Materials
All the chemicals used in the production process are commercially
available and did not require further refinement.o -phenylenediamine (o -PD), N,N-dimethylformamide (DMF),
n-Hexane, dichloromethane (DCM), dibutyltin dilaurate (DBTDL) were
purchased from Shanghai Macklin Biochemical Co., Ltd.
2-amino-4-hydroxy-6-methylpyrimidine (UPy) was purchased from Shanghai
yuanye Bio-Technology Co.,Ltd. 1, 6-hexad -iisocyanate was purchased
from Energy Chemical of Sahn Chemical Technology (Shanghai) Co., LTD.
ethylenediamine tetraacetic acid (EDTA) was
purchased from Aladdin Industrial
Corporation (Shanghai, China) .Ultrapure water from the Millipore system
was used in all experiments.