| 학회 | 한국고분자학회 |
| 학술대회 | 2003년 봄 (04/11 ~ 04/12, 연세대학교) |
| 권호 | 28권 1호, p.67 |
| 발표분야 | 고분자 구조 및 물성 |
| 제목 | Phase Behavior of deuterated polystyrene-block-poly(n-pentyl methacrylate) copolymers |
| 초록 | Diblock copolymers comprised of polystyrene covalently linked to poly(n-pentylmethacrylate), PS-b-PnPMA, copolymers with only weak segmental interactions, are shown to exhibit a closed-loop phase behavior over a narrow range of molecular weight. The endothermic transitions from the disordered to ordered state and back into the disordered state, as a function of increasing temperature, are driven by delicate balances between weak segmental interactions and the entropy resulting from the mismatch in compressibility in addition to translational entropy. Flory interaction parameters were acquired by means of mean-field theory using small angle neutron scattering experiment. Nonlinearity of χ with inverse temperature was found in the homogeneous diblock copolymer. These behaviors can be attribute to the closed-loop phase behavior in the diblock copolymer and the UCST and LCST in the Homopolymer blend system. This work was supported by National RND Program (M1-0214-00-0230) by MOST, and by National Research Laboratory Program. |
| 저자 | 류두열;정운용;이동현;김진곤;T.P.Russell |
| 소속 | 포항공대화공과;포항공대화공과;포항공대화공과;포항공대화공과;UMASS |
| 키워드 | Block copolymer; interaction parameter |
