| 초록 |
Polymeric micelles are formed in aqueous media by self-assembly of amphiphilic block copolymers. Each block can be designed in an optimum way for the desired use so that different functions are separated within one molecule. Generally, stimuli-responsive polymeric micelles are composed of a hydrophilic shell and a responsive hydrophobic core with tunable solubility that depends on external stimuli. If a responsive hydrophobic core contains light sensitive moieties which induce E/Z isomerization, one can have broad applications in switching devices and sensors. For this purpose, a benzylidene oxazolone-derivatized block copolymers were synthesized via ATRP of 3-vinylbenzaldehyde using PEO-Br as an initiator. The resulting PEO-b-PVBA copolymers were reacted with hippuric acid to yield the target copolymers, PEO-b-BO. The Z isomer was the only product initially detected. Irradiation with UV light led to photoisomerization and subsequent conversion of the Z isomer to the E isomer. |
