Two Nanoporous Crystalline Forms of Poly(2,6-dimethyl-1,4-phenylene)oxide and Related Co-Crystalline Forms
| Autor: | Finizia Auriemma, Paola Rizzo, Gaetano Guerra, Christophe Daniel, Claudio De Rosa, Baku Nagendra, Anna Nuzzo, Oreste Tarallo, Antonietta Cozzolino, Massimo Christian D'Alterio |
|---|---|
| Přispěvatelé: | Nagendra, B., Cozzolino, A., Daniel, C., Rizzo, P., Guerra, G., Auriemma, F., De Rosa, C., D'Alterio, M. C., Tarallo, O., Nuzzo, A. |
| Rok vydání: | 2019 |
| Předmět: |
Diffraction
Materials science Polymers and Plastics Nanoporous Infrared Organic Chemistry Oxide 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Inorganic Chemistry Crystallography chemistry.chemical_compound symbols.namesake Fourier transform chemistry Phenylene Materials Chemistry symbols Fourier transform infrared spectroscopy 0210 nano-technology |
| Zdroj: | Macromolecules. 52:9646-9656 |
| ISSN: | 1520-5835 0024-9297 |
| Popis: | Extensive characterizations, mainly by wide-angle X-ray diffraction (WAXD) and Fourier transform infrared (FTIR) techniques, are reported for co-crystalline (CC) poly(2,6-dimethyl-1,4-phenylene)oxide (PPO) films with many different low-molecular-mass guest molecules. These characterizations are also reported for the corresponding nanoporous crystalline (NC) phases, as obtained by suitable guest-removal procedures. Two well-separated NC forms, hereafter named α and β, are obtained by guest removal from two well-separated groups of CC forms. α and β NC forms can be easily recognized by reflections in WAXD patterns as well as by suitable FTIR crystalline peaks. Density and degree of crystallinity measurements confirm that both NC phases exhibit a density definitely smaller than for the amorphous phase (ρam = 1.04 g/cm3 > ρβ = 0.95 g/cm3 > ρα = 0.93 g/cm3). Density functional theory calculations combined with geometrical analysis on PPO model systems indicate conformations suitable to fit the observed chain periodicities of the two crystalline forms (c = 5.28 and 5.47 Å, for α and β NC forms, respectively). |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|