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Polybenzimidazole as a Promising Support for Metal Catalysis: Morphology and Molecular Accessibility in the Dry and Swollen State
Author(s) -
D'Archivio A. A.,
Galantini L.,
Biffis A.,
Jeřábek K.,
Corain B.
Publication year - 2000
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/(sici)1521-3765(20000303)6:5<794::aid-chem794>3.0.co;2-x
Subject(s) - tetrahydrofuran , toluene , porosimetry , scanning electron microscope , chemistry , acetone , materials science , chemical engineering , polymer chemistry , organic chemistry , porosity , porous medium , solvent , composite material , engineering
Polybenzimidazole (PBI) in beaded form (250‐500 μm) has been characterized in the dry state by scanning electron microscopy (SEM), BET, and nitrogen porosimetry. In the swollen state, it has been characterized by inverse steric exclusion chromatography (ISEC) in tetrahydrofuran, toluene, and water, by ESR of TEMPONE (2,2,6,6‐tetramethyl‐4‐oxo‐1‐oxypiperidine), and pulse field gradient spin echo (PGSE) NMR spectroscopy, toluene, in tetrahydrofuran, ethanol and water. The dry‐state results are in good agreement with the ISEC results obtained in tetrahydrofuran, toluene, and water with regard to the 40–;80 nm macroporosity. The swelling‐dependent surface area and pore volume detected by ISEC in toluene and water reveal the amphiphilic nature of PBI.