Synthesis of barbell-like triblock copolymers,dendritic triazine-block-poly(ethylene glycol)-block-dendritic triazine and investigation of their solution behaviors

摘要

New bis-globular triblock copolymers containing poly(ethylene glycol) (PEG) as a core and triazine dendrons were synthesized.First generation (G_1) was prepared by coupling of hydroxyl group of poly(ethylene glycol) with cyanuric chloride in different solvents through two routes,in the first route reaction was carried out in the presence of sodium hydride in dry DMF at low temperature and in another route water solution of sodium hydroxide in dichloromethane solvent was used.Reaction of compound G_1 with amino group of diethanolamine in dichloromethane resulted G_(1.5).Second generation of linear-dendritic compounds (G_2) was synthesized using coupling reaction of hydroxyl groups of compound G_(1.5) and 1 (compound 1 was prepared by reaction of cyanuric chloride with phenol in the presence of sodium hydroxide).Growth of dendrons on the PEG core and their structure was investigated using usual spectroscopy methods,SEC and CHN analysis.Critical micelle concentration and probable conformations of linear-dendritic compound G_2 was investigated using fluorescence and NMR spectroscopy in different solvents.