Design and Preparation of Porous Polymers

Wu, Dehai; Xu, Fei; Sun, Bin; Fu, Ruowen; He, Hongkun; Matyjaszewski, Krzysztof

doi:10.1021/cr200440z

Cited by 1,569 publications

(1,197 citation statements)

References 723 publications

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“…Three membrane sample prepared under identical conditions were analyzed and average permeability values were taken. The variation in the permeability measurement from the average was in range of 1%-11%, depending on the gas analyzed (1%-4% for He, 2%-6% for H 2 , 4%-11% for N 2 , 1%-5% for O 2 , 3%-10% for CH 4 , and 2%-7% for CO 2 ). The permeability of all gases was analyzed at 1 bar upstream pressure while keeping permeate side at ambient.…”

Section: Gas Permeability Measurementsmentioning

confidence: 98%

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Synthesis, characterization, and gas permeation properties of adamantane‐containing polymers of intrinsic microporosity

Shrimant

Shaligram

Kharul

et al. 2017

J. Polym. Sci. Part A: Polym. Chem.

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A new bis(catechol) monomer, namely, 4,4 0 -((1r,3r)-adamantane-2,2-diyl)bis(benzene-1,2diol) (THADM) was synthesized by condensation of 2-adamantanone with veratrole followed by demethylation of the formed (1r,3r)-2,2-bis(3,4 dimethoxyphenyl)adamantane. Polycondensation of THADM and various compositions of THADM and 5,5,6 0 ,6 0 -tetrahydroxy-3,3,3 0 ,3 0 -tetramethylspirobisindane was performed with 2,3,5,6-tetrafluoroterephthalonitrile (TFTPN) to obtain the homopolymer and copolymers. These polymers demonstrated good solubility in common organic solvents such as dichloromethane, chloroform, and tetrahydrofuran and could be cast into tough films from their chloroform solutions. GPC analysis revealed that number average molecular weights of polymers were in the range 48,100-61,700 g mol 21 , suggesting the formation of reasonably high molecular weight polymers. They possessed intrinsic microporosity with Brunauer-Emmett-Teller (BET) surface area in the range 703-741 m 2 g 21 . Thermogravimetric analysis of polymers indicated that 10% weight loss temperature was in the range 513-518 8C demonstrating their excellent thermal stability. THADM-based polymer of intrinsic microporosity (PIM) showed P(CO 2 ) 5 1080, P(O 2 ) 5 232 and appreciable selectivity [a(CO 2 /CH 4 ) 5 22.6, a(CO 2 /N 2 ) 5 26.7, and a(O 2 /N 2 )5 5.7]. The gas permeability measurements revealed that with increase in the content of adamantane units in PIMs, selectivity increased and permeability decreased, following the trade-off relationship. The gas separation properties of PIMs containing adamantane units were located close to 2008 Robeson upper bound for gas pairs such as CO

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Section: Gas Permeability Measurementsmentioning

confidence: 98%

“…[1][2][3][4] Polymeric materials to be used for gas separation should possess high intrinsic permeability as well as selectivity. 5 Robeson proposed the trade-off relationship between gas permeability and selectivity, wherein highly permeable polymers exhibited low selectivity and vice versa.…”

mentioning

confidence: 99%

Synthesis, characterization, and gas permeation properties of adamantane‐containing polymers of intrinsic microporosity

Shrimant

Shaligram

Kharul

et al. 2017

J. Polym. Sci. Part A: Polym. Chem.

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“…In our approach, we expanded the realm of previously utilized cross-coupling reactions of rigid and directional molecular building blocks (MBBs) 22,[33][34] into more intricate ruthenium-based, and cobaloxime-based brominated metal complexes. This new approach afforded extended porous solids containing the Ru-polypyridyl or cobaloxime functionalities as integral parts of the polymers' backbone.…”

