Preparation and gas transport properties of thermally induced rigid membranes of copolyimide containing cardo moieties

Lu, Yunhua; Hao, Jican; Li, Lin; Song, Jing; Xiao, Guoyong; Zhao, Hongbin; Hu, Zhizhi; Wang, Tonghua

doi:10.1016/j.reactfunctpolym.2017.08.013

Cited by 37 publications

(20 citation statements)

References 40 publications

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“…Here, we can clearly distinguish the thermally rearranged (TR) polymer membranes from CMSMs based on PXRD patterns. The diffraction peak of the TR polymer membrane shifted to the lower diffraction angle (Figure S3), corresponding to an increase in average inter‐chain d ‐spacing as a result of the increment of free‐volume void interconnection under heat treatment . With deep pyrolysis, the typical vibration peaks of the imide groups of P84 at approximate 1,780, 1,720, 1,370, and 1,100 cm −1 , corresponding to the asymmetric and symmetric stretching mode of CO, the stretching mode of CNC and the stretching mode of CN, weakened gradually and disappeared upon carbonization temperature reaching above 600°C, as proved by ATR‐FTIR spectra in Figure h.…”

Section: Resultsmentioning

confidence: 99%

Carbon molecular sieving membranes for butane isomer separation

et al. 2019

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Membrane-based separations of hydrocarbon isomers are major challenges for the petrochemical industry. Herein, high quality carbon molecular sieving membranes (CMSMs) were prepared on γ-alumina substrates from pyrolysis of P84 polymer membranes. Targeting at butane isomer separations, we tailored the slit-like ultramicropores of CMSMs at angstrom level by rational manipulations of the pyrolysis temperature. The crack-free CMSMs were obtained at 600 C with the narrow and uniform ultramicropores centered at 6.0 Å. A clear molecular size/shape discrimination was achieved successfully and remarkable n-butane permeance (384 GPU) and n-butane/iso-butane separation factor (74) was observed, which transcends the upper limit of well-intergrown crystalline zeolite membranes. Fine-tuning of the membrane thickness at sub-micron level, the n-butane permeance and n-butane/ iso-butane separation factor were further optimized, which shows a great potential for petrochemical separation.

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Section: Resultsmentioning

confidence: 99%

Carbon molecular sieving membranes for butane isomer separation

et al. 2019

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“…As reported, 9,9-bis(3-amino-4-hydroxyphenyl)uorene (bisAHPF) is a kind of diamine with rigid and bulky uorenyl cardo group, which has been used as the hydroxy-functional diamine to prepare the TR polymers. [37][38][39] Cardo moiety with loop shaped structure in polymer main chains is useful to improve the FFV and gas permeabilities of polymeric membranes. [40][41][42][43][44] Additionally, uorenyl cardo group has a large steric hindrance, which is benecial to restrict the tight stacking of macromolecular chains and increase chain rigidity, thermal properties and FFV.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and gas permeation properties of thermally rearranged poly(ether-benzoxazole)s with low rearrangement temperatures

Zhang

Xiao

et al. 2020

RSC Adv.

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“…A typical example of this approach is polyimide because of its flexible chemical structure. Recently, hundreds of polyimides with different diamine or dianhydride moieties were synthesized and studied . Polyimide is one of the most promising membrane materials for natural gas and biogas separation due to its excellent properties, such as high gas permselectivity, high thermal and chemical resistance, and excellent mechanical properties …”

Section: Introductionmentioning

confidence: 99%

Preparation and Gas Separation Properties of Triptycene‐Based Microporous Polyimide

Zhang

Weng

2019

Macro Chemistry & Physics

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Polyimides with intrinsic microporosity (PIM‐PIs) are widely regarded as one of the most promising next‐generation membrane materials to simultaneously achieve high permeability and selectivity. Despite the fact that tremendous microporous polyimides have been synthesized, only cost‐efﬁcient PIM‐PIs have the potential to be used in industrial applications. In this work, a PIM‐PI is prepared by using the commercial and inexpensive planar pyromellitic dianhydride (PMDA) as the dianhydride monomer, and 2,6‐diaminotriptycene as the diamine monomer. The CO2 permeability of PMDA‐DAT is ≈23‐fold higher than that of Kapton, one of the commercially available polyimide membranes also made from PMDA, and with almost the same CO2/CH4 selectivity. In addition, no plasticization phenomenon is observed for PMDA‐DAT membrane even at a CO2 pressure up to 15 atm. The good plasticization resistance performance of PMDA‐DAT can be mainly attributed to the formation of pseudo‐physical crosslinking by interlocking and π–π interactions in triptycene moieties.

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Preparation and gas transport properties of thermally induced rigid membranes of copolyimide containing cardo moieties

Cited by 37 publications

References 40 publications

Carbon molecular sieving membranes for butane isomer separation

Carbon molecular sieving membranes for butane isomer separation

Synthesis and gas permeation properties of thermally rearranged poly(ether-benzoxazole)s with low rearrangement temperatures

Preparation and Gas Separation Properties of Triptycene‐Based Microporous Polyimide

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