Observation of glass‐like behavior in conjugated polymer molecules
| Autor: | William M. Risen, Jung‐Mi Y. Ha, Richard M. Stratt |
|---|---|
| Rok vydání: | 1984 |
| Předmět: |
chemistry.chemical_classification
Phase transition Chemistry General Physics and Astronomy Polymer Conjugated system Photochemistry Resonance (chemistry) symbols.namesake Phase (matter) Metastability symbols Astrophysics::Solar and Stellar Astrophysics Organic chemistry Physical and Theoretical Chemistry Raman spectroscopy Polydiacetylenes |
| Zdroj: | The Journal of Chemical Physics. 81:2855-2856 |
| ISSN: | 1089-7690 0021-9606 |
| DOI: | 10.1063/1.447959 |
| Popis: | Soluble substituted polydiacetylenes (a class of conjugated polymers) undergo a variety of phase transitions signaled by color changes. The particular example we studied, poly‐3BCMU in chloroform/hexane solutions, exhibits a low temperature blue phase and a high temperature yellow phase. The visible and resonance Raman spectra of both the blue and yellow forms dispaly coexisting conjugation length regimes of 6, 10, and >20 monomers. However, we find that the relative proportions of these regimes indicates that that are three, rather than two, different phases: an equilibrium blue phase, an equilibrium yellow phase, and a metastable blue phase containing short conjugation lengths quenched in. It is this last phase which we characterize as glass‐like. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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