Interface-by-design in zirconia-polyurea matrix hybrid composites

[摘要] This study investigates the incorporation of zirconia particles in polyurea matrix to form hybrid composites. Pristine zirconia particles in the monoclinic phase are first premixed with an oligomeric diamine-a reactant for polyurea-as an alternative method of surface functionalization that does not require the use of organosilanes. Interfacial interactions between the zirconia particles and polyurea are revealed via attenuated total reflectance-Fourier transform infrared spectroscopy, where a shift and broadening of the urea-carbonyl stretching and an increase in relative intensity of the corresponding disordered vs. ordered N-H stretching are shown in hybrid composites vs. bulk polyurea. The composition dependence of the viscoelastic relaxation characteristics and dynamic storage modulus in hybrid composites as determined by dynamic mechanical analysis are also elaborated upon. Additionally, we evaluate the potential of exploiting zirconia-polyurea hybrids to enabling dynamic impedance optimization at the interface of a select bi-layer construct, particularly when considering the material response under dynamic loading environments.

[发布日期] 2020-11-17

[关键词] Zirconia;Polyurea elastomer;Hybrid composites;Intermolecular hydrogen-bond interaction;Attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy;Microstructure;Wide angle X-ray diffraction (WAXD);Small angle X-ray scattering (SAXS);Dynamic mechanical relaxation