Colour and chromism of conjugated polymers
- 1 January 1988
- journal article
- research article
- Published by Informa UK Limited in Contemporary Physics
- Vol. 29 (1), 3-31
- https://doi.org/10.1080/00107518808213749
Abstract
Long-chain conjugated polymers are described which have electronic transitions with energies of approximately 2–4 eV. Excitation of these transitions by electromagnetic radiation results in strong absorption bands in the visible region of the spectrum and hence a coloured appearance to the polymer. It is shown that the energy of the excitations, and hence the colour of the polymers, is dependent upon factors such as the length of the polymer chain, the environment in which it is located and the backbone conformation. The absorption spectrum is so sensitive to these and other factors that small changes may lead to chromism, a dramatic change in colour of the polymer. Polymers that exhibit thermochromism, solvatochromism, electrochromism and other colour changes are discussed. The changes in colour are interpreted as arising primarily from changes in the structure of the polymer. The existing and potential technological applications or chromism in conjugated polymers are considered.Keywords
This publication has 24 references indexed in Scilit:
- Theoretical charge and conductivity ‘state - diagrams’ for polyaniline versus potential and pHSynthetic Metals, 1987
- Resonance raman spectroscopy of polydiacetylene langmuir‐blodgett filmsBritish Polymer Journal, 1985
- Spectroscopic and light scattering studies of the conformational (rod-to-coil) transition of poly(diacetylene) in solutionThe Journal of Chemical Physics, 1985
- Pressure dependence of the 2 eV electronic transition of a polydiacetyleneJournal of Physics C: Solid State Physics, 1984
- Structure-property relationships of diacetylenes and their polymersJournal of Macromolecular Science, Part B, 1981
- Morphology and structure of heavily deformed single crystals of a polydiacetylene. II. Resonance raman and optical spectroscopyJournal of Polymer Science: Polymer Physics Edition, 1981
- Thermochromism in polydiacetylene solutionsJournal of Polymer Science: Polymer Physics Edition, 1980
- A visual conformational transition in a polymer solutionJournal of Polymer Science Part C: Polymer Letters, 1978
- Optical properties of bis(p-toluene sulphonate)diacetylene. I. Crystal optics of partially and fully polymerized crystalsphysica status solidi (a), 1976
- Thermal expansion and compressibility in the chain direction of a polydiacetylene single crystalJournal of Polymer Science: Polymer Physics Edition, 1976