Polymeric micelles with carboxyl groups in the core(PMCC)were prepared by chemical cross-linking induced micellization of chlorinated polystyrene-b-poly(acrylic acid)(PS-b-PAA)by glycol in dichloromethane.The crosslinking of chlorinated PAA blocks results in the formation of micelle core,whereas PS block chains form the micelle shell.The chlorination of PAA produces anhydride groups,which make carboxyl groups during the crosslinking reaction with glycols,hence the resultant micelles contain carboxyl groups in the core.As the concentration of polymers can be as high as 50 g/mL,therefore,PMCC can be prepared with a high efficiency,and the powder micelle product was obtained by direct precipitation in methanol-water mixture.The PMCC were characterized by means of FTIR,1H NMR,DLS and SEM.
