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Free volume and gas permeation in anthracene maleimide-based polymers of intrinsic microporosity.

Khan MM, Filiz V, Emmler T, Abetz V, Koschine T, Rätzke K, Faupel F, Egger W, Ravelli L - Membranes (Basel) (2015)

Bottom Line: High free-volume copolymers were prepared via polycondensation with 2,3,5,6,-tetrafluoroterephthalonitrile (TFTPN) in which a portion of the 3,3,3',3'-tetramethyl-1,1'-spirobisindane (TTSBI) of PIM-1 was replaced with dibutyl anthracene maleimide (4bIII).An investigation of free volume using positron annihilation lifetime spectroscopy (PALS), and gas permeation measurements was carried out for the thin film composite copolymer membranes and compared to PIM-1.The average free volume hole size and the gas permeance of the copolymer membranes increased with decreasing TTSBI content in the copolymer.

View Article: PubMed Central - PubMed

Affiliation: Institute of Polymer Research, Helmholtz-Zentrum Geesthacht, Max-Planck-Str. 1, 21502 Geesthacht, Germany. muntazim.khan@hzg.de.

ABSTRACT
High free-volume copolymers were prepared via polycondensation with 2,3,5,6,-tetrafluoroterephthalonitrile (TFTPN) in which a portion of the 3,3,3',3'-tetramethyl-1,1'-spirobisindane (TTSBI) of PIM-1 was replaced with dibutyl anthracene maleimide (4bIII). An investigation of free volume using positron annihilation lifetime spectroscopy (PALS), and gas permeation measurements was carried out for the thin film composite copolymer membranes and compared to PIM-1. The average free volume hole size and the gas permeance of the copolymer membranes increased with decreasing TTSBI content in the copolymer.

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Related in: MedlinePlus

o-Ps intensities corresponding to o-Ps lifetimes in Figure 5 as a function of polymer variants (4bIII).
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membranes-05-00214-f006: o-Ps intensities corresponding to o-Ps lifetimes in Figure 5 as a function of polymer variants (4bIII).

Mentions: Figure 6 shows the intensities corresponding to the o-Ps lifetimes in Figure 5, which is proportional to the τo-Ps formation probability multiplied by the hole concentration. The o-Ps intensities do not show significant tendencies with the polymer variants. However, the data point for 100% and 2 keV is significantly lower, and the reason for this is not clear. Regardless, this does not affect the corresponding o-Ps lifetime.


Free volume and gas permeation in anthracene maleimide-based polymers of intrinsic microporosity.

Khan MM, Filiz V, Emmler T, Abetz V, Koschine T, Rätzke K, Faupel F, Egger W, Ravelli L - Membranes (Basel) (2015)

o-Ps intensities corresponding to o-Ps lifetimes in Figure 5 as a function of polymer variants (4bIII).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4496641&req=5

membranes-05-00214-f006: o-Ps intensities corresponding to o-Ps lifetimes in Figure 5 as a function of polymer variants (4bIII).
Mentions: Figure 6 shows the intensities corresponding to the o-Ps lifetimes in Figure 5, which is proportional to the τo-Ps formation probability multiplied by the hole concentration. The o-Ps intensities do not show significant tendencies with the polymer variants. However, the data point for 100% and 2 keV is significantly lower, and the reason for this is not clear. Regardless, this does not affect the corresponding o-Ps lifetime.

Bottom Line: High free-volume copolymers were prepared via polycondensation with 2,3,5,6,-tetrafluoroterephthalonitrile (TFTPN) in which a portion of the 3,3,3',3'-tetramethyl-1,1'-spirobisindane (TTSBI) of PIM-1 was replaced with dibutyl anthracene maleimide (4bIII).An investigation of free volume using positron annihilation lifetime spectroscopy (PALS), and gas permeation measurements was carried out for the thin film composite copolymer membranes and compared to PIM-1.The average free volume hole size and the gas permeance of the copolymer membranes increased with decreasing TTSBI content in the copolymer.

View Article: PubMed Central - PubMed

Affiliation: Institute of Polymer Research, Helmholtz-Zentrum Geesthacht, Max-Planck-Str. 1, 21502 Geesthacht, Germany. muntazim.khan@hzg.de.

ABSTRACT
High free-volume copolymers were prepared via polycondensation with 2,3,5,6,-tetrafluoroterephthalonitrile (TFTPN) in which a portion of the 3,3,3',3'-tetramethyl-1,1'-spirobisindane (TTSBI) of PIM-1 was replaced with dibutyl anthracene maleimide (4bIII). An investigation of free volume using positron annihilation lifetime spectroscopy (PALS), and gas permeation measurements was carried out for the thin film composite copolymer membranes and compared to PIM-1. The average free volume hole size and the gas permeance of the copolymer membranes increased with decreasing TTSBI content in the copolymer.

No MeSH data available.


Related in: MedlinePlus