Molecularly Engineered 6FDA‐Based Polyimide Membranes for Sour Natural Gas Separation

Liu, Zhongyun; Liu, Yang; Qiu, Wulin; Koros, William J.

doi:10.1002/ange.202003910

Cited by 6 publications

(4 citation statements)

References 40 publications

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“…This behavior is similar to that of glassy polymers and originates from large differences in the diffusion rates for molecules of slightly different sizes and shapes. [45,46] In essence, for slightly larger molecules, the jump rate between bordering open spaces in a rigid glassy polymer decreases strongly. For polyphosphazene polymers, it has been demonstrated that the T g can be affected by introducing different substitution groups.…”

Section: Resultsmentioning

confidence: 99%

Thin‐Film Composite Cyclomatrix Poly(Phenoxy)Phosphazenes Membranes for Hot Hydrogen Separation

Radmanesh

Sudhölter

Tena

et al. 2022

Adv Materials Inter

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An interfacial polymerization process is introduced for the fabrication of thermally stable cyclomatrix poly(phenoxy)phosphazenes thin‐film composite membranes that can sieve hydrogen from hot gas mixtures. By replacing the conventionally used aqueous phase with dimethyl sulfoxide/potassium hydroxide, a variety of biphenol molecules are deprotonated to aryloxide anions that react with hexachlorocyclotriphosphazene dissolved in cyclohexane to form a thin film of a highly cross‐linked polymer film. The film membranes have persistent permselectivities for hydrogen over nitrogen (16–27) and methane (14–30) while maintaining hydrogen permeances in the order of (10−8–10−7 mol m−2s−1Pa−1) at temperatures as high as 260 °C and do not lose their performance after exposure to 450 °C. The unprecedented thermal stability of these polymer membranes opens the potential for industrial membrane gas separations at elevated temperatures.

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Section: Resultsmentioning

confidence: 99%

Thin‐Film Composite Cyclomatrix Poly(Phenoxy)Phosphazenes Membranes for Hot Hydrogen Separation

Radmanesh

Sudhölter

Tena

et al. 2022

Adv Materials Inter

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“…Polymeric materials designed for use in membrane-based natural gas purification application are numerous nowadays in the literature, though not all aspects have been entirely covered in this area. Several polymeric classes have been studied for membrane-based gas separation applications, such as polysulfone, , poly( p -phenylene oxide), − cellulose acetate, , polymers with intrinsic microporosity (PIM), polyimides, , polyazoles (polyoxadiazoles and polytriazoles), , and so on.…”

Section: Introductionmentioning

confidence: 99%

Molecular Design of Poly(imide–oxadiazole) Membranes for High-Pressure Mixed-Gas Separation

et al. 2022

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The design of new polymeric materials and the search for new classes of polymers for industrial application in membrane-based gas separation have been the focus of several research groups worldwide. Membranes with high productivity and efficiency under harsh operational conditions of pressure and temperature during mixed-gas separation are of great interest. In this paper, we report the preparation of a series of block copolymers of poly(imide−oxadiazole)s built from 6FDA, Durene, and four different 1,3,4-oxadiazole-based monomers. The pureand mixed-gas separation properties of their corresponding membranes were measured. The mixed-gas separation data were collected at a high feed pressure of up to 900 psi. Such mixed-gas separation testing under harsh conditions is required to subject the membranes to environments similar to industrial use. For example, the mixed-gas CO 2 permeability of 6FDA-Durene/6FDA-4BAO(Me) (3:1) was measured at 900 psi to be ∼130 barrer, and the CO 2 /CH 4 selectivity is around ∼24. These results of permeability and selectivity of poly(imide−oxadiazole) membranes at such high gas feed pressure are considered very attractive and are superior to many glassy polymers reported in the literature and that are industrially observed membranes. This work illustrates well a case scenario of structure−property relationship and demonstrates the exclusivity of mixed-gas testing which could not be predicted from the ideal situation of pure-gas testing. In the near future, the mixed-gas separation properties of thin layer composite and hollow fibers will be evaluated.

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“…In order to minimize signal transmission crosstalk, interconnection resistance-capacitance delay in communication, the dielectric constant and dielectric loss of the dielectric need to be reduced as much as possible. 3 As a common engineering plastic, polyimide (PI) is widely used in gas separation, [4][5][6] electromagnetic shielding and absorbing, 7,8 and thermal conductivity materials [9][10][11] due to its excellent mechanical properties and corrosion resistance. However, since the dielectric constant of polyimides is around 3.2, which is not suitable for the current low dielectric constant requirement, plenty of methods are used to modify polyimides to make its dielectric constant meet the low dielectric constant requirement (k < 3.0).…”

Section: Introductionmentioning

confidence: 99%

Crosslinked polyimides with bulky side-group polyhedral silsesquioxanes: Towards lower dielectric constant and better mechanical property

Wang,

Song,

Zheng

et al. 2023

High Performance Polymers

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The synthesis of a low dielectric constant polyimide (PI) with a polyhedral oligomeric silsesquioxane (POSS) cross-linked structure is presented. A non-planar conjugated diamine monomer (FSNH2) with two -CH=CH2 reactive groups was first synthesised in a two-step process, and then two polyimides were synthesized by PSS-Octavinyl (OVPOSS) substituted, FSNH2 and dianhydride. OVPOSS cross-linked polyimides have good thermal stability and low dielectric constant. 6FDA-FSNH2-OVPOSS(6FPI-3) can reach a minimum dielectric constant of 2.08 (108 Hz) and a dielectric loss of 0.008 (108 Hz). In addition, the cross-linked structure of the OVPOSS and polyimide chains prevents the agglomeration of OVPOSS to a certain extent and improves the tensile strength and elongation at break of the polyimides, which has great application potential in large-scale integrated circuits.

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Molecularly Engineered 6FDA‐Based Polyimide Membranes for Sour Natural Gas Separation

Cited by 6 publications

References 40 publications

Thin‐Film Composite Cyclomatrix Poly(Phenoxy)Phosphazenes Membranes for Hot Hydrogen Separation

Thin‐Film Composite Cyclomatrix Poly(Phenoxy)Phosphazenes Membranes for Hot Hydrogen Separation

Molecular Design of Poly(imide–oxadiazole) Membranes for High-Pressure Mixed-Gas Separation

Crosslinked polyimides with bulky side-group polyhedral silsesquioxanes: Towards lower dielectric constant and better mechanical property

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