∶10,the BA-FPUA-4 film maintained good fluorescence performance,exhibited a high water contact angle of 121.5 °,a low water absorption rate of 4.03％,a tensile strength of 35.2 MPa,and an elongation at break of 510％.Moreover,the BA-FPUA films demonstrated self-healing capability,with scratches on the BA-FPUA-4 surface almost completely disappearing after 12 hours.