Novel crystalline structures of polyaniline
| Autor: | Y.F. Nicolau, D. Djurado |
|---|---|
| Rok vydání: | 1993 |
| Předmět: |
Materials science
Annealing (metallurgy) Mechanical Engineering Metals and Alloys Crystal structure Condensed Matter Physics Electronic Optical and Magnetic Materials Amorphous solid chemistry.chemical_compound Crystallinity Tetragonal crystal system Crystallography Monomer chemistry Mechanics of Materials Polyaniline Materials Chemistry Monoclinic crystal system |
| Zdroj: | Synthetic Metals. 55:394-401 |
| ISSN: | 0379-6779 |
| DOI: | 10.1016/0379-6779(93)90964-x |
| Popis: | Leucoemeraldine base having a crystallinity Xc = 40% was obtained by thermal annealing up to 300°C of its amorphous form. WAXD pattern of leucoemeraldine base is interpreted on the basis of a monoclinic unit cell having a 2/m Laue symmetry containing four monomer units: a = 8.34(5), b = 5.21(4), c = 9.52(8), A , β = 93.2(6)° . A new crystalline structure, ES-I-1 (Xc = 48%), of emeraldine hydrochloride (E.HCl) having a Cl/N mole ratio of ∼ 2/3 was obtained by cyclic annealing of the E.HCl (ES-I form) in 1M HCl between 25 and 100°C. WAXD pattern of ES-I-1 is interpreted on the basis of a tetragonal unit cell having a 4/m Laue symmetry: a = b = 13.4(0), c = 6.27(6) A . |
| Databáze: | OpenAIRE |
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