Selenium-containing hyperbranched polymer (hbp), and preparation method and application thereof

A preparation method of a selenium-containing hyperbranched polymer (HBP), comprising following steps:

• S1, preparing a compound M1;
• S2, preparing an HBP;
• S3, dissolving the compound M1 obtained in the step S1 in anhydrous dichloromethane (DCM), adding anhydrous N,N-dimethylformamide (DMF) and oxalyl chloride, heating and stirring an obtained mixture overnight, and removing the anhydrous DCM, the anhydrous DMF, and excess oxalyl chloride under reduced pressure to obtain a reactant A;
• S4, under nitrogen protection, suspending the HBP obtained in the step S2 and triethylamine (TEA) in anhydrous tetrahydrofuran (THF), and stirring at 0° C. for 5 min to obtain a reactant B;
• and
• S5, dissolving the reactant A obtained in the step S3 in anhydrous THF, stirring uniformly, dropwise adding an obtained solution to the reactant B obtained in the step S4, heating an obtained mixture to room temperature, stirring overnight, removing the anhydrous THF using a rotary evaporator, redissolving an obtained product in anhydrous THF, and conducting dialysis for 24 h in a THF-water mixture system with a volume ratio of 1:1 to obtain the selenium-containing HBP.