Visual Indicator for Trace Organic Volatiles

Rakow, Neal A.; Wendland, Michael S.; Trend, John E.; Poirier, R.; Paolucci, Dora M.; Maki, Stephen P.; Lyons, Christopher S.; Swierczek, Mary J.

doi:10.1021/la903483q

Cited by 62 publications

(51 citation statements)

References 17 publications

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“…The ability to cast polymeric membranes opens up a commercially promising avenue for possible applications. PIM-1 membrane fabrication has been limited to a select group of solvents including chloroform [10,11], THF and more recently chlorobenzene [12]. The choice of solvent can have an important effect on the properties of the resulting membrane.…”

Section: Polymer Solubilitymentioning

confidence: 99%

Interaction of a Polymer of Intrinsic Microporosity (PIM-1) with Penetrants

Chaukura¹

2015

AJAC

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Abstract:The characterisation, solubility testing, and alcohol adsorption studies of PIM-1 are reported. Techniques used for characterisation are N 2 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. CHCl 3 , tetrahydrofuran (THF), CH 2 Cl 2 , 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.

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Section: Polymer Solubilitymentioning

confidence: 99%

Interaction of a Polymer of Intrinsic Microporosity (PIM-1) with Penetrants

Chaukura¹

2015

AJAC

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“…The intrinsic fluorescence of PIM-1 has also been exploited in sensors described in patents and enabled the fabrication of a laser sensor with great sensitivity for the detection of nitrated aromatics [136]. A colorimetric optical sensor based on the rapid change in refractive index of a thin film of PIM-1 on adsorption of organic vapor provides a dramatic green-to-red color change, which can be visualised for sensing concentrations in air down to 50 ppm or, if using a fibre-optic spectrometer, down to 50 ppb [137,138]. The optical response is general for all organic vapors but the hydrophobic nature of PIM-1 ensures the lack of interference by humidity.…”

Section: Sensorsmentioning

confidence: 99%

Polymers of Intrinsic Microporosity

McKeown

2012

ISRN Materials Science

185

136

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This paper focuses on polymers that demonstrate microporosity without possessing a network of covalent bonds-the so-called polymers of intrinsic microporosity (PIM). PIMs combine solution processability and microporosity with structural diversity and have proven utility for making membranes and sensors. After a historical account of the development of PIMs, their synthesis is described along with a comprehensive review of the PIMs that have been prepared to date. The important methods of characterising intrinsic microporosity, such as gas absorption, are outlined and structure-property relationships explained. Finally, the applications of PIMs as sensors and membranes for gas and vapour separations, organic nanofiltration, and pervaporation are described.

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“…Since Polymers of Intrinsic Microporosity (PIMs) were rst reported in 2004, 1 a range of potential applications have been identied including catalysis, 2-5 chiral separations, 6 and as the active material in sensors 7,8 or ionic diodes. 9,10 In particular, PIMs with the ability to form exible, robust, self-standing lms have potential as membrane materials for anionic transport, 11 the separation of gases, vapours 12 or for nanoltration.…”

Section: Introductionmentioning

confidence: 99%

A highly rigid and gas selective methanopentacene-based polymer of intrinsic microporosity derived from Tröger's base polymerization

et al. 2018

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Polymers of intrinsic microporosity (PIMs) have been identified as potential next generation membrane materials for the separation of gas mixtures of industrial and environmental relevance. Based on the exceptionally rigid methanopentacene (MP) structural unit, a Polymer of Intrinsic Microporosity (PIM-MP-TB) was designed to demonstrate high selectivity for gas separations. PIM-MP-TB was prepared using PIMs, PIM-MP-TB is prepared in four simple steps from a cheap starting material.

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Visual Indicator for Trace Organic Volatiles

Cited by 62 publications

References 17 publications

Interaction of a Polymer of Intrinsic Microporosity (PIM-1) with Penetrants

Interaction of a Polymer of Intrinsic Microporosity (PIM-1) with Penetrants

Polymers of Intrinsic Microporosity

A highly rigid and gas selective methanopentacene-based polymer of intrinsic microporosity derived from Tröger's base polymerization

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