Insights into molecular engineering of membranes based on fluorinated polyimide-polyamide miscible blends which do not obey the trade-off rule

Butnaru, Irina; Constantin, Catalin-Paul; Asăndulesa, Mihai; Wolińska‐Grabczyk, Aleksandra; Jankowski, Andrzej; Szeluga, Urszula; Damaceanu, Mariana‐Dana

doi:10.1016/j.seppur.2019.116031

Cited by 30 publications

(14 citation statements)

References 84 publications

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“…The peak positions of Co(azpy) prepared by the two methods are identical to those of the simulated Co(azpy), indicating that the crystal structure of Co(azpy) synthesized by these two methods has no significant variation in comparison with the simulated Co(azpy). The peak position is identical to the data, as reported in the literature, 46 which indicates that Co(azpy) was successfully synthesized by both hydrothermal and microwave reaction methods.…”

Section: Resultssupporting

confidence: 86%

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Light-responsive metal–organic framework sheets constructed smart membranes with tunable transport channels for efficient gas separation

et al. 2022

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Section: Resultssupporting

confidence: 86%

“…Co(azpy) exhibits the microporous structure, which is in accordance with the result (pore size ∼7.0 × 6.2 Å 2 ), as reported in the literature. 46 The adsorption isotherm of Co(azpy) for N 2 and CO 2 at 273 K is displayed in Fig. 3(b) .…”

Section: Resultsmentioning

confidence: 99%

Light-responsive metal–organic framework sheets constructed smart membranes with tunable transport channels for efficient gas separation

et al. 2022

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“…Previous work has reported that the higher the PAA amount is in PAA−PI miscible blends, the greater the optical transparency at 500 nm is, and the more the cutoff wavelength value is reduced. 41 UV−vis transmission spectra, cutoff wavelength, and transmittance at 500 nm of PAA−PI experimental films with different pre-IDs were recorded in Figure 6. Herein, the cutoff wavelength was identified as the wavelength at which the transmittance is lower than 1%.…”

Section: Resultsmentioning

confidence: 99%

Structural Evolution of Macromolecular Chain During Pre-imidization Process and Its Effects on Polyimide Film Properties

et al. 2020

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Pre-imidization has been found to have a determining role on the final properties of polyimide (PI) films. In this work, a series of 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA)/2,2′-bis(trifluoromethyl)benzidine (TFMB) PI models with specified pre-imidization degree (pre-ID) were constructed and analyzed on the basis of molecular dynamic (MD) simulation to reveal the real-time evolution of structure and properties that occurred during the pre-imidization process. The MD results indicated that the T g of the models increased obviously with increasing pre-ID, which corresponded to the increase of rigid PI chain segments that restricted the mobility of molecular chains. In addition, the increase of fractional free volume and mean square end-to-end distance indicated looser chain packing and more extended chain conformation during the pre-imidization process. As a further verification, a series of corresponding PI films were experimentally prepared via a controlled partially pre-imidization process. Mechanical properties of the prepared PI films were tested to be significantly enhanced, and the coefficient of thermal expansion decreased from 61.5 to 47.6 ppm/°C with pre-ID increasing from 0% to 100%, which could be attributed to the orderly molecular chain arrangement formed during the chemical pre-imidization process, as disclosed by MD simulation. This work paves the way for the observation of the real-time structure and property evolutions of PI materials, especially during the pre-imidization process.

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“…6. The results demonstrate that the PI lm and the HCPs/PI MMMs have broad amorphous peaks that are attributed to the presence of bulky -C(CF 3 ) 2 -groups in PI; thus, the PI lm and HCPs/PI MMMs have loose chain packing [53].…”

Section: Analysis Of Gas Separation Processmentioning

confidence: 92%

A Facilitated Gas Transport Strategy: 3D Porous Hyper-crosslinked Polymers Incorporating 6FDA-based Polyimide Matrix for the Design and Fabrication of Mixed Matrix Membranes with High Permeability

Chen

Peng

et al. 2021

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Economic membrane technologies are a perennial hot topic in the field of natural gas purification and O2 enrichment. In this work, novel hyper cross-linked polymers (HCPs) incorporating 6-FDA based polyimide (PI) MMMs were prepared via a casting method for enhancing different gas transport (CO2, CH4, O2, and N2). The gas permeation experiments showed that compared with pure PI films, adding HCPs effectively promotes gas transport, increases gas permeability, and maintains ideal selectivity. The permeability of HCPs/PI MMMs toward CO2 and O2 was as high as 105.85 barrer and 24.03 barrer, respectively, and the ideal selectivity of CO2/CH4 and O2/N2 was 15.67 and 3.00, respectively. Molecular dynamic simulations further verified that adding HCPs was beneficial to gas transport thanks to large FFV of MMMs. Thus, HCPs have potential utility in the fabrication of MMMs for facilitating gas transport in the field of natural gas purification and O2 enrichment.

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Insights into molecular engineering of membranes based on fluorinated polyimide-polyamide miscible blends which do not obey the trade-off rule

Cited by 30 publications

References 84 publications

Light-responsive metal–organic framework sheets constructed smart membranes with tunable transport channels for efficient gas separation

Light-responsive metal–organic framework sheets constructed smart membranes with tunable transport channels for efficient gas separation

Structural Evolution of Macromolecular Chain During Pre-imidization Process and Its Effects on Polyimide Film Properties

A Facilitated Gas Transport Strategy: 3D Porous Hyper-crosslinked Polymers Incorporating 6FDA-based Polyimide Matrix for the Design and Fabrication of Mixed Matrix Membranes with High Permeability

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