Aging and Free Volume in a Polymer of Intrinsic Microporosity (PIM-1)

Harms, Stephan; Rätzke, Klaus; Faupel, Franz; Chaukura, Nhamo; Budd, Peter M.; Egger, Werner; Ravelli, L.

doi:10.1080/00218464.2012.682902

Cited by 83 publications

(81 citation statements)

References 26 publications

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“…However, there seems little evidence from other techniques to support the formation of a bimodal distribution in microporous polymers. PALS has been used to investigate the pore size distribution of PIM-1 and closely related PIMs, under a range of environments, relative to other high free volume polymers [75,94,95]. An unusual reduction in the apparent size of free volume elements is noted from PALS above 100…”

Section: Positron Annihilation Lifetime Spectroscopy (Pals)mentioning

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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Section: Positron Annihilation Lifetime Spectroscopy (Pals)mentioning

confidence: 99%

Polymers of Intrinsic Microporosity

McKeown

2012

ISRN Materials Science

185

136

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“…For example, their transient sorption kinetics cannot be described by the commonly used Fick's second law of diffusion. The second problem is the aging phenomenon [8], which causes a significant decrease of PIMs permeability over time [3,6,[9][10][11][12][13].…”

mentioning

confidence: 99%

“…To explore the aging phenomenon, various authors use different methods to monitor the aging of polymeric membranes. Some studies were focused on changes in the physical structures of polymers, detected using SAXS/WAXS [12] or PALS [9,30], while others were focused on the influence of aging on the permeability [10,11,[30][31][32]. Furthermore, theoretical computation methods [13] were reported as well.…”

mentioning

confidence: 99%

“…Furthermore, theoretical computation methods [13] were reported as well. However, only a few of the aforementioned studies mention the aging phenomenon in PIMs [9][10][11][12]. Moreover, to the best of our knowledge, there are neither studies about the nature (chemical or physical) of aging of PIMs, nor on the influences of the permeating compounds.…”

mentioning

confidence: 99%

“…In this work, PIM-1 [3] and PIM-EA-TB [5] (see Figure 1) were chosen from the family of polymers of intrinsic microporosity. PIM-1 is an archetypal polymer, which was the first prepared PIM and is currently the most studied one [3,7,[9][10][11][12][33][34][35]. PIM-EA-TB was chosen because of its unique properties, especially for its gas separation ability [5].…”

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confidence: 99%

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Aging of polymers of intrinsic microporosity tracked by methanol vapour permeation

Pilnáček

Vopička

Lanč

et al. 2016

Journal of Membrane Science

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The initially very promising transport properties of glassy high free volume polymers deteriorate rapidly over time. In this work, we focused on this aging phenomenon in two polymers of intrinsic microporosity (PIMs), namely PIM-1 and PIM-EA-TB. To identify the main mechanisms involved, we studied the time-declines of permeability and diffusivity of methanol vapours in flat membranes with approximately equal thicknesses. The permeation measurements were carried out using a continuous flow permeation method with carrier gas, where the methanol vapours were held at constant activity 0.2 at 25°C. Two different experimental modes were used: (i) continuous experiments that consisted of one long experiment with a duration of over 650 hours for each polymer and (ii) momentary experiments that consisted of a vast number of short (ca. 6 hours) consecutive measurements of transient permeation. The observed decreases of methanol permeability due to aging were more intense in the case of continuous mode for both polymers. In other words, the aging was ca.

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Polymers of Intrinsic Microporosity

McKeown

Budd

2013

Encyclopedia of Membrane Science and Technology

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Polymers of intrinsic microporosity (PIMs) are emerging as promising materials for making organic membranes. PIMs are high free volume polymers that behave as classical microporous materials as demonstrated by gas adsorption, despite lacking a network of covalent bonds. However, unlike network‐based microporous materials, they have the advantage of being soluble in organic solvents and are solution processable into forms suitable for membrane fabrication. The intrinsic microporosity of PIMs arises from the contorted shape and rigidity of the component macromolecules, which prevents space‐efficient packing. Here, the methods of synthesis of PIMs of relevance to membrane studies are described and important methods of characterizing intrinsic microporosity, such as gas absorption, are outlined and structure‐property relationships explained. Finally, the research on PIMs as membrane materials for organic nanofiltration, pervaporation, and particularly gas and vapor separations, are described.

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Aging and Free Volume in a Polymer of Intrinsic Microporosity (PIM-1)

Cited by 83 publications

References 26 publications

Polymers of Intrinsic Microporosity

Polymers of Intrinsic Microporosity

Aging of polymers of intrinsic microporosity tracked by methanol vapour permeation

Polymers of Intrinsic Microporosity

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