| 학회 | 한국고분자학회 |
| 학술대회 | 2002년 봄 (04/12 ~ 04/13, 서울대학교) |
| 권호 | 27권 1호, p.59 |
| 발표분야 | 고분자 구조 및 물성 |
| 제목 | Close-loop type of ordering transition for a Diblock copolymer melt |
| 초록 | Block copolymers have lamellar (LAM), hexagonally packed cylinders (HEX), and body centered cubic (BCC) microdomains depending upon the block length ratio as well as temperature. Almost all block copolymers, for instance, polystyene-block-polyisoprene, poly(ethyl ethylene)-block-poly(ethyl propylene), have the order to disorder transition (UODT) upon heating, whereas PS-block-poly(n-butyl methacrylate) copolymer has the disorder to order transition (LCOT) upon heating. In this study, we report for the first time the existence of simultaneous LCOT at lower temperatures and UCOT at higher temperatures, namely close loop type of ordering transition, in the aid of synchrotron small angle X-ray scattering (SAXS), rheometry, and transmission electron microscopy (TEM). This work was supported by Applied Rheology Center governed by KOSEF and by the Teralevel Nanodevices Projects by MOST. Synchrotron SAXS at the PLS (3C2 and 4C1 beam lines) were supported by the Ministry of Science and Technology (MOST) and Pohang Iron and Steel Co. (POSCO). Synchrotron SANS at the Hanaro was supported by MOST. |
| 저자 | 류두열1, 정운용2, 김진곤3, Thomas P. Russell* |
| 소속 | 1포항공대 화공과, 2*Department of Polymer Science and Engineering Univ. of Massachusetts, 3Amherst |
| 키워드 | |
| VOD | VOD 보기 |
