| 초록 |
Micelles from amphiphilic block or graft copolymers can form various shapes in solution due to different solubility of their components. Size and shapes of micelles make them important materials in the field of drug delivery, collide application, coating and micro-reactor application. Investigations of oligothiophene derivatives have been of increasing interest recently not only as model compounds of polythiophenes but also very promising active organic semiconducting materials. In this study, oligothiophene and PEG are chosen for the preparation of amphiphilic T-shaped graft copolymer. Different length of oligothiophenes are hydrophobic-rigid backbone and different molecular weight of PEG are hydrophilic-flexible graft Poly(ethylene glycol) methyl ether 3-thiophene acetate was synthesized by DCC coupling of 3-thiopheneacetic acid and poly(ethylene glycol) methyl ether. It was then successively brominated at the 1, 4 position with N-bromosuccinimide followed by Stille coupling with 2-(tributylstannyl) thiophene for the preparation of different length of oligothiophene at the end of poly(ethylene glycol) monomethyl ether. Synthesized T-shaped oligothiophen-g-PEG copolymers are characterized by NMR and SEC. Micellar properties of T-shaped oligothiophene-g-PEG copolymer were investigated by UV/visible spectroscopoy, fluorescence spectroscopy, dynamic light scattering, and TEM. |
