POLY 106 |
| It has recently been shown that the anthracene side chains of a helical polymer, poly[N-(1-anthryl)-N'-octadecylguanidine] (poly-1) move synchronously in response to a change in temperature when dissolved in certain solvents. We have used dielectric spectroscopy to probe whether these motions can occur in this polymer in the solid state. In order to characterize more fully the dielectric response of poly-1, we also investigated the dielectric properties of poly(N,N'-di-n-hexyl-guanidine), poly-2, which contains the same backbone as poly-1, but possesses hexyl side chains. We observe two peaks in the dielectric spectrum of poly-2. We assign the low temperature peak to motion of the hexyl side chains, and the high temperature peak to backbone motion. The dielectric spectrum of poly-1 has one peak which appears at a higher temperature than the peaks for poly-2. We assign the dielectric peak for poly-1 to motion of the anthracene units. We find that rather than moving independently (via Arrhenius dynamics), the movement of the side chains of poly-1 are correlated. This discovery that the anthracene units of poly-1 undergo correlated motion in the solid state is an important step in developing these unique polymers for practical applications such as molecular switches. |
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General Papers: Functional Materials
6:00 PM-8:00 PM, Sunday, August 19, 2007 BCEC -- Exhibit Hall - B2, Poster
Sci-Mix
Division of Polymer Chemistry |