| 초록 |
The A-B rod-coil block copolymers have been introduced with various synthetic routes because they have interesting properties such as phase separation with different volume fractions. Especially rod-coil molecules based on poly(n-hexyl isocyanate)s (PHIC)s have been reported to exhibit various morphologies according to different fraction of rod block of PHIC. Among the synthetic methods of block copolymer, living anionic polymerization technique is one of useful methods to achieve controlled polymer architecture, controlled molecular weight, narrow molecular weight distribution, and well-defined structures. In this study, the flexible coil type Poly(2-vinylpyridine) and rigid-rodlike Poly(n-hexyl isocyanate) block copolymers, P(2VP-b-HIC)s, were synthesized with quantitative yields and controlled molecular weights via living anionic polymerization in THF at combination of -78℃ and -98℃ using K-DPM (Potassium Diphenylmethane) as an initiator in the presence of NaBPh4 as a common ion salts to prevent side reactions(trimerization of PHIC) with various block ratios and molecular weights. For the applications, we synthesized block copolymers with various volume fractions between P2VP and PHIC. Characterization of the obtained block copolymer by SEC-LS, NMR spectroscopy, DSC, TGA and TEM, AFM demonstrated that well-defined coil-rod block copolymers can be synthesized. |
