Selectivity enhancement via photooxidative surface modification of polyimide air separation membranes

Autor:	Herber C. Klotz, Ingrid Kristine Meier, Michael Langsam
Rok vydání:	1994
Předmět:	chemistry.chemical_element Filtration and Separation Chromophore Photochemistry Biochemistry Oxygen Phthalimide chemistry.chemical_compound Monomer Membrane chemistry Polymer chemistry Surface modification General Materials Science Physical and Theoretical Chemistry Selectivity Polyimide
Zdroj:	Journal of Membrane Science. 94:195-212
ISSN:	0376-7388
DOI:	10.1016/0376-7388(93)e0174-i
Popis:	The scope and limitations of photooxidative surface modification of polyimide films were investigated as means of improving the selectives of air separation membranes without drastically reducing their permeabilities. Membranes of polyimides that contained the phthalimide chromophore and abstractable hydrogens showed significantly higher oxygen/nitrogen selectivities after being irradiated with ≈ 200–300 nm light in the presence of oxygen for 0.5·-30 min. Not only were benzylic hydrogens found to be abstractable, but also certain t -butyl hydrogens could be abstractable uder these conditions. A mechanism for the phtochemical reaction that is based on the photochemistry of structurally similar monomeric phthalimides is proposed to explain the observed selectivity enhancement.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5a455c1762d7b79c5e63459d73ce3345 https://doi.org/10.1016/0376-7388(93)e0174-i Zobrazit plný text záznamu