Synthesis and Characterization of Porous Benzimidazole-Linked Polymers and Their Performance in Small Gas Storage and Selective Uptake

Rabbani, Mohammad Gulam; El‐Kaderi, Hani M.

doi:10.1021/cm300407h

Cited by 429 publications

(450 citation statements)

References 71 publications

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“…P-1 still exhibits higher selectivity than P-2 despite its much smaller CO 2 uptake compared to P-2. A similar observation can be made for the PECONF series, 59 the BILP series 44 and a series of aniline hypercrosslinked copolymers. 60 There is oen a trade-off between absolute uptake and selectivity, and the polymers reported above with the highest CO 2 uptake showed lower selectivity than materials with lower uptakes in this series.…”

supporting

confidence: 77%

Design and synthesis of novel carbazole–spacer–carbazole type conjugated microporous networks for gas storage and separation

Qiao

Yang

2014

J. Mater. Chem. A

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Two novel conjugated microporous networks, P-1 and P-2, with carbazole-spacer-carbazole topological model structures, were designed and prepared by FeCl 3 oxidative coupling polymerization. Monomer m-1 (fluorenone spacer) was modified with a thiophene Grignard to form the fluorenyl tertiary alcohol monomer m-2, and this step can increase the polymerization branches from four to five and incorporate the polar -OH group into the building block. N 2 adsorption isotherms show that, after modification, the Brunauer-Emmett-Teller (BET) surface area of P-2 (1222 m 2 g À1) is two times that of P-1 (611 m 2 gand the total pore volume increases 1.63 times from 0.95 to 1.55 at P/P 0 ¼ 0.99. However, the domain pore size (centred at 1.19 nm) and the pore distribution of both networks are not changed. It demonstrates that the domain pore width may be determined by the size of the rigid carbazole-spacercarbazole backbone, not the degree of crosslinking when the networks were prepared under same polymerization conditions in this system. Hydrogen physisorption isotherms of P-1 and P-2 show that the H 2 storage can be up to 1.05 wt% and 1.66 wt% at 77 K and 1.1 bar, and the isosteric heat is 9.89 kJ mol À1 and 10.86 kJ mol À1 , respectively. At 273 K and 1.1 bar, the CO 2 uptake capacity of P-2 can be up to 14.5 wt% which is 1.63 times that of P-1 under the same conditions. The H 2 and CO 2 uptake capacities of P-2 are among the highest reported for conjugated microporous networks under similar conditions. The CO 2 /CH 4 and CO 2 /N 2 selectivity results indicate that P-1 exhibits a slightly higher separation ability than P-2. There is often a trade-off between absolute uptake and selectivity in other microporous organic polymers. Fine design and tailoring the topological structure of the monomer can change the adsorption isosteric enthalpy and optimize the gas uptake performance. The obtained networks with the carbazole-spacer-carbazole rigid backbone show promise for potential use in clean energy applications and the environmental field.

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supporting

confidence: 77%

Design and synthesis of novel carbazole–spacer–carbazole type conjugated microporous networks for gas storage and separation

Qiao

Yang

2014

J. Mater. Chem. A

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“…comparable to the highest reported pore materials, such as APOP-1-F (43.4 at 273 K) [32], BILP-2 (71 at 298 K) [27] and O-TTPP (50.7, 273K) [12a].…”

Section: Selectivity Of Co 2 /Ch 4 and Co 2 /Nsupporting

confidence: 76%

“…) [25], BILP-10 (38.2 kJ mol À1 ) [26], PECONF-4 (34 kJ mol À1 ) [27], and acidfunctionalized CMP-1-COOH (32.6 kJ mol…”

mentioning

confidence: 99%

Fine tailoring the steric configuration of initial building blocks to construct ultramicroporous polycarbazole networks with high CO2 uptake and selectivity of CO2 over N2

Qiao

Huang

Wei

et al. 2015

Polymer

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a b s t r a c tThree carbazole based building blocks with similar propeller-like steric configuration are designed and synthesized. The polycarbazole networks P-4, 4 0 -biscarbazolyl-phenyl (P-BCz), P-tetracarbazolyl-pdifluorobenzene (P-TCz) and P-hexacarbazolyl-phenyl (P-HCz) are obtained with high surface areas and uniform ultramicropores. The aggregation morphologies of networks vary from regular spherical particles, ribbon-like structure to large lamellar structure as the number of carbazole increased around the benzene ring. The networks P-TCz, with four carbazole decorating on the benzene ring, have the largest surface area and highest gas uptake ability among the three networks. However, the CO 2 and CH 4 isosteric enthalpies increased linearly with increasing the number of carbazole. The networks P-HCz with six carbazole show the excellent CO 2 /N 2 separative capacity (107 at 273 K, and 127 at 298 K), which is among the highest reported about CO 2 separation using organic pore networks. Fine designing and tailoring the topological structure of monomer can control the adsorption properties and optimize the gas uptake performance.

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“…BILPs exhibited outstanding chemical and thermal properties and excellent CO 2 and H 2 uptakes with high CO 2 /N 2 and CO 2 /CH 4 selectivities. 127 Therefore, it is considered as the most suitable additives for CO 2 separation MMMs. Ali et al incorporated BILP in PIM-1 MMMs and observed significant improvement in permeability of CO 2 with slight decrease in CO 2 /N 2 selectivity up to 30 wt.% loading.…”

Section: Carbon-based MMMmentioning

confidence: 99%

Mixed Matrix Membranes for Gas Separation Applications

Carreon¹,

Dahe²,

Feng³

et al. 2017

Membranes for Gas Separations

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Mixed matrix membranes (MMMs) have gained lot of interest in the research community over the last few years in order to overcome the performance trade-off shown by the polymeric membranes. An MMM utilizes the benefits of both polymeric and inorganic materials and has the potential to show very high performance without much increase in the cost of fabrication. But the fabrication of an MMM without conceding the mechanical properties is very challenging. In this chapter, the materials selection and fabrication techniques of MMM in both flat sheet and hollow fiber configurations are discussed. Formation of defects at the interface is one of the biggest challenges in fabricating the MMM. Different techniques used in the literature to compatibilize the polymer and particle were summarized. In addition, the recent progress of MMM for gas separation applications and performance prediction models were provided in detail.

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Synthesis and Characterization of Porous Benzimidazole-Linked Polymers and Their Performance in Small Gas Storage and Selective Uptake

Cited by 429 publications

References 71 publications

Design and synthesis of novel carbazole–spacer–carbazole type conjugated microporous networks for gas storage and separation

Design and synthesis of novel carbazole–spacer–carbazole type conjugated microporous networks for gas storage and separation

Fine tailoring the steric configuration of initial building blocks to construct ultramicroporous polycarbazole networks with high CO2 uptake and selectivity of CO2 over N2

Mixed Matrix Membranes for Gas Separation Applications

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