Reactive poly(ethylene-co-vinyl alcohol) monoliths with tunable pore morphology for enzyme immobilization

Wang, Guowei; Uyama, Hiroshi

doi:10.1007/s00396-015-3637-1

Cited by 20 publications

(10 citation statements)

References 38 publications

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“…Before enzyme immobilization, the hydroxyl groups of the EVOH monolith were activated with CDI in anhydrous ACN solution. The activated EVOH monolith contained imidazolyl carbamate groups which could react with free amino groups in the enzyme . Catalase was immobilized on the activated hydrophilic EVOH monolith.…”

Section: Resultsmentioning

confidence: 99%

“…Because of its hydrophilicity, biocompatibility, thermal stability, and chemical resistance, EVOH has great potential to be used as a unique biomedical material . Recently, we have fabricated an EVOH‐based monolith by using TIPS technique for the first time . The EVOH monolith possessing hydrophilic hydroxyl groups has many superior properties over other hydrophobic polymers for enzyme immobilization …”

Section: Introductionmentioning

confidence: 99%

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Immobilization of catalase onto hydrophilic mesoporous poly(ethylene‐co‐vinyl alcohol) monoliths

Wang

Xin

Han

et al. 2015

J of Applied Polymer Sci

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Poly(ethylene-co-vinyl alcohol) monoliths have been fabricated by a thermally induced phase separation method. Catalase was immobilized onto the monolith surfaces after activating the hydroxyl groups of the monolith in the presence of carbonyldiimidazole. The immobilized catalase exhibited the same optimum pH and temperature values to those of the free catalase. In addition, the immobilized catalase showed better thermal stability and high reusability.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Immobilization of catalase onto hydrophilic mesoporous poly(ethylene‐co‐vinyl alcohol) monoliths

Wang

Xin

Han

et al. 2015

J of Applied Polymer Sci

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“…[22,23] Our research group reported that a solution of poly(methyl methacrylate) (PMMA) and its copolymer with glycidyl methacrylate-which was dissolved in a mixture of heated ethanol and water-formed a solid white monolith after cooling and drying. [24,25] In addition, monoliths of a series of other polymers such as polyacrylonitrile copolymer, [26] poly(γ-glutamic acid), [27] poly(ethylene-co-vinyl alcohol), [28] poly(l-lactic acid), [29] and cellulose acetate (CA) [30] have been developed using the TIPS method.…”

Section: Introductionmentioning

confidence: 99%

Christiansen Effect‐Based Physical Coloration of a Cellulosic Monolith Conveniently Fabricated Using Thermally Induced Phase Separation

Takéuchi

Hayashi

Uyama

2020

Macro Chemistry & Physics

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dependence-of the refractive indexes of two phases is significantly different. Unlike for dyes and pigments, the physical coloration based on the Christiansen effect is not caused by light absorption, and thus color fading in a two-phase system with stable chemical structures hardly occurs. Therefore, coloration based on the Christiansen effect has been expected to provide novel colored materials with high long-term stability, like structural coloration. [3,4] A number of studies of the Christiansen effect have been reported; [5-7] however, there have been few studies of organic polymers exhibiting this interesting effect. [8-10] Recently, monoliths-3D porous materials with bicontinuous structure-have been attracting significant attention in science and engineering fields owing to their unique properties. [11,12] Monoliths are composed of nanometer-scale to micrometer-scale skeletons and pores, and thus possess high specific surface area and porosity. A monolithic molded column generally shows a better fluid permeability than hydrogel beads or a porous powder column. Owing to these characteristics, monoliths are promising in many applications such as chromatographic columns, adsorbents for environmental pollutants, immobilized catalyst supports, and oil/water separation. [13-17] Numerous methods for fabricating polymer monoliths from their monomers have been developed, including polymerization-induced phase separation, high internal phase emulsion templating, cryogelation, and electron beam curing. [18-21] However, methods that use monomers as the starting material have disadvantages, including the need for additives such as emulsifiers and porogens, as well as time-consuming and complicated procedures. In addition, precise control of the conditions must be simultaneously maintained during the polymerization and phase separation to achieve a homogeneous porous structure. Polymer monoliths can also be directly fabricated from polymer solutions using the phase separation method. When an appropriate stimulus-such as cooling, addition of nonsolvent, or solvent evaporation-is applied to a homogeneous polymer solution, sequential phase separation proceeds and results in the formation of a polymer monolith. The thermally induced phase separation (TIPS) method is a facile way of A cellulose acetate (CA) polymer monolith is conveniently fabricated using the thermally induced phase separation method. When a CA monolith in sheet form is immersed in a non-solvent mixture with a suitable refractive index, transparent coloration due to the Christiansen effect is observed. This colorization is arbitrarily controlled by temperature and the non-solvent composition. The wavelength of maximum transmission of the immersed monolith spectrum increases-with high sensitivity-at high temperatures and in non-solvent with a low refractive index, while being independent of the monolith morphology. Following the alkali hydrolysis of the CA monolith, the transmission spectrum of regenerated cellulose monolith immersed in mixed non-solvent cle...

