Angle-independent Structural Color Based On Polystyrene Microspheres

Angle-independent structural color based on PS amorphous array was detailedly researched in this dissertation. Visible light can be coherently scattered in the amorphous array which has only a short-range order but no long-range periodicity, and structural color without angle-dependency can be obtained.Chaotic convective flow assembly method which was used for fabricating angle-independent structural color was originatively developed. Chaotic convective flow will appear when a piece of ventilating film covered over the emulsion surface during self-assembly process, and will lead to PS spheres disorderly packed. Hydrophobic copy paper of17g/m2and printing paper of80g/m2were investigated, respectively. The prepared materials were characterized by SEM and reflection spectrum, and the results show that the materials are angle-independent under ambient light.Monodisperse PS-PMMA-PEA core-shell microsphere with regular morphology was prepared by emulsion polymerization. The size can be changed by adjusting the amount of emulsifier.Using PS-PMMA-PEA core-shell microsphere, angle-independent structural color films with flexibility and body strength were prepared by self-assembly at room temperature and by extrusion at170℃. SEM of the film shows that PS microspheres were amorphously packed and the space was filled by PEA. The films are angle-independent under ambient light.The color saturation of PS amorphous array was largely enhanced by introducing black dye into the system. Carbon black which is thermo-stability was used in the PS-PMMA-PEA system, enhanced the green and amaranthine color saturation. The absorption of incoherent light and background light increased the reflection contrast, resulted in distinct color.