Interaction of a Polymer of Intrinsic Microporosity (PIM-1) with Penetrants
American Journal of Applied Chemistry
Volume 3, Issue 3, June 2015, Pages: 139-146
Received: May 21, 2015; Accepted: Jun. 1, 2015; Published: Jun. 16, 2015
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Nhamo Chaukura, Polymer Science & Engineering Department, Harare Institute of Technology, Harare, Zimbabwe
Louise Maynard-Atem, School of Chemistry, University of Manchester, Manchester, UK
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The characterisation, solubility testing, and alcohol adsorption studies of PIM-1 are reported. Techniques used for characterisation are N2 sorption and ATR-FTIR analysis. A number of solvents were tested for their ability to dissolve low molecular weight (~30 000 gmol-1), medium molecular weight (~60 000 gmol-1), and high molecular weight (~120 000 gmol-1) PIM-1.Results showed solubility of PIM-1 in these solvents to be dependent on molar mass. CHCl3, tetrahydrofuran (THF), CH2Cl2, dicholobenzene (DCB), 1,2,4- trichlorobenzene (TCB), and acetophenone were found to be good solvents at all molecular weights. Treatment of PIM-1 with nonsolvents, namely: small alcohols and water, followed by solvent removal, caused swelling, resulting in an increase in BET surface area of about 11 %, except for water, which reduced BET surface area by the same amount (11 %). Methanol (MeOH) treatment resulted in a new population of micropores around 0.6 nm. The change after ethanol (EtOH) and propanol (PrOH) treatment was not as significant. Hydrogen bonding between alcohols and PIM-1 was also investigated using shifts in the frequencies of FTIR peaks for the ether and the nitrile functional groups. Nitrile group frequencies for the alcohols were consistently blue-shifted, whereas the ether frequencies were red shifted. Both red- and blue-shifts were used as a measure of hydrogen bond strength.
PIM-1, Solvents, Alcohols, Hydrogen-Bonding
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Nhamo Chaukura, Louise Maynard-Atem, Interaction of a Polymer of Intrinsic Microporosity (PIM-1) with Penetrants, American Journal of Applied Chemistry. Vol. 3, No. 3, 2015, pp. 139-146. doi: 10.11648/j.ajac.20150303.17
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