| 초록 |
We studied the phase behavior of poly(2-vinyl pyridine)-block-poly(4-vinyl pyridine) copolymer(P24VP) with gold nanoparticles via rheometry, small angle X-ray scattering(SAXS), and differential scanning calorimetry(DSC). Although both blocks of P24VP exhibit attractive interaction to gold nanoparticles, we found it shows the unusual phase behavior as increasing the amount of gold nanoparticles. At first, the order-to-disorder transition temperature(TODT) of P24VP with gold nanoparticles was found, and decreased with more gold nanoparticles. As increasing the amount of gold nanoparticles, it increased, but again decreased. To prove this unusual behavior, we compare two reference block copolymers polystyrene-block-poly(4-vinyl pyridine) and polystyrene-block-poly(2-vinyl pyridine). Finally, we found that the gold particles interacts with monomers sequentially. Moreover, in order to prove sequential interaction, we checked particle distribution by TEM and HADDF-STEM for composite samples. |
