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Access and use of this website and the material on it are subject to the Terms and Conditions set forth at An efficient method for preparing high molecular weight polymers of intrinsic microporosity (PIM)s with cyclic-free structure via fast
polycondensation
Nanostructured Membranes I – 6
Monday July 14, 5:00 PM-5:30 PM, Moloka’i
An Efficient Method for Preparing High Molecular Weight Polymers of Intrinsic Microporosity (PIM)s with Cyclic-Free Structure via Fast Polycondensation
N. Du (Speaker), Institute for Chemical Process and Environmental Technology, National
Research Council, Ottawa, Ontario, Canada
G. Robertson, Institute for Chemical Process and Environmental Technology, National Research Council, Ottawa, Ontario, Canada
J. Song, Institute for Chemical Process and Environmental Technology, National Research Council, Ottawa, Ontario, Canada
S. Thomas, Membrane Technology and Research, Menlo Park, CA, USA I. Pinnau, Membrane Technology and Research, Menlo Park, CA, USA
M. Guiver, Institute for Chemical Process and Environmental Technology, National Research Council, Ottawa, Ontario, Canada, michael.guiver@nrc-cnrc.gc.ca
Recently, a British research group, reported on the syntheses of a number of wholly aromatic glassy ladder polymers, referred to as Polymers of Intrinsic Microporosity (PIM)s, via irreversible polycondensations at 65°C for 72 h. These polymers have attracted great interest as an outstanding class of advanced polymeric materials for membrane-based gas separation due to their rigid and contorted zig-zag chain structure and loose chain packing that is capable of generating very high free volume. In our work, a successful synthetic approach to high molecular weight linear ladder polymers with few low molecular weight cyclic species was carried out at elevated temperature and high monomer
concentration. In contrast with previously reported conditions for preparing these PIM materials, the reaction could be completed within a few minutes. The
polymer properties were characterized by GPC, 1HNMR, 13CNMR, FNMR, FT-IR, and MALDI-TOF MS. This procedure can also be used for the general synthesis of other ladder polymers by irreversible polycondensation of tetraphenols with activated tetrafluoro aromatics. Gas permeability coefficients (P) were measured for helium, hydrogen, carbon dioxide, oxygen, methane and nitrogen. PIM-1 exhibits high gas permeability coupled with moderate selectivity. For example, the oxygen permeability of PIM-1, made by the new synthetic method, is 1,650 Barrer coupled with an oxygen/nitrogen selectivity of 3.3.
