期刊
SCIENCE
卷 330, 期 6005, 页码 808-811出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1195302
关键词
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资金
- Japan Society for the Promotion of Science
- Ministry of Education, Culture, Sports, Science, and Technology, Japan [21350108]
- Grants-in-Aid for Scientific Research [21350108] Funding Source: KAKEN
Rational molecular design and processing, enabling large-area molecular ordering, are important for creating high-performance organic materials and devices. We show that, upon one-step hot-pressing with uniaxially stretched Teflon sheets, a polymer brush carrying azobenzene-containing mesogenic side chains self-assembles into a freestanding film, where the polymer backbone aligns homeotropically to the film plane and the side chains align horizontally. Such an ordered structure forms through translation of a one-dimensional molecular order of the Teflon sheet and propagates from the interface macroscopically on both sides of the film. The resultant wide-area bimorph configuration allows the polymer film to bend rapidly and reversibly when the azobenzene units are photoisomerized. The combination of polymer brushes with hot-pressing and Teflon sheets provides many possibilities in designing functional soft materials.
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