Properties of Fe3O4@SiO2@IPDI-HEA Modified Waterborne Polysiloxane-Polyurethane UV-Cured Films

Fe3O4@SiO2@IPDI-HEA nanoparticles were prepared by solvothermal method using Fe3O4 nanoparticles as cores and acrylate as shells. The obtained nanoparticles were characterized by IR, TEM and XRD. The effect of the nanoparticles on the performances of waterborne polysiloxane-polyurethane photocuring system was studied by photo-DSC and TGA. The results showed that the addition of Fe3O4@SiO2@IPDI-HEA particles had no obvious influence the photopolymerization property of the system, but could significantly improve the heat resistance and tensile strength of the cured film. When the addition amount of Fe3O4@SiO2@IPDI-HEA was 1.5% (mass fraction), the initial decomposition temperature (T5%) of cured film increased by 21.9℃, the tensile strength enhanced by 6.9 MPa. Moreover, Fe3O4@SiO2@IPDI-HEA could impart certain electromagnetic properties to the UV-cured film. When the frequency was in the range of 0 to 1×107 Hz, the dielectric constants of cured films were above 4. © 2019, Editorial Office of FINE CHEMICALS. All right reserved.