| abstract |
A Janus oligomer with full-spectrum selective reflection and photoluminescence, and a preparation method thereof. The Janus oligomer with full-spectrum selective reflection and photoluminescence is constructed by graft copolymerization of a chiral liquid crystal monomer, a nematic liquid crystal monomer, a fluorescent molecule and polymethylhydrosiloxane, and the structure of the Janus oligomer with full-spectrum selective reflection and photoluminescence is shown in formula I. The Janus oligomer can achieve full-spectrum selective reflection reversibly and accurately during the heating and cooling processes. When excited by ultraviolet light, the Janus oligomer can emit fluorescence. When the temperature rises from room temperature to the thermal decomposition temperature of the Janus oligomer, the fluorescence intensity decreases monotonously, and the change of the fluorescence intensity with temperature is still highly reversible. The Janus oligomer prepared by the present invention has double peculiarities of dynamically reversible full-spectrum selective reflection and photoluminescence, and has wide application prospects in the field of anti-counterfeiting. The preparation route of the Janus oligomer is short, the operation is safe and simple, and the reaction condition is mild. |