Cellulose nanocrystal with high dielectric constant as well as preparation method and application thereof

The invention provides a cellulose nanocrystal with a high dielectric constant as well as a preparation method and application of the cellulose nanocrystal. According to the preparation method, a group of a C6 side chain of the cellulose nanocrystal is subjected to micromolecule group modification, so that the dielectric property of the cellulose nanocrystal is controlled, the dielectric constant of the CNCs can be increased to 10 or above, in addition, the dielectric loss is small, the dielectric response to temperature is also improved, and the material dispersity, the film forming property and the thermal stability are good; the method has strong adaptability to the current functional film production line, and can be applied to the fields of capacitors, organic field effect transistors, organic light-emitting diodes, sensors, organic photovoltaic devices and the like. 本发明提供了一种高介电常数的纤维素纳米晶、其制备方法及应用。所述的制备方法通过对所述纤维素纳米晶的C6侧链的基团进行小分子基团修饰，来控制纤维素纳米晶的介电性能，可将CNCs的介电常数提高到10以上，另外介电损耗小，而且对温度的介电响应也有所改善，且材料分散性、成模性，热稳定性良