13 research outputs found

    Naphthalene-Based Microporous Polyimides: Adsorption Behavior of CO<sub>2</sub> and Toxic Organic Vapors and Their Separation from Other Gases

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    Naphthalene was selected as a building block to prepare three polyimide networks with different topological structures via one-pot polycondensation from naphthalene-1,4,5,8-tetracarboxylic dianhydride with tetrakis­(4-aminophenyl)­methane, tris­(4-aminophenyl)­amine, and 1,3,5-tris­(4-aminophenyl)­benzene. The resultant polymers have moderately large BET surface areas with narrow pore size distribution at around 6 Å. Interestingly, it is found that they can uptake 90.5 wt % benzene vapor (298 K, 0.8 bar), and the separation factors of benzene over nitrogen, water, and cyclohexane are as high as 759.3, 40.3, and 13.8, respectively. The high adsorption capacity and selectivity of benzene vapor are attributed to the incorporation of large amount of naphthalene groups in the network since naphthalene is highly hydrophobic in nature and has strong π-electron-delocalization effect. On the other hand, the CO<sub>2</sub> uptakes in polymers reach 12.3 wt % (273 K, 1 bar), and the adsorption curves are reversible. Moreover, the separation factors of CO<sub>2</sub>/N<sub>2</sub> and CO<sub>2</sub>/CH<sub>4</sub> are 88.6 and 12.9, respectively, superior to many other microporous organic polymers. The above experimental results were analyzed and explained with respect to the kinetic diameters, polarity, critical temperature of the vapors and gases, and the stereoconfiguration of net nodes, porous characteristics, and hydrophobic/hydrophilic nature of the pore walls of the microporous polyimides

    Facile Synthesis of Fluorinated Microporous Polyaminals for Adsorption of Carbon Dioxide and Selectivities over Nitrogen and Methane

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    Monoaldehyde compounds, benzaldehyde, 4-methyl­benzaldehyde, 4-fluoro­benzaldehyde, and 4-trifluoro­methyl­benzaldehyde, were utilized to react with melamine respectively to yield four hyper-cross-linked microporous polyaminal networks, PAN-P, PAN-MP, PAN-FP, and PAN-FMP, via a facile “one-step” polycondensation without adding any catalyst. It is found that relative to non-fluorinated polymers the fluorinated ones show the increased BET specific surface areas from 615 to 907 m<sup>2</sup> g<sup>–1</sup>. Moreover, the incorporations of methyl and trifluoromethyl on the phenyl rings can effectively tailor the pore sizes from 0.9 to 0.6 nm. The polar C–F bond and nitrogen-rich polyaminal skeleton result in high CO<sub>2</sub> adsorption enthalpies (38.7 kJ mol<sup>–1</sup>) and thereby raise the CO<sub>2</sub> uptake up to 14.6 wt % (273 K, 1 bar) as well as large CO<sub>2</sub>/N<sub>2</sub> and CO<sub>2</sub>/CH<sub>4</sub> selectivities of 78.1 and 13.4 by the ideal adsorbed solution theory, respectively. The facile and scalable preparation method, low cost, and large CO<sub>2</sub> adsorption and selectivities over N<sub>2</sub> and CH<sub>4</sub> endow the resultant microporous polyaminals with promising applications in CO<sub>2</sub>-capture from flue gas and natural gas

    Tetraphenyladamantane-Based Polyaminals for Highly Efficient Captures of CO<sub>2</sub> and Organic Vapors

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    Tetraphenyladamantane-based polyaminals with ultrasmall pore, large specific surface area and abundant CO<sub>2</sub>-philic aminal groups are successfully synthesized, which exhibit simultaneously high CO<sub>2</sub> adsorption capacity of 17.6 wt % (4.0 mmol g<sup>–1</sup>, 273 K/1.0 bar) and high adsorption selectivities of CO<sub>2</sub>/N<sub>2</sub> (104) and CO<sub>2</sub>/CH<sub>4</sub> (24). Especially, at the low pressure, e.g., 0.15 bar, the CO<sub>2</sub> uptake at 273 K can reach 8.7 wt % (1.97 mmol g<sup>–1</sup>). The adsorption/selectivity properties are superior to most of microporous organic polymers (MOPs) reported in the literature. Besides the outstanding CO<sub>2</sub>-capturing ability, the polymers also possess high uptakes of benzene and cyclohexane vapors up to 72.6 and 52.7 wt %, respectively. In addition, the effects of reaction activity and type of amino groups as well as the size and shape of building blocks on porous architecture of microporous polyaminals are studied. The disclosed results are helpful for the deep understanding of pore formation and interconnecting behavior in MOPs and therefore are of significant importance for the synthetic control of MOPs for a specific application in gas storage and capture of organic vapors

    Length distribution of the assembled (blue) and the annotated unigenes (red) of <i>P. olivaceus</i>.

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    <p>Length distribution of the assembled (blue) and the annotated unigenes (red) of <i>P. olivaceus</i>.</p

    Gene ontology (GO) annotations of the annotated unigenes.

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    <p>12,503 unigenes were assigned to three GO categories containing 52 functional subcategories.</p

    Quantitative Real-time PCR (qRT—PCR) validation of the expressed genes in transcriptome sequencing.

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    <p>IRAK4: interleukin-1 receptor-associated kinase 4; IRF7: interferon regulatory factor 7; INFAR: interferon receptor 1; NFKB1: nuclear factor NF-kappa-B p105 subunit; TRAF6: TNF receptor-associated factor 6; AKT: RAC serine/threonine-protein kinase; IRAK1: interleukin-1 receptor-associated kinase 1; F2: coagulation factorII; TNFA: tumor necrosis factor superfamily. Values are presented as means ± standard deviationn = 5and the error bars indicate the standard deviation.</p

    Venn diagram showing the comparison among <i>P. olivaceus</i> transcriptomic sequences with the known sequences from <i>D. rerio</i> and <i>P. olivaceus</i> EST deposited in the NCBI database.

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    <p>Venn diagram showing the comparison among <i>P. olivaceus</i> transcriptomic sequences with the known sequences from <i>D. rerio</i> and <i>P. olivaceus</i> EST deposited in the NCBI database.</p
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