Positronium annihilation data and actual free-volume distribution in polymers

Shantarovich, V. P.; Suzuki, Takenori; Yampolskii, Yu. P.; Budd, Peter M.; Gustov, V. V.; Kevdina, I. B.; Пастухов, А. В.; Berdonosov, S. S.; Bozhevol’nov, V. E.

doi:10.1134/s0018143907050128

Cited by 13 publications

(12 citation statements)

References 36 publications

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“…Figure 12 demonstrates probability density function for annihilation with a given lifetime typical for the CPS(0.3)200E and LPS200X polymers. Remarkably that, as it was discussed earlier, 36,44,45 in the systems of large pores, lifetimes at low temperatures are longer than those at high temperatures due to a specificity of the positronium motion in a large pore 10,46 and variations sometimes are not linear (Fig. 13).…”

Section: Polymer Sorbents Made Of Super-crosslinked Polystyrene Pal Ementioning

confidence: 62%

“…This uncertainty can be solved, and heterogeneity can be checked using the effect of thermostimulated luminescence (TSL) of the preliminarily irradiated samples. 44 The conclusion is based on the fact that the intensity of the TSL spectrum at different temperatures depends on the mobility of the polymer structure at these temperatures. High temperature luminescence means formation of the elements of rigid structure, which are able to trap and to keep electrons up to relatively high temperatures.…”

Section: Supplementary Experimentsmentioning

confidence: 99%

“…Temperature dependence of the integral intensity of TSL effect in polystyrene (PS) and in the super-crosslinked systems synthesized on this basis: CPS(0.3)150E, LPS150X, and LPS200X. 44 HIGHLIGHT approach is dependent on some suggestions on the mechanism of formation of the trapped positronium. In fact, the limiting factor in the formation of the trapped Ps is not known.…”

Section: Concentration Of Elementary Free Volumes In Membrane Materialsmentioning

confidence: 99%

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Positron annihilation and free volume studies in polymer glasses

Shantarovich

2008

J Polym Sci B Polym Phys

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Section: Polymer Sorbents Made Of Super-crosslinked Polystyrene Pal Ementioning

confidence: 62%

Section: Supplementary Experimentsmentioning

confidence: 99%

Section: Concentration Of Elementary Free Volumes In Membrane Materialsmentioning

confidence: 99%

See 1 more Smart Citation

Positron annihilation and free volume studies in polymer glasses

Shantarovich

2008

J Polym Sci B Polym Phys

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“…These values are very similar to those of microporous inorganic materials such as carbons, clearly indicating that the polymers have intrinsic microporosity. Based on positron annihilation lifetime spectroscopy (PALS) studies, both PIM-1 and PTMSP have a bimodal pore size distribution [42,43]. Both polymers have chain (pore) spacings of about 5-12 Å [43].…”

Section: Film Characterizationmentioning

confidence: 99%

Pure- and mixed-gas permeation properties of a microporous spirobisindane-based ladder polymer (PIM-1)

Thomas

Pinnau

et al. 2009

Journal of Membrane Science

257

122

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a b s t r a c t PIM-1, a glassy, spirobisindane-based ladder polymer is a novel intrinsically microporous membrane material. The pure-and mixed-gas permeation properties of PIM-1 are compared to those of highly permeable, microporous, linear chain, acetylene-based polymers, such as poly(1-trimethylsilyl-1-propyne) (PTMSP). PIM-1 exhibits very high permanent gas permeabilities coupled with moderate selectivities. For example, the oxygen permeability of PIM-1 at 25 • C is 1300 × 10 −10 cm 3 (STP) cm/cm 2 s cmHg combined with an oxygen/nitrogen selectivity of 3.8. Those values place PIM-1 above the Robeson trade-off curve for oxygen/nitrogen separation. Like microporous linear chain PTMSP, ladder-type PIM-1 is more permeable to large, condensable organic vapors, such as n-butane, than to small, permanent gases, such as methane. PIM-1 exhibits a mixed-gas n-butane/methane selectivity of up to 25, which is similar to that of PTMSP, the most permeable and selective polymer known for this separation. Because PIM-1 has significantly better solvent resistance than PTMSP, it could find applications as an advanced membrane material for the separation of organic vapor/permanent gas mixtures.

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“…The measured o‐Ps lifetime and intensities of the pure unused PIM‐1 are in the range of literature reported values and at 4 keV in the range of bulk PIM‐1, even though some investigations separated the o‐Ps into two components instead of introducing a dispersion …”

Section: Discussionmentioning

confidence: 51%

Correlation of gas permeation and free volume in new and used high free volume thin film composite membranes

Koschine

Rätzke

Faupel

et al. 2014

J Polym Sci B Polym Phys

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Polymeric gas separation membranes frequently undergo the phenomenon of aging, that is, performance parameters like permeability decrease with storage or usage time. Here, we report on a new approach of reducing aging by incorporation of functionalized multiwalled carbon nanotubes into a polymer of intrinsic microporosity. Free volume and permeability measurements clearly show a reduced aging with incorporation of the carbon nantubes. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2015, 53, 213–217

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Positronium annihilation data and actual free-volume distribution in polymers

Cited by 13 publications

References 36 publications

Positron annihilation and free volume studies in polymer glasses

Positron annihilation and free volume studies in polymer glasses

Pure- and mixed-gas permeation properties of a microporous spirobisindane-based ladder polymer (PIM-1)

Correlation of gas permeation and free volume in new and used high free volume thin film composite membranes

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