Effect of thermal processing on brominated 6FDA-DAM for effective propylene/propane separation

Huy, Xuan; Nguyen, Que Thi; Kim, Se-Jin; Lee, Albert S.; Baek, Kyung‐Youl

doi:10.1016/j.seppur.2021.118331

Cited by 10 publications

(5 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The molecular structure of hyper‐coPIs was investigated using FT‐IR. As shown in Figure 3A, the in‐plane and out‐of‐plane bending of CNC at 1363/cm and 723/cm and the stretching vibration of CO at 1783 and 1722/cm could be clearly observed 37–39 . It confirms that imidization has been successfully promoted in all the membranes.…”

Section: Resultssupporting

confidence: 53%

“…As shown in Figure 3A, the in-plane and out-of-plane bending of C N C at 1363/cm and 723/cm and the stretching vibration of C O at 1783 and 1722/cm could be clearly observed. [37][38][39] It confirms that imidization has been successfully promoted in all the membranes. The aromatic C C stretching at both 1668/cm is from the benzene rings.…”

Section: Characterization Of Membranessupporting

confidence: 62%

See 1 more Smart Citation

Tuning the fraction free volume of hyperbranched 6FDA/TAPA polyimide membrane via DAM for enhanced gas separation performance

Liu,

Wang,

Liu

et al. 2023

Polymers for Advanced Techs

View full text Add to dashboard Cite

An effective strategy to optimize the gas separation performance of hyperbranched polyimide (hyper‐PI) membranes by tuning their average cavity sizes is reported. Triphenylamine (TAPA) and 4,4′‐(Hexafluoroisopropylidene) diphthalic anhydride (6FDA) were used to prepare the hyper‐PI membrane, and the transformation in free fraction volume (FFV) was realized by the addition of an extra B2‐type monomer, 2,4,6‐Trimethylbenzene‐1,3‐diamine (DAM). In hyperbranched networks, DAM, in conjunction with 6FDA, generates longer linear parts and reduces the density of dendritic architectures formed by TAPA. The conformational freedom of hyperbranched TAPA‐6FDA is restricted, and chain packing is hindered. The ratio of DAM:TAPA predominantly influences both the average cavity sizes and the FFVs of the membranes, leading to the variation in gas permeabilities. DAM5:TAPA1‐6FDA shows the best performance in both O2/N2 and CO2/N2 separations.

show abstract

Section: Resultssupporting

confidence: 53%

Section: Characterization Of Membranessupporting

confidence: 62%

Tuning the fraction free volume of hyperbranched 6FDA/TAPA polyimide membrane via DAM for enhanced gas separation performance

Liu,

Wang,

Liu

et al. 2023

Polymers for Advanced Techs

View full text Add to dashboard Cite

show abstract

“…This indicated that the resultant product included a mixture of different substitutions of BrPI- x depending on the number and location of the brominated group. As the degree of bromination increased, the integrated peak area of benzylic protons ( H a ) at 2.00 and 2.23 ppm decreased, whereas the integrated peak area of –CH 2 –Br– ( H e ) at 4.18 and 4.37 ppm increased. , The degree of bromination of BrPI-1 was approximately 7.78% from NMR analysis. The 1 H NMR spectra and TGA curves of BrPI- x (1–4) with controlled degrees of bromination are shown in Figures S7 and S8 with a detailed explanation.…”

Section: Resultsmentioning

confidence: 91%

“…Brominated 6FDA-DAM (called 6FDA-DAM-Br hereinafter) was synthesized using a slightly version of a method reported in the literature. , 6FDA-DAM (1.0 g) and NBS (0.16 g) were dissolved in chloroform (60 mL) in a round-bottom flask. After the reactants dissolved fully, AIBN (0.002 g) was added as an initiator with vigorous stirring.…”

Section: Experimental Sectionmentioning

confidence: 99%

Ionic Cross-Linked MOF-Polymer Mixed-Matrix Membranes for Suppressing Interfacial Defects and Plasticization Behavior

Jo,

Kim,

et al. 2024

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

To address the plasticization phenomenon and MOF-polymer interfacial defects, we report the synthesis of ionic cross-linked MOF MMMs from a dual brominated polymer and MOF components by using N,N′-dimethylpiperazine as the crosslinker. We synthesized brominated MIL-101(Cr) nanoparticles by using mixed linkers and prepared brominated polyimide (6FDA-DAM-Br) to form ionic cross-linked MMMs. The gas permeation properties of the polyimide, ionic cross-linked MOF-polymer MMMs, and non-cross-linked MOF-polymer MMMs with various MOF weight loadings were investigated systematically to effectively understand the effects of MOF weight loading and ionic crosslinking. The ionic cross-linked 40 wt % MOF-polymer MMM exhibited significantly enhanced gas permeability with an H 2 permeability of 1640 Barrer and CO 2 permeability of 1981 Barrer and slightly decreased H 2 /CH 4 , H 2 /N 2 , CO 2 /CH 4 and CO 2 / N 2 selectivities of 16.9, 15.4, 20.5, and 18.6, respectively. The H 2 and CO 2 permeabilities are approximately 2−3 fold higher than those of the pure polyimide (6FDA-DAM) membrane. Moreover, the ionic cross-linked 40 wt % MOF-polymer MMM exhibited significantly increased resistance to plasticization. This is because the brominated MOF incorporation boosted molecular transport and polymer chain rigidity, and ionic cross-linking further reduced the number of interfacial defects and polymer chain mobility.

show abstract

“…[1][2][3][4][5][6] Membrane-based separation is an attractive alternative for many molecular separations due to its energy-saving and highly efficient advantages. 4,[7][8][9][10] At present, polymer membranes are widely used in industry, [11][12][13][14][15] but they also encounter the problem of plasticization and the bottleneck of a tradeoff between selectivity and permeability. [16][17][18] Therefore, promising membrane materials with excellent performance are always desired in membrane separation technology.…”

Section: Introductionmentioning

confidence: 99%

Fast‐current‐driven synthesis of ultrathin ZIF‐8 membrane on ceramic tube for propene/propane separation

et al. 2022

View full text Add to dashboard Cite

MOF membranes are very promising in molecular separation, but it is still a challenge for industrial applications due to the complex and time-consuming synthesis. We use the fast current-driven synthesis (FCDS) method to achieve controlled growth of ZIF-8 membranes on porous graphite-coated ceramic tubes by controlling the growth time and current density. Grown for 30 min at a current density of 0.74 mA/cm 2 , the

show abstract

Effect of thermal processing on brominated 6FDA-DAM for effective propylene/propane separation

Cited by 10 publications

References 29 publications

Tuning the fraction free volume of hyperbranched 6FDA/TAPA polyimide membrane via DAM for enhanced gas separation performance

Tuning the fraction free volume of hyperbranched 6FDA/TAPA polyimide membrane via DAM for enhanced gas separation performance

Ionic Cross-Linked MOF-Polymer Mixed-Matrix Membranes for Suppressing Interfacial Defects and Plasticization Behavior

Fast‐current‐driven synthesis of ultrathin ZIF‐8 membrane on ceramic tube for propene/propane separation

Contact Info

Product

Resources

About