Abstract:
Using 2-Bromopropionyl bromide(BPB) as the initiator, CuBr/2, 2'-bipyridine(Bpy) as the catalyst and ligand, the poly(ethylene glycol) monomethyl ether with single-caped halogen(PMEG-Br) was synthesized by atom transfer radical polymerization(ATRP). Using PMEG-Br as the macroinitiator and CuBr/Bpy as the catalyst and ligand, the block copolymer PMEG-b-PMMA was then synthesized. The product was characterized by Fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance spectroscopy(NMR) and gel permeation chromatography (GPC). The reversed micellization solution of PMEG-b-PMMA in toluene was prepared by directly dissolving method, and PMEG-b-PMMA self-assembling behavior was investigated by TEM observation. The results show that the reversed micella with hydrophilic core and hydrophobic shell formed. With increase in the concentration of copolymer, these aggregates were found to undergo morphological transformations from spheres to cylinders, and eventually to reticulation structures.
