| 학회 |
한국화학공학회 |
| 학술대회 |
2004년 봄 (04/23 ~ 04/24, 공주대학교) |
| 권호 |
10권 1호, p.19 |
| 발표분야 |
고분자 |
| 제목 |
Scattering Studies on the Order-order Transitions in Block Copolymer Solutions |
| 초록 |
The phase behavior of a symmetric styrene-isoprene (SI) diblock copolymer in styrene-selective solvents was investigated by in-situ small angle X-ray scattering on shear-oriented solutions. When marginally good solvent was used, intriguing morphological change among close-packed spheres, body-centered cubic spheres, and hexagonally packed cylinders has been observed by varying temperature presumably due to the reduced repulsive interaction. We have shown that the temperature-induced changes in micellar characteristics, particularly in the mean aggregation number, can be quantified in dilute solution, and that this information provides a good guideline to interpret the observed order-order transitions of block copolymer solutions in high concentration. Two nearly symmetric SI copolymers containing perdeuterated block (PS-dPI and dPS-PI) were synthesized and the scattered intensity for these solutions was measured as a function of temperature on the 30 m NG7 spectrometer at NIST. The experimental results obtained demonstrate that the softening of inter-micelle potential with decrease in aggregation number would be the key feature for the various phase transitions. |
| 저자 |
박문정1, 차국헌1, Timothy P. Lodge2
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| 소속 |
1서울대, 2Univ. of Minnesota |
| 키워드 |
order-order transition; shear flow; block copolymer solution; small angle scattering;
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| E-Mail |
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| VOD |
VOD 보기 |
| 원문파일 |
초록 보기 |
