A novel amphiphilic copolymer poly(ethylene glycol)-block-poly(N,N-dimethylamino-2-ethylmethacrylate)-blockpoly[6-(4-methoxy-azobenzene-4'-oxy) hexyl methacrylate](PEG-b-PDMAEMA-b-PMMAzo) was prepared by ATRP polymerization.The self-assembly and responsive behaviors were investigated by SEM,TEM,LLS and UV-Vis spectra.The results indicated that the copolymers can self-assemble into spherical structures in aqueous media.The aggregate size can be tuned by pH and temperature.The trans-cis isomerization behavior of the formed aggregates was also examined.Upon irradiation with a linear polarized light,the elongation degree of the aggregates was increased with the irradiation time.
