Sorption and transport of small gas molecules in thermally rearranged (TR) polybenzoxazole membranes based on 2,2-bis(3-amino-4-hydroxyphenyl)-hexafluoropropane (bisAPAF) and 4,4′-hexafluoroisopropylidene diphthalic anhydride (6FDA)

Kim, Seungju; Jo, Hanik; Lee, Young Moo

doi:10.1016/j.memsci.2013.03.054

Cited by 65 publications

(61 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, various factors including precursor imidization method or thermal rearrangement mechanism also strongly influences as well. A c c e p t e d M a n u s c r i p t Various physical properties have been studied to characterize intrinsic polymer properties such as sorption properties, cavity size analysis, and thermal relaxation characteristics [53,[152][153][154][155][156][157][158][159][160][161][162][163][164][165]. Both experimental and simulation methods were introduced to characterized TR polymers.…”

Section: Page 26 Of 76mentioning

confidence: 99%

Rigid and microporous polymers for gas separation membranes

Kim

Lee

2015

Progress in Polymer Science

Self Cite

390

130

View full text Add to dashboard Cite

Section: Page 26 Of 76mentioning

confidence: 99%

Rigid and microporous polymers for gas separation membranes

Kim

Lee

2015

Progress in Polymer Science

Self Cite

390

130

View full text Add to dashboard Cite

“…Interestingly, compared to highly permeable glassy (short dash)). Compared with reference materials; PMMA-U (-·-(black short dash dot)) [50], PTMSP-M (-··-(olive dash dot dot)) [51], tTR-450-U (-(purple solid)) [52], Indan-TB (powder) (--(orange dash)) [26]. 1 -Once CO 2 molecules are sorbed into the PI-TB matrix, there are additional ring structures which can interact with the molecules.…”

Section: Effect Of Chemical Composition On Gas Sorptionmentioning

confidence: 99%

“…polymers such as PTMSP-M[51] and tTR-450-U[52], the PI-TB films still showed higher CO 2 solubilities in the low fugacity region because the gas solubility in this region is dominated by both the C' H and b values[42].Although PTMSP-M (FFV=0.29) and tTR-450-U (FFV=0.28) have higher FFV values than PI-TB membranes, for example PI-TB-2-M (FFV=0.215) [54], the CO 2 Langmuir affinity parameters (b) of PTMSP-M and tTR-450-U were only 0.04 and 0.45 atm -1 , respectively. The b value of CO 2 for PTMSP-M is about two orders of magnitude smaller than that of PI-TB-2-M (4.3 atm -1 ).…”

mentioning

confidence: 99%

Effect of methanol treatment on gas sorption and transport behavior of intrinsically microporous polyimide membranes incorporating Tröger׳s base

Seong

Zhuang

Kim

et al. 2015

Journal of Membrane Science

Self Cite

View full text Add to dashboard Cite

“…6FDA-based polyimides have been of interest for gas separations for years, [11][12][13] and analogous structures have been pursued for TR polymers. 2,3,[14][15][16] Ether-linkages, such as those found in polysulfones and polyamides, show a higher degree of rotational freedom, 17,18 so the effect of these linkages on the thermal rearrangement reaction and transport properties were also investigated. In addition to light gas and CO 2 permeability measurements, 2 ether functionalities have also been investigated in TR polymers with dynamic mechanical analysis 19 and for aromatic/aliphatic separations.…”

Section: Introductionmentioning

confidence: 99%

Effect of polymer structure on gas transport properties of selected aromatic polyimides, polyamides and TR polymers

Smith

Hernández

Gleason

et al. 2015

Journal of Membrane Science

View full text Add to dashboard Cite

GRAPHICAL ABSTRACT HIGHLIGHTSx Several TR polymer precursors and TR polymers were synthesized.x Thermal rearrangement reactivity was investigated for each structure.x H 2 , CH 4 , N 2 , O 2 , and CO 2 permeabilities track with free volume.x CO 2 hysteresis loops were used to characterize conditioning and plasticization. x APAF-6FDA TR has above-upper bound properties for propylene/propane separation. ABSTRACTThermally rearranged (TR) polymers are formed through a thermally induced solid-state reaction of polyimides or polyamides that contain nucleophilic reactive groups ortho-positioned to their diamine. Naturally, the transport properties of TR polymers are intimately related to the chemical structure and reactivity of their precursors. Herein, we report characterization and transport properties for three poly(hydroxyimide) precursors prepared via thermal imidization in solution and for their corresponding TR polymers.Structural modifications to the polymer backbone can be used to control thermal rearrangement reaction kinetics. In regards to TR polymer formation, samples prepared from diamines with biphenyl functionality reacted more efficiently than those prepared from diamines with hexafluoroisopropylidene-linked aromatic units. However, hexafluoroisopropylidene functional units provided the highest combinations of permeability and selectivity for separations involving H 2 , N 2 , O 2 , CH 4 , and CO 2 .Differences in permeability between samples correlated well with changes in free volume, and 3 poly(hydroxyimide)s showed unusually high selectivities for their given free volume. The effect of synthesis route was also investigated for a specific TR polymer derived from 3,3'-dihydroxy-4,4'-diamino-biphenyl (HAB) and 2,2'-bis-(3,4-dicarboxyphenyl) hexafluoropropane dianhydride (6FDA). Poly(hydroxyimide) precursors prepared via thermal imidization in solution and thermal imidization in the solid-state showed nearly identical permeabilities and selectivities regardless of synthesis route. However, after thermal rearrangement, the TR polymers prepared from polyimides synthesized via solid-state imidization have higher gas permeabilities than their solutionimidized analogs. In addition to light gas permeabilities, plasticization effects were investigated with CO 2 hysteresis loops for all samples, and pure-gas olefin/paraffin permeabilities were determined for a TR polymer derived from 2,2-bis (3-amino-4-hydroxyphenyl)-hexafluoropropane (APAF) and 6FDA. With the exception of HAB-6FDA polyimides, pure-gas CO 2 feed pressures up to approximately 50 bar do not reveal a plasticization pressure point, but conditioning effects are observed for most samples.APAF-6FDA TR polymers have pure-gas permeabilities and selectivities beyond the propylene/propane upper bound.

show abstract

Sorption and transport of small gas molecules in thermally rearranged (TR) polybenzoxazole membranes based on 2,2-bis(3-amino-4-hydroxyphenyl)-hexafluoropropane (bisAPAF) and 4,4′-hexafluoroisopropylidene diphthalic anhydride (6FDA)

Cited by 65 publications

References 33 publications

Rigid and microporous polymers for gas separation membranes

Rigid and microporous polymers for gas separation membranes

Effect of methanol treatment on gas sorption and transport behavior of intrinsically microporous polyimide membranes incorporating Tröger׳s base

Effect of polymer structure on gas transport properties of selected aromatic polyimides, polyamides and TR polymers

Contact Info

Product

Resources

About