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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

Anthracene maleimide comonomer structure.
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membranes-05-00214-f001: Anthracene maleimide comonomer structure.

Mentions: As already pointed out in previous studies, the monomers such as ethanoanthracene or dialkyl anthracene maleimide, instead of the tetrahydroxy spirobisindane, may be also used to yield PIMs [37,38]. The homopolymers and copolymers obtained from dibutyl anthracene maleimide were soluble in most of the organic solvents and are characterized as “roof-shaped” resulting from the maleimide bridge over the anthracene ring (Figure 1). Anthracene maleimide introduces a “bend” into the polymer structure, and it is expected to be less flexible than a spiro-center, which involves a single tetrahedral carbon atom. This could modify the packing of the polymer chains and so affect the free volume in the desired way.


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)

Anthracene maleimide comonomer structure.
© Copyright Policy
Related In: Results  -  Collection

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

membranes-05-00214-f001: Anthracene maleimide comonomer structure.
Mentions: As already pointed out in previous studies, the monomers such as ethanoanthracene or dialkyl anthracene maleimide, instead of the tetrahydroxy spirobisindane, may be also used to yield PIMs [37,38]. The homopolymers and copolymers obtained from dibutyl anthracene maleimide were soluble in most of the organic solvents and are characterized as “roof-shaped” resulting from the maleimide bridge over the anthracene ring (Figure 1). Anthracene maleimide introduces a “bend” into the polymer structure, and it is expected to be less flexible than a spiro-center, which involves a single tetrahedral carbon atom. This could modify the packing of the polymer chains and so affect the free volume in the desired way.

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