7 July 1997 Synthesis, preparation, and characterization of novel-ordered polydiacetylene thin films
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Techniques to overcome the limits of electronic data transmission have centered around the development of second and third order nonlinear optical devices. However, development of materials to make these devices has been slow. In order to maximize nonlinear optical response, it is necessary for the materials to be aligned in one direction. Various techniques that require extra energy have been used to accomplish this task. It would therefore be advantageous to develop a process which would take advantage of order enhancing groups to increase the alignment naturally. Polydiacetylenes are a class of conjugated polymers that possess large third order nonlinear optical responses. Their wide-ranging chemical and electronic properties and morphology make them very attractive materials for device applications. Paley, et al. developed a process called photodeposition in which a thin polymer film is deposited directly from monomer solution on to a variety of substrates. Utilization of this process to deposit ordered thin films will facilitate easy device preparation. We present synthetically prepared derivatives of a polydiacetylene, PDAMNA, which possess order encouraging side groups. Photodeposition of these compounds yield good optical quality thin films which display orientation normal to the substrate as determined by polarized UV-Vis spectroscopy. Furthermore, SEM micrographs show the chains normal to the surface and the subsequent decrease in order as the thickness increases. Energy calculations of the different conformers of the dimers shows a 24 kcal/mole difference between the alternating and non-alternating structures. These data show that partially ordered polydiacetylene thin films can be obtained through photodeposition.
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Daniel B. Wolfe, Daniel B. Wolfe, Mark Steven Paley, Mark Steven Paley, Donald O. Frazier, Donald O. Frazier, } "Synthesis, preparation, and characterization of novel-ordered polydiacetylene thin films", Proc. SPIE 3123, Materials Research in Low Gravity, (7 July 1997); doi: 10.1117/12.277717; https://doi.org/10.1117/12.277717

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