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Lookup NU author(s): Emeritus Professor Keith Scott
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A series of composites, some with permanent porosity, comprising polymers and ionic liquids have been prepared by in-situ polymerization. The characteristics of both composites and isolated polymers have been investigated. Slow mass and phase transfer characterize the interaction with a range of polymers (1-17) in the N,N′-dialkylimidazolium liquids, [emin]BF4, [bmim]PF6, or [omim]N(SO2CF3)2. Free-radical homopolymerization of 1-vinyl-2-pyrrolidinone in [bmim]PF6 or of 4-vinylpyridine in [omim]N-(SO2CF3)2 gave viscous solutions from which polymer (Mw = 162 500 and 71 500 g mol-1, respectively) could be isolated. Detectable ionic liquid residues were retained in the isolated polymers despite five reprecipitations from methanol. Copolymerization of 4-vinylpyridine (VP) with 5% divinylbenzene (DVB) or trimethylolpropane trimethacrylate (TRIM) in [omim]N(SO2CF3)2, and homopolymerizations of the cross-linking monomes on their own, led with 90-100% monomer conversion to a series of gel-like composite materials, B-H, from which gross-linked polymers, B′-H′, could be isolated by Soxhlet extraction of the ionic liquid. Copolymers of VP with 5-30% DVB (E′, F′) showed a low degree of permanent porosity in the dry state. However, poly(DVB) (G′) and poly(TRIM) (H′) have bulk densities (<0.6 g cm-3), intrusion volumes (>0.9 cm3 g-1), BET surface area (70-320 m2 g-1), and morphology (from SEM studies) which demonstrate the porogenic character of the ionic liquids used. Comparisons with the related products I and J obtained in toluene reveal the sensitivity of these systems both to the properties of the porogen solvent and to the monomer used.
Author(s): Snedden P, Cooper AI, Scott K, Winterton N
Publication type: Article
Publication status: Published
Journal: Macromolecules
Year: 2003
Volume: 36
Issue: 12
Pages: 4549-4556
ISSN (print): 0024-9297
ISSN (electronic): 1520-5835
Publisher: American Chemical Society
URL: http://dx.doi.org/10.1021/ma021710n
DOI: 10.1021/ma021710n
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