| 학회 |
한국고분자학회 |
| 학술대회 |
2009년 봄 (04/09 ~ 04/10, 대전컨벤션센터) |
| 권호 |
34권 1호 |
| 발표분야 |
고분자 구조 및 물성 |
| 제목 |
Closed-Loop Transition Induced by Homopolymers |
| 초록 |
The phase behavior for the binary mixtures of a polystyrene-block-poly(n-pentyl methacrylate) and homopolystyrenes with various molecular weights was investigated by depolarized light scattering and SAXS as a function of PS amount. A homopolymer-free PS-b-PnPMA, prepared by a HPLC technique, showed the entirely disordered (or homogeneous) state within experimental temperature range from the glass transition temperature (Tg) to the thermal degradation temperature (Td). By adding PS to this PS-b-PnPMA, the closed-loop phase behavior was observed for the binary mixtures where no macrophase separation occurred. With increasing molecular weight (chain length) of PS, the ordered range of the closed-loop extended remarkably and a critical amount of PS increased, resulting in the conservation of only lamellar morphology up to the overall PS volume fraction (fPS) of 0.70 for a PS, having a chain length ratio (α) of 2 with respect to the PS chain length of PS-b-PnPMA. ([email protected]) |
| 저자 |
김은혜1, 류두열1, 안형주1, 주원철2, 김진곤2, 정주은2, 장태현2
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| 소속 |
1연세대, 2포항공과대 |
| 키워드 |
Closed-Loop Phase transition; Homopolymer; Block copolymer
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| E-Mail |
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