Poly(<scp><i>N</i></scp>‐isopropylacrylamide) gel‐based macroporous monolith for continuous‐flow recovery of palladium(<scp>II</scp>) ions

Seto, Hirokazu; Matsumoto, Hikaru; Shibuya, Makoto; Akiyoshi, Takanori; Hoshino, Yu; Miura, Yoshiko

doi:10.1002/app.44385

Cited by 11 publications

(8 citation statements)

References 24 publications

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“…Thermoresponsive polymers are regarded as promising materials for applications such as drug delivery , and the collection of chemicals in solutions. , Currently, one of the best-known thermoresponsive polymers is poly-( N -isopropyl acrylamide) (PNIPAM), which has attracted much interest because of the fact that its phase transition occurs at near-ambient temperature. PNIPAM has been utilized for various applications, such as the collection of precious metals and waste chemicals . Notably, it has also been utilized as a separation material in chromatographic procedures .…”

Section: Introductionmentioning

confidence: 99%

Aggregation-Induced Expansion of Poly-(N-isopropyl acrylamide) Solutions Observed Directly by the Transient Grating Imaging Technique

2018

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The anomalous volume expansion of poly-( N -isopropyl acrylamide) (PNIPAM) solutions was observed during the thermally induced polymer phase transition of aqueous solutions having concentrations in the 3–7 wt % range. The process occurred on a millisecond time scale, and a laser temperature-jump time-resolved technique was used to bring about the process. After heating a solution with a pulse laser exploiting light absorption by dyes added to the solution itself, a phase transition was observed to take place, and the temporal changes associated with it were visualized through the transient grating imaging technique, whereby the solution was heated with a stripe pattern. We found several processes occurring on a millisecond time scale, all of which clearly took place after each PNIPAM molecule had collapsed structurally from a coiled to a globular conformation. During the so-called demixing process, the globular polymers aggregated with each other within 10 ms, and suddenly the polymer phase expanded as aggregation progressed further. After this process, the individual globular polymers reverted to their coiled conformation via hydration during the remixing process. We proposed that solution expansion was caused by the mutual entangling of multiple globular PNIPAM molecules, instead each globule polymer was separated.

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Section: Introductionmentioning

confidence: 99%

Aggregation-Induced Expansion of Poly-(N-isopropyl acrylamide) Solutions Observed Directly by the Transient Grating Imaging Technique

2018

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“…Various types of porous polymers have been prepared by polymerization-induced phase separation (vinyl type monomers [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 ], click type polymerizations such as epoxy-amine reaction [ 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ], epoxy-thiol reaction [ 35 , 36 , 37 ], thiol-ene/yene [ 38 , 39 , 40 , 41 , 42 , 43 , 44 ], thiol-(meth) acrylate [ 45 , 46 , 47 ]) and temperature induced phase transfer [ 48 , 49 , 50 , 51 , 52 , 53 , …”

Section: Introductionmentioning

confidence: 99%

Morphology Control and Metallization of Porous Polymers Synthesized by Michael Addition Reactions of a Multi-Functional Acrylamide with a Diamine

et al. 2021

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Porous polymers have been synthesized by an aza-Michael addition reaction of a multi-functional acrylamide, N,N′,N″,N‴-tetraacryloyltriethylenetetramine (AM4), and hexamethylene diamine (HDA) in H2O without catalyst. Reaction conditions, such as monomer concentration and reaction temperature, affected the morphology of the resulting porous structures. Connected spheres, co-continuous monolithic structures and/or isolated holes were observed on the surface of the porous polymers. These structures were formed by polymerization-induced phase separation via spinodal decomposition or highly internal phase separation. The obtained porous polymers were soft and flexible and not breakable by compression. The porous polymers adsorbed various solvents. An AM4-HDA porous polymer could be plated by Ni using an electroless plating process via catalyzation by palladium (II) acetylacetonate following reduction of Ni ions in a plating solution. The intermediate Pd-catalyzed porous polymer promoted the Suzuki-Miyaura cross coupling reaction of 4-bromoanisole and phenylboronic acid.

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“…A polymer monolith is a single-piece bulk material with a three-dimensionally continuous skeletal structure and pores . This unique structure has attracted considerable attention because o its high surface area, high porosity, fast mass transfer, and high mechanical strength, thus leading to its increased utilization in separation, ion exchange, and catalysis processes . In addition, the polyolefin monolith is suitable for the gaseous oxidation because the activated gas would be able to pass through the penetrated macropores.…”

Section: Introductionmentioning

confidence: 99%

“…17 This unique structure has attracted considerable attention because o its high surface area, high porosity, fast mass transfer, and high mechanical strength, thus leading to its increased utilization in separation, 18 ion exchange, 19 and catalysis processes. 20 In addition, the polyolefin monolith is suitable for the gaseous oxidation because the activated gas would be able to pass through the penetrated macropores. Compared with other polyolefins, poly(4-methyl-1-pentene) (PMP) shows excellent thermal and chemical resistance and low density, which has been widely exploited in medical and scientific equipment.…”

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confidence: 99%

Surface Oxidation of Polymer 3D Porous Structures Using Chlorine Dioxide Radical Gas

Kikkawa

Hsu

Cui

et al. 2020

ACS Appl. Polym. Mater.

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Recently, several studies have reported using an oxidation method, such as plasma, to introduce polar functional groups to the polymer surface. However, these methods are difficult to use to oxidize polymer 3D porous structures. In this study, an effective oxidation method involving the use of UV light-activated chlorine dioxide radical (ClO 2• ) gas was employed to introduce polar functional groups, such as carboxylic acid and hydroxyl groups, on the surface of interconnected porous structures in a poly(4-methyl-1pentene) (PMP) monolith. This oxidation method is highly promising in the context of ecofriendly production and requires neither sophisticated equipment nor hazardous reagents. The PMP monolith was prepared through a simple thermally induced phase separation technique, and the macropore size of the obtained PMP monolith could be controlled by changing the preparation conditions such as PMP concentration and solvent ratio. The oxidation of the PMP monolith via UV light-activated ClO 2• gas flow-through method proceeded deeper from 2 to 10 mm, as the pore size became larger from 2.2 to 16 μm An increase in the oxidation time and gas flow rate enhanced the introduction ratio of polar functional groups, which led to an increase in water permeability. Furthermore, functional groups were introduced on the surface of the PMP monolith and the internal porous structure was maintained after oxidation. The oxidized monolith showed an adsorption ability of cationic toluidine blue and palladium acetate, which demonstrated the existence of carboxylic acid groups on the oxidized PMP monolith surface. The Pd-loaded PMP monolith can be applied to reduce 4-nitrophenol in a flow reaction system.

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Poly(N‐isopropylacrylamide) gel‐based macroporous monolith for continuous‐flow recovery of palladium(II) ions

Cited by 11 publications

References 24 publications

Aggregation-Induced Expansion of Poly-(N-isopropyl acrylamide) Solutions Observed Directly by the Transient Grating Imaging Technique

Aggregation-Induced Expansion of Poly-(N-isopropyl acrylamide) Solutions Observed Directly by the Transient Grating Imaging Technique

Morphology Control and Metallization of Porous Polymers Synthesized by Michael Addition Reactions of a Multi-Functional Acrylamide with a Diamine

Surface Oxidation of Polymer 3D Porous Structures Using Chlorine Dioxide Radical Gas

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