The effect of molecular imprinting on the pore size distribution of polymers |
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Authors: | Mohammad Al Kobaisi Margaret Tate Colin Rix Timur S Jakubov David E Mainwaring |
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Institution: | (1) School of Applied Sciences, Royal Melbourne Institute of Technology, Melbourne, 3001, Australia |
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Abstract: | Molecular imprinting techniques are becoming an increasingly important domain of porous polymers generally, to achieve molecule
specific recognition through morphology or stereochemistry of cavities. Imprinting is sought to increase both selectivity
and sensitivity where the polymer may be present as particulate, membrane or thin film forms. Here, we detail mechanisms involved
in the formation, stability and adsorption of binding sites, through the influence of polymerisation conditions and templates
on the porosity of highly crosslinked molecularly imprinted polymers (MIPs). Environmental control represents an important
area for porous polymers, here we focus on two template fungicides, iprodione and pyrimethanil, for ethylene glycol dimethacrylate
(EGDMA) based polymers. In general, control of the pre-polymerisation interactions were able to vary the surface areas of
polymers from 40–60 m2 g−1 to 300–436 m2 g−1 while pore sizes fell into distributions (a) close to the micropore region at ∼3.8 nm, (b) in the 10 to 20 nm mesopore region
and (c) in the 20 to 50 nm mesopore region. The importance of intermolecular interactions and aggregation in the pre-polymerisation
solution to the Brunauer, Emmett, Teller (BET) surface areas and pore size distribution of final polymers has been demonstrated
by systematic variation of chemical functionality. These effects confirm recent molecular dynamic simulation studies of MIP
formation and cavity stability. |
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Keywords: | Biochemical energy and environmental applications Fundamentals of adsorption Liquid phase adsorption |
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