Section: Resultsmentioning

confidence: 99%

Porous–Hybrid Polymers as Platforms for Heterogeneous Photochemical Catalysis

Haikal

Wang

Hassan

et al. 2016

ACS Appl. Mater. Interfaces

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Abstract.A number of permanently porous polymers containing Ru(bpy) n photosensitizer or a cobaloxime complex, as a protonreduction catalyst, were constructed via one-pot Sonogashira-Hagihara (SH) cross-coupling reactions. This process required minimal workup to access porous platforms with control over the apparent surface area, pore volume, and chemical functionality from suitable molecular building blocks (MBBs) containing the Ru or Co complexes, as rigid and multi-topic nodes. The cobaloxime molecular building block, generated through in situ metalation, afforded a microporous solid that demonstrated noticeable catalytic activity towards hydrogen-evolution reaction (HER) with remarkable recyclability. We further demonstrated, in two cases, the ability to affect the excited state lifetime of the covalently-immobilized Ru(bpy) 3 complex attained through deliberate utilization of the organic linkers of variable dimensions. Overall, this approach facilitates construction of tunable porous solids, with hybrid composition and pronounced chemical and physical stability, based on the well-known Ru(bpy) n or the cobaloxime complexes.

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“…Various topics regardingp orous nanocapsules have attracted growing attention in recent years,s uch as the development of methodologies to fabricate these nanostructures, their control release mechanisms, as well as their potential applications. [5] In view of the literature, the majority of the strategies reporteds of ar have involved the preparation of inorganic porousn anocapsules through multiple steps and/or harsh conditions. [6] Examples include porouss ilica nanocapsules fabricated by as urfactant-directing alkaline-etching strategy [6a] or surfactant-stabilizing TEOS condensation through the use of ad ynamic self-assembly method, [6b] porousc arbon nanocapsule monoliths fabricatedb yabiosilicification-induceds elf-assembly strategy using collagen sponges as templates, [6c] and porousC o 3 O 4 nanocapsules fabricated by calcination of CoCO 3 nanocapsule precursors as obtained by as olvothermalr oute using PVP as ac apping reagent.…”

Section: Introductionmentioning

confidence: 99%

pH‐Responsive Porous Nanocapsules for Controlled Release

Song

Wei

et al. 2017

Chemistry A European J

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In this work pH-responsive porous nanocapsules have been successfully prepared from at ernary graft copolymer,p oly(glycidyl methacrylate)-g-[poly(2-cinnamoyloxyethyl methacrylate)-r-poly(ethyleneg lycol) methyl ether-r-poly(2-diethylaminoethyl methacrylate)] or PGMA-g-(PCEMA-r-MPEG-r-PDEAEMA).T he graft copolymersw eref abricated by grafting three types of polymer chains onto the backbone polymer by using click chemistry.T hese ternary copolymers underwents elf-assembly to form vesicles in aD MF/water solvent mixture. While the MPEG chains served as the corona and stabilized the vesicles, the vesicle wall was composed of ad ominant PCEMA continuous phase that was interspersed by PDEAEMA domains. After photo-cross-linking, the PDEAEMA domains were embedded in the structurally locked PCEMA wall. By decreasing the pH of the externals olution, we were able to trigger the release of encapsulated pyrene due to the capsule wall becoming porousa saresult of the PDEAEMA chains bearing positivelyc harged amine groups stretching into the water.W hile these pH-responsive porousn anocapsulese xhibited potential applications in drug delivery,d etection and catalysis, the strategy reported in this contribution also represented an ew paradigm for the design and preparation of other novel stimuli-responsive porousnanocapsules.

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Design and Preparation of Porous Polymers

Abstract: Figure 3. Schematic illustration of fabrication of (a) individual spherical porous polymers from solid spherical nanoparticle templates, (b) tubular porous polymers from tubular porous templates, such as AAO, and (c) ordered macroporous polymers from colloidal crystal templates.

Cited by 1,569 publications

References 723 publications

Synthesis, characterization, and gas permeation properties of adamantane‐containing polymers of intrinsic microporosity

Synthesis, characterization, and gas permeation properties of adamantane‐containing polymers of intrinsic microporosity

Porous–Hybrid Polymers as Platforms for Heterogeneous Photochemical Catalysis

pH‐Responsive Porous Nanocapsules for Controlled Release

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