Synthesis, characterization and studies of properties of six polyimides derived from two new aromatic diamines containing a central silicon atom
| Autor: | Cristina Alvarez, German Perez, Alain Tundidor-Camba, Pablo A. Ortiz, Claudio A. Terraza, Deysma Coll, Luis H. Tagle, J. G. de la Campa, J. Moncada |
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| Přispěvatelé: | Fondo Nacional de Desarrollo Científico y Tecnológico (Chile) |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Polymers and Plastics General Physics and Astronomy 02 engineering and technology 010402 general chemistry 01 natural sciences chemistry.chemical_compound Polymer chemistry Materials Chemistry Thermal stability Solubility Gas separation membrane chemistry.chemical_classification Biphenyl Organic Chemistry Thermal decomposition Polymer 021001 nanoscience & nanotechnology 0104 chemical sciences Monomer chemistry Aromatic polyimides 0210 nano-technology Glass transition Polyimide |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | Two series of novel aromatic polyimides (PIs) containing three polymers each one were prepared using two new aromatic silylated-diamine monomers. These monomeric diamines contain biphenylsilane units and biphenyl moieties in their structures. All PIs were obtained in high yield and the inherent viscosities were in the range of 0.44 to 0.82 dL/g. Polyimides showed excellent solubility in a wide variety of aprotic polar solvents, including THF and chloroform and were thermally stable with thermal decomposition temperature (TDT) over 500 °C and high glass transition temperatures (Tg) between 230 and 270 °C. Additionally, two films were prepared and gas transport properties were determined. These films offered a reasonably acceptable balance of permeability and selectivity with values close to a commercial polyimide (Matrimid), in particular for the CO/N gases pair. Experimental density of the films was measured and the fractional free volume was calculated. Tundidor-Camba, A. acknowledges the financial assistance by Fondo Nacional de Investigación Científica y Tecnológica, FONDECYT, through Project 11140133 and kindly thanks Cristina Álvarez for helping with the measurements of gas permeability. |
| Databáze: | OpenAIRE |
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