Partially pyrolyzed membranes (PPMs) derived from copolyimides having carboxylic acid groups. Preparation and gas transport properties

Autor:	Alberto Tena, J. G. de la Campa, J. de Abajo, Angel E. Lozano, Eva M. Maya
Rok vydání:	2010
Předmět:	chemistry.chemical_classification Chemistry Carboxylic acid Filtration and Separation Biochemistry Membrane Volume (thermodynamics) Permeability (electromagnetism) Polymer chemistry General Materials Science Gas separation Physical and Theoretical Chemistry Selectivity Pyrolysis Nuclear chemistry
Zdroj:	Journal of Membrane Science. 349:385-392
ISSN:	0376-7388
DOI:	10.1016/j.memsci.2009.12.001
Popis:	A series of partially pyrolyzed membranes ( PPMs ) were prepared from a copolyimide having carboxylic acid pendant groups ( PIA ). The effect of the final pyrolysis temperature (425, 450 and 475 °C) on the gas separation properties was investigated and compared with those of PIA . The thermal treatments caused a progressive removal of the carboxylic acid pendant groups of PIA and a simultaneous increase of the fractional free volume of the PPMs . Thus, it was found that the permeability coefficients of PPMs were higher than that of PIA , between 6.5 and 25 times higher, depending on the gas tested and the final pyrolysis temperature, while the selectivity slightly decreased. All PPMs were attractive materials to separate CO 2 from CH 4 since were inside the commercially interesting region and are close to the present Robeson trade-off limit line. The pyrolysis at 475 °C yielded the PPM with the best performance: CO 2 /CH 4 selectivity of 47 and CO 2 permeability close to 95 barrers.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::372bc04fd9d3dd92c44aa8320f70aef2 https://doi.org/10.1016/j.memsci.2009.12.001 Zobrazit plný text záznamu Full Text from ScienceDirect