title: Azide-based cross-linking of polymers of intrinsic microporosity (PIMs) for condensable gas separation.
abstract: Cross-linked polymers of intrinsic microporosity (PIM)s for gas separation membranes, were prepared by a nitrene reaction from a representative PIM in the presence of two different diazide cross-linkers. The reaction temperature was optimized using TGA. The homogenous membranes were cast from THF solutions of different ratios of PIM to azides. The resulting cross-linked structures of the PIMs membranes were formed at 175 °C after 7.5 h and confirmed by TGA, XPS, FT-IR spectroscopy and gel content analysis. These resulting cross-linked polymeric membranes showed excellent gas separation performance and can be used for O(2) /N(2) and CO(2) /N(2) gas pairs, as well as for condensable gases, such as CO(2) /CH(4) , propylene/propane separation. Most importantly, and differently from typical gas separation membranes derived from glassy polymers, the crosslinked PIMs showed no obvious CO(2) plasticization up to 20 atm pressure of pure CO(2) and CO(2) /CH(4) mixtures.
authors.affiliation: Institute for Chemical Process and Environmental Technology, National Research Council of Canada, Ottawa, Ontario, K1A 0R6, Canada.
authors.forename: Naiying
authors.initials: N
authors.lastname: Du
authors.forename: Mauro M Dal-
authors.initials: MM
authors.lastname: Cin
authors.forename: Ingo
authors.initials: I
authors.lastname: Pinnau
authors.forename: Andrzej
authors.initials: A
authors.lastname: Nicalek
authors.forename: Gilles P
authors.initials: GP
authors.lastname: Robertson
authors.forename: Michael D
authors.initials: MD
authors.lastname: Guiver
mesh_terms: D001386:Azides / Q000737:chemistry*; D003432:Cross-Linking Reagents / Q000737:chemistry; D005740:Gases / Q000737:chemistry / Q000302:isolation & purification*; D008567:Membranes, Artificial; D010539:Permeability; D011108:Polymers / Q000737:chemistry*; D016062:Porosity
chemical_list: D001386:Azides; D003432:Cross-Linking Reagents; D005740:Gases; D008567:Membranes, Artificial; D011108:Polymers