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“…We have achieved facile fabrication of porous monoliths from polymer solutions using thermally induced phase separation (TIPS). Monoliths of PMMA, poly(acrylonitrile), poly(vinyl alcohol), poly(ethylene- co -vinyl alcohol), and poly(γ-glutamic acid) were successfully prepared by selecting an appropriate mixed solvent. − Additionally, organic–inorganic hybrid monoliths were also prepared by TIPS, which were applied for battery materials, adsorbents, separation media, and catalyst carriers. − …”

Section: Introductionmentioning

confidence: 99%

Hierarchical Porous Carbons from Poly(methyl methacrylate)/Bacterial Cellulose Composite Monolith for High-Performance Supercapacitor Electrodes

Bai

Xiong

Liu

et al. 2017

ACS Sustainable Chem. Eng.

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This study deals with hierarchical porous carbons from bacterial cellulose (BC), having a layered structure for high-performance application, such as supercapacitor electrodes, fabricated from a composite monolith with unique microscopic/macroscopic morphology. A poly(methyl methacrylate) (PMMA)/BC composite monolith was first synthesized by thermally induced phase separation using ethanol and deionized water as solvents, where BC acts as the main carbon source as well as matrix and PMMA acts as the activator source producing the necessary activation material. Scanning electron microscopy analysis showed that a monolithic skeleton of PMMA was loaded uniformly on the nanofibers of BC to form a three-dimensional entangled structure of the PMMA skeleton and BC nanofibers, as observed in the microscopic view. Furthermore, the macroscopic twodimensional layered structure of BC remained in the as-obtained composite. The specific surface area, structural features, and thermal stability were investigated by Brunauer−Emmett−Teller, X-ray diffraction, and thermogravimetric analysis studies. The resulting PMMA/BC composite was carbonized and activated by KOH at 850 °C. The electrochemical properties were characterized by cyclic voltammetry, galvanostatic charge−discharge, and electrochemical impedance spectroscopy showing that the carbonization product of the composite displayed a high specific capacitance of 266 F g −1 at a current density of 0.50 A g −1 and the energy density reached a maximum of 23.6 W h kg −1 at a power density of 200 W kg −1 . Moreover, 95% of the capacitance was retained after 10,000 charge−discharge cycles, which implies exceptionally high cyclic stability. This compatible and excellent electrochemical performance of the composite, in terms of the energy density and capacitance retention, can be contributed to the characteristic porous structure of the precursor composite monolith. The present research delineates a new approach to fabricate high-performance supercapacitor materials and low-cost energy storage devices from inexpensive bioresources.

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Reactive poly(ethylene-co-vinyl alcohol) monoliths with tunable pore morphology for enzyme immobilization

Cited by 20 publications

References 38 publications

Immobilization of catalase onto hydrophilic mesoporous poly(ethylene‐co‐vinyl alcohol) monoliths

Immobilization of catalase onto hydrophilic mesoporous poly(ethylene‐co‐vinyl alcohol) monoliths

Christiansen Effect‐Based Physical Coloration of a Cellulosic Monolith Conveniently Fabricated Using Thermally Induced Phase Separation

Hierarchical Porous Carbons from Poly(methyl methacrylate)/Bacterial Cellulose Composite Monolith for High-Performance Supercapacitor Electrodes

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