Microphase-separated, hierarchical macroporous polyurethane from a nonaqueous emulsion-templated reactive block copolymer

Gui, Haoguan; Guan, Guangwu; Zhang, Tao; Guo, Qipeng

doi:10.1016/j.cej.2019.02.015

Cited by 38 publications

(28 citation statements)

References 53 publications

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“…Besides the above mentioned separation applications, polyHIPEs have been applied for separation of particulate matters [76, 156], Enterovirus 71 [157], microalgae [100], anions [99, 146, 158, 159], and adsorption of water and other solvents [70, 160–162]. Triplicate injections of 5 and 10 nm gold particles injected onto a STY/DVB polyHIPE column produced an average difference in retention time of 135 s, and triplicate injections of 52 and 155 nm dysprosium‐doped PS latex particles produced a difference in retention time of 8 s, indicating the potential of polyHIPEs for separation of nanoparticles [76].…”

Section: Separation Applicationsmentioning

confidence: 99%

“…Bis‐vinylimidazolium‐type polyHIPE resins exhibited strong affinity toward and high ion‐exchange ability for inorganic anions (F − , Br − , Cl − , NO 3 − , SO 4 2− , Mo 7 O 24 6− , and PO 4 3− ) and organic anions (malate, citrate, malonate, tartate, lactate, and oxalate), which depended strongly on the hydrophilic character of polyHIPEs and the pH of the solution, and they possessed good selectivity for sulphate and oxalate anions and high sorption capacity for fluoride anion (4.35 mmol/g) and oxalate anion (3.73 mmol/g), respectively [159]. In addition, Zhang et al [160–162] designed a series of highly porous polyHIPE hydrogels to adsorb water from various sample solutions, and found the water uptake was up to 208.7 g/g under the optimized experimental conditions.…”

Section: Separation Applicationsmentioning

confidence: 99%

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Recent advances in separation applications of polymerized high internal phase emulsions

Luo

Huang

Liu

et al. 2020

J of Separation Science

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Polymerized high internal phase emulsions as highly porous adsorption materials have received increasing attention and wide applications in separation science in recent years due to their remarkable merits such as highly interconnected porosity, high permeability, good thermal and chemical stability, and tailorable chemistry. In this review, we attempt to introduce some strategies to utilize polymerized high internal phase emulsions for separation science, and highlight the recent advances made in the applications of polymerized high internal phase emulsions for diverse separation of small organic molecules, carbon dioxide, metal ions, proteins, and other interesting targets. Potential challenges and future perspectives for polymerized high internal phase emulsion research in the field of separation science are also speculated at the end of this review.

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Section: Separation Applicationsmentioning

confidence: 99%

Section: Separation Applicationsmentioning

confidence: 99%

Recent advances in separation applications of polymerized high internal phase emulsions

Luo

Huang

Liu

et al. 2020

J of Separation Science

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“…Several methods to prepare porous materials have been developed over time 16 . Invented by Unilever in 1982, 17 polymerized high internal phase emulsion (polyHIPE) is nowadays receiving particular attention, and is being exploited in various applications, for example as selective absorbers, 18–20 chromatographic columns 21,22 or heterogeneous catalysts 23,24 . PolyHIPE materials offer very facile scalable preparation, good flow‐through properties and low pressure drop as a consequence of their porous structure, large specific surface area, as well as easy surface chemistry modifications 25 .…”

Section: Introductionmentioning

confidence: 99%

Monolithic flow reactor for enzymatic oxidations

Zverina

Pinelo

Woodley

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND Oxidation is among the most important reactions in organic chemistry. Enzymatic oxidation offers a greener alternative to a conventional chemo‐catalytic approach and opens the potential for new reactions. However, inefficient use of expensive enzymes and oxygen (O2) limitations represent particular challenges for biocatalytic reactor design. This work reports a new tubular reactor for continuous flow enzymatic oxidations. RESULTS The reactor comprises a thiol‐functional porous monolith (0.93 ± 0.16 m2 g−1) and an O2‐permeable wall (115 600 ± 1500 mL m−2 day−1). The monolith retains enzyme inside the reactor leading to efficient use. The wall acts as a membrane contactor providing transport of O2 from atmospheric air to the immediate proximity of the enzyme inside the reactor, without any pressure and sparging required. The reactor performance was demonstrated using oxidation of glucose by glucose oxidase (EC 1.1.3.4) coupled with in situ consumption of hydrogen peroxide by horseradish peroxidase (EC 1.11.1.7). At a constant flow rate of 0.1 mL min−1, the product concentration reached 0.10 mmol L−1 after 1.5 h and continued to be relatively high for the next ≥10 h. Overall, the reactor remained active for >40 h using only 15 μg glucose oxidase. Furthermore, the reactor could be rejuvenated by periodic injection of fresh enzyme and thus can operate continuously for extended periods. CONCLUSION We have shown here an alternative approach to efficient enzyme use and O2 delivery. Moreover, with its flexible design, the reactor can be optimized to accommodate a range of gas‐dependent biocatalytic transformations. © 2021 Society of Chemical Industry (SCI).

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“…However, the surface of a typical polyHIPE is typically dictated by small surfactants, which are readily eroded away. A more permanent monolayer functional surface can be obtained when an amphiphilic block copolymer is used in place of a small surfactant [38][39][40][41]. The drawbacks of diblock copolymer macrosurfactants include high viscosity and/or a strong tendency to aggregate in the monomer phase of a HIPE.…”

Section: Introductionmentioning

confidence: 99%

Dendritic Macrosurfactant Assembly for Physical Functionalization of HIPE-Templated Polymers

Weng

Jin

et al. 2020

Polymers

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High-internal-phase emulsion-templated macroporous polymers (polyHIPEs) have attracted much interest, but their surface functionalization remains a primary concern. Thus, competitive surface functionalization via physical self-assembly of macrosurfactants was reviewed. Dendritic and diblock-copolymer macrosurfactants were tested, and the former appeared to be more topologically competitive in terms of solubility, viscosity, and versatility. In particular, hyperbranched polyethyleneimine (PEI) was transformed into dendritic PEI macrosurfactants through click-like N-alkylation with epoxy compounds. Free-standing PEI macrosurfactants were used as molecular nanocapsules for charge-selective guest encapsulation and robustly dictated the surface of a macroporous polymer through the HIPE technique, in which the macroporous polymer could act as a well-recoverable adsorbent. Metal nanoparticle-loaded PEI macrosurfactants could similarly lead to polyHIPE, whose surface was dictated by its catalytic component. Unlike conventional Pickering stabilizer, PEI macrosurfactant-based metal nanocomposite resulted in open-cellular polyHIPE, rendering the catalytic sites well accessible. The active amino groups on the polyHIPE could also be transformed into functional groups of aminopolycarboxylic acids, which could efficiently eliminate trace and heavy metal species in water.

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Microphase-separated, hierarchical macroporous polyurethane from a nonaqueous emulsion-templated reactive block copolymer

Cited by 38 publications

References 53 publications

Recent advances in separation applications of polymerized high internal phase emulsions

Recent advances in separation applications of polymerized high internal phase emulsions

Monolithic flow reactor for enzymatic oxidations

Dendritic Macrosurfactant Assembly for Physical Functionalization of HIPE-Templated Polymers

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