Water structure in poly(2‐hydroxyethyl methacrylate): Effect of molecular weight of poly(2‐hydroxyethyl methacrylate) on its property related to water

Mochizuki, Akira; Ogawa, Haruki; Nishimori, Yusuke

doi:10.1002/app.35544

Cited by 7 publications

(5 citation statements)

References 23 publications

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“…Analogous poorly resolved multipeaks with distinct submaxima and composed of several endothermic peaks were observed by us earlier for polyelectrolyte complexes composed of chitosan and sodium alginate 19 and by others for different polymers. 33,35,36 Sometimes only asymmetric DSC freezing peaks in hydrated polymers were observed. For example, Mochizuki et al have recently observed asymmetric shape of the fusion peaks for poly-HEMA and concluded on the existence of at least two types of water.…”

Section: State Of Water In Non-crosslinked and Crosslinked Chitosan Mmentioning

confidence: 96%

“…For example, Mochizuki et al have recently observed asymmetric shape of the fusion peaks for poly-HEMA and concluded on the existence of at least two types of water. 35 It can be suggested that within the broad transitional envelope there are several metastable states of water due to the water interacting and being bound with different binding sites of the polysaccharide structure and=or the freezable water exists in different environments.…”

Section: State Of Water In Non-crosslinked and Crosslinked Chitosan Mmentioning

confidence: 99%

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Water state in chemically and physically crosslinked chitosan membranes

Ostrowska-Czubenko

Pieróg

Gierszewska

2013

J of Applied Polymer Sci

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Chemically and physically crosslinked chitosan membranes were prepared by treating chitosan (Ch) with glutaraldehyde (GA) and sulfuric acid (SA). FTIR and XRD results were employed to confirm the formation of covalent and ionic crosslinks between Ch, GA, and SA. The states of water in non-crosslinked and covalently and ionically crosslinked chitosan membranes containing different amount of water were investigated by low temperature differential scanning calorimetry measurements. The equilibrium swelling in water was examined gravimetrically. Two types of water were found in the polymer samples, i.e., freezing water and nonfreezing water. The effect of crosslinking process on water state and water uptake was analyzed. The water uptake decreased after chitosan crosslinking with GA, but significantly increased after later crosslinking with SA. The amount of non-freezing water was generally smaller in crosslinked membranes. An impact of molecular and supermolecular structure on water uptake and state of water in non-crosslinked and crosslinked chitosan membranes was discussed.

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Section: State Of Water In Non-crosslinked and Crosslinked Chitosan Mmentioning

confidence: 96%

Section: State Of Water In Non-crosslinked and Crosslinked Chitosan Mmentioning

confidence: 99%

Water state in chemically and physically crosslinked chitosan membranes

Ostrowska-Czubenko

Pieróg

Gierszewska

2013

J of Applied Polymer Sci

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“…The polarization curves recorded using the RuO 2 −polymer combinations (x = 0.10) shown in Figure 5b and the plot of the overpotential versus the swelling ratio (Figure 5c) reveal the critical impact of the hydrogel character and swelling of the polymer. For example, the swelling decreases with increasing molecular weight (of a given polymer) and the associated crystallinity; 24 PHEMA with a higher molecular weight (PHEMA300) and hence lower swelling ratio shows lower efficiency. The scenario depicted graphically in Figure 5d, the polymer swollen with the electrolyte surrounding the catalyst nanoplates decorating the conducting substrate, leads to the efficient electrocatalysis.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

In Situ-Fabricated Hydrogel Polymer—Semiconductor Nanocomposite Thin Film as a Highly Efficient and Robust Electrocatalyst for Hydrogen Evolution Reaction

Madhuri

Radhakrishnan

2019

J. Phys. Chem. C

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Development of simple and facile protocols for the fabrication of highly efficient and robust catalytic electrodes for water splitting reactions is of paramount interest in establishing clean energy generation strategies. We show that hydrogel polymer thin films, in spite of their insulating character, enable a unique solution of wide scope, combining the ease of in situ fabrication of the electrocatalyst and efficient application. RuO 2 nanoplates are generated within thin films of poly(hydroxyethyl methacrylate) (PHEMA) spincast on Ni foam, through mild thermal annealing. RuO 2 -PHEMA affects efficient hydrogen evolution reaction (HER) in an alkaline medium, with a very low overpotential of 30 mV at a current density of 10 mA cm −2 and stability for 24 h at 40 mA cm −2 ; Faradaic efficiency is 99.6%, and the turnover frequency is 24.2 s −1 at 100 mV overpotential. Experiments with a range of polymers establish a clear correlation between the swelling characteristic of the polymer and the overpotential for HER. Efficient water splitting using a cell with both electrodes based on polymer-semiconductor nanocomposite thin films is also demonstrated. The novel catalytic electrode design offers abundant scope for developing costeffective and scalable strategies for the generation of hydrogen fuel.

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“…[36] These results thus revealed that the polyMMA segment played an important role in the formation of both non-freezing water II and the cold-crystallizable water and that the effective polyMMA segment length for formation of the waters ranged from 2000 to 4000. The non-freezing water II molecules are expected to have a lower mobility than free water and a higher mobility than the intrinsic non-freezing water molecules bound to the HEMA hydroxyl groups.…”

Section: Journal Of Biomaterials Science Polymer Edition 759mentioning

confidence: 95%

Study of the water structure in poly(methyl methacrylate-block-2-hydroxyethyl methacrylate) and its relationship to platelet adhesion on the copolymer surface

Mochizuki

Namiki

Nishimori

et al. 2015

Journal of Biomaterials Science, Polymer Edition

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The water structure and platelet compatibility of poly(methyl methacrylate (MMA)-block-2-hydroxyethyl methacrylate (HEMA)) were investigated. The molecular weight (Mn) of the polyHEMA segment was kept constant (average: 9600), while the Mn of the polyMMA segment was varied from 1340 to 7390. The equilibrium water content of the copolymers was found to be mainly governed by the HEMA content. The water structure in the copolymers was characterized in terms of the amounts of non-freezing and freezing water (abbreviated as Wnf and Wfz, respectively) using differential scanning calorimetry. It was found that the Wnf for the copolymers were higher than those estimated from the Wnf for the HEMA and MMA homopolymers and that the amount of excess non-freezing water depended on the polyMMA segment length. In addition, X-ray diffraction analysis revealed that some of the copolymers had cold-crystallizable water. These facts suggested that the polyMMA segments were involved in determining the water structures in the copolymers. Furthermore, the platelet compatibility of the copolymers was improved as compared to that of the HEMA homopolymer. It was therefore concluded that the platelet compatibility of the copolymer was related to the amount of excess non-freezing water.

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Water structure in poly(2‐hydroxyethyl methacrylate): Effect of molecular weight of poly(2‐hydroxyethyl methacrylate) on its property related to water

Cited by 7 publications

References 23 publications

Water state in chemically and physically crosslinked chitosan membranes

Water state in chemically and physically crosslinked chitosan membranes

In Situ-Fabricated Hydrogel Polymer—Semiconductor Nanocomposite Thin Film as a Highly Efficient and Robust Electrocatalyst for Hydrogen Evolution Reaction

Study of the water structure in poly(methyl methacrylate-block-2-hydroxyethyl methacrylate) and its relationship to platelet adhesion on the copolymer surface

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