PDA/SiO2改性聚氨酯制备含结构色复合材料

采用改良St?ber法制得187、245、274 nm 3种粒径的SiO2微球，使用聚多巴胺（PDA）对SiO2微球进行包覆，制备了蓝色、绿色、红色3种不同颜色的非晶光子晶体PDA/SiO2（APCs）；将非晶光子晶体PDA/SiO2引入聚氨酯（PU）制得复合材料PDA/SiO2/PU 。利用FT-IR、CA、SEM、TEM、UV-Vis、DLS及万能试验机对PDA/SiO2及复合材料PDA/SiO2/PU的结构与性能进行表征分析。结果表明：APCs的颜色取决于SiO2微球的粒径；通过调节PDA的包覆量可调整APCs的色彩饱和度；APCs引入PU后可得到呈暗红结构色聚氨酯，其最大拉伸强度可达40.28 MPa，水接触角达113°，使得聚氨酯具有结构生色性和优异的机械性能与疏水性。

PDA/SiO2 modified polyurethane for the preparation of composites containing structural colors

Amorphous photonic crystals PDA/SiO2 (APCs) in three different colors, blue, green and red, were prepared by coating SiO2 microspheres with polydopamine (PDA) using a modified St?ber method with three particle sizes of 187, 245 and 274 nm; the amorphous photonic crystals PDA/SiO2 were introduced into polyurethane (PU) to produce the composite material PDA/SiO2/PU. The structure and properties of PDA/SiO2 and the composite PDA/SiO2/PU were characterised using FT-IR, CA, SEM, TEM, UV-Vis, DLS, and a universal testing machine. The results show that the color of the APCs depends on the particle size of the SiO2 microspheres; the color saturation of the APCs can be adjusted by adjusting the amount of PDA coating; the introduction of the APCs into the PU results in a dark red structured polyurethane with a maximum tensile strength of 40.28 MPa and a water contact angle of 113°, which gives the polyurethane structural chromogenic and excellent mechanical properties and hydrophobicity.