Structure and dynamics of poly(vinyl alcohol) gels in mixtures of dimethyl sulfoxide and water

Kanaya, Toshiji; Takahashi, Nobuaki; Takeshita, Hiroki; Ohkura, Masatoshi; Nishida, Koji; Kaji, Koichi

doi:10.1038/pj.2011.88

Cited by 34 publications

(17 citation statements)

References 46 publications

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“…By low temperature quenching, the phase separation of PVA is greatly restricted and the PVA chains can crystallize homogeneously in the system with the formation of smaller crystallites, therefore reducing the interference with visible light. [ 28 ] The transmittance slightly decreased with the increase of CNF content, reaching 87%, 84%, and 80% at 600 nm wavelength at 1%, 2%, and 4% CNF contents. The reduced transmittance could be due to the light scattering by the added CNFs.…”

Section: Resultsmentioning

confidence: 99%

Cellulose Nanofibrils Enhanced, Strong, Stretchable, Freezing‐Tolerant Ionic Conductive Organohydrogel for Multi‐Functional Sensors

Zhang

Chen

et al. 2020

Adv Funct Materials

600

420

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To date, ionic conducting hydrogel attracts tremendous attention as an alternative to the conventional rigid metallic conductors in fabricating flexible devices, owing to their intrinsic characteristics. However, simultaneous realization of high stiffness, toughness, ionic conductivity, and freezing tolerance through a simple approach is still a challenge. Here, a novel highly stretchable (up to 660%), strong (up to 2.1 MPa), tough (5.25 MJ m−3), and transparent (up to 90%) ionic conductive (3.2 S m−1) organohydrogel is facilely fabricated, through sol–gel transition of polyvinyl alcohol and cellulose nanofibrils (CNFs) in dimethyl sulfoxide‐water solvent system. The ionic conductive organohydrogel presents superior freezing tolerance, remaining flexible and conductive (1.1 S m−1) even at −70 °C, as compared to the other reported anti‐freezing ionic conductive (organo)hydrogel. Notably, this material design demonstrates synergistic effect of CNFs in boosting both mechanical properties and ionic conductivity, tackling a long‐standing dilemma among strength, toughness, and ionic conductivity for the ionic conducting hydrogel. In addition, the organohydrogel displays high sensitivity toward both tensile and compressive deformation and based on which multi‐functional sensors are assembled to detect human body movement with high sensitivity, stability, and durability. This novel organohydrogel is envisioned to function as a versatile platform for multi‐functional sensors in the future.

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Section: Resultsmentioning

confidence: 99%

Cellulose Nanofibrils Enhanced, Strong, Stretchable, Freezing‐Tolerant Ionic Conductive Organohydrogel for Multi‐Functional Sensors

Zhang

Chen

et al. 2020

Adv Funct Materials

600

420

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“…This phenomenon has been widely applied in the physicochemical, green chemical, and pharmaceutical industries 27,31 . Poly(vinyl alcohol) (PVA) can form a hydrogel in a mixture of water and dimethyl sulfoxide (DMSO) via the cononsolvency effect, attributed to the strong interaction between water and DMSO molecules 28,32‐35 . On the other hand, the strong interaction between water and DMSO molecules makes the water/DMSO binary system have lower freezing temperature than the pure solvents do 36,37 .…”

Section: Introductionmentioning

confidence: 99%

Rapid and scalable fabrication of ultra‐stretchable, anti‐freezing conductive gels by cononsolvency effect

Alsaid

Yao

et al. 2021

EcoMat

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With the emergence of soft electronic devices, the requirements for conductive soft materials are unprecedentedly high. Among various soft materials, hydrogels are gaining tremendous attention for their superior softness, wetness, responsiveness, and biocompatibility. However, hydrogels inevitably lose elasticity and ionic conductivity at subzero temperature because of water freezing in the polymer matrices, severely limiting applications at low temperatures. Herein, we propose a rapid fabrication strategy to produce anti‐freezing conductive gels with poly(vinyl alcohol) on a large scale within minutes (vs hours/days in conventional methods) using a water/DMSO binary liquid system, which serves as gelation inducer via cononsolvency and anti‐freezing solvents simultaneously. The gel with 60 wt% DMSO shows the best anti‐freezing performance, remaining unfrozen at temperatures lower than −50°C, while also maintaining the highest mechanical properties with a tensile strength of 1.1 MPa, toughness of 10.9 MJ/m3, and elongation of 1500% outperforming the most previous reports. After incorporating H2SO4, the gels exhibit a high ionic conductivity of 5.25 S/m and maintain 1.65 S/m even at −50°C. Furthermore, an all‐in‐one supercapacitor is fabricated to demonstrate the potential of the anti‐freezing gel in soft device applications with good performance at subzero temperatures. A full recyclability of the material was also demonstrated.

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“…[26][27][28][29][30][31][32][33][34][35][36][37] Among them, PVA gels are useful as biomaterials due to their high strength, high water absorbency, low toxicity, and high biocompatibility; many reports on their practical applications in a variety of fields have been published. [26][27][28][29]38 PVA can be physically crosslinked by the freeze-thawing (FT) method in water 34,39,40 or in a dimethyl sulfoxide (DMSO)-water mixed solvent, [41][42][43] which introduces microcrystallites as crosslinks. PVA can also be chemically crosslinked using glutaraldehyde (GA) 44,45 or multifunctional reactive compounds, 46 as well as by crosslinking PVA in either solid or solution state by irradiation with a g-ray or electron beam.…”

Section: Introductionmentioning

confidence: 99%

Swelling and mechanical properties of physically crosslinked poly(vinyl alcohol) hydrogels

Suzuki

Sasaki

2015

Proc Inst Mech Eng H

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Physically crosslinked poly(vinyl alcohol) gels are versatile biomaterials due to their excellent biocompatibility. In the past decades, physically crosslinked poly(vinyl alcohol) and poly(vinyl alcohol)-based hydrogels have been extensively studied for biomedical applications. However, these materials have not yet been implemented due to their mechanical strength. Physically crosslinked poly(vinyl alcohol) gels consist of a swollen amorphous network of poly(vinyl alcohol) physically crosslinked by microcrystallites. Although the mechanical properties can be improved to some extent by controlling the distribution of microcrystallites on the nano- and micro-scales, enhancing the mechanical properties while maintaining high water content remains very difficult. It may be technologically impossible to significantly improve the mechanical properties while keeping the gel's high water absorbance ability using conventional fabrication methods. Physical and chemical understandings of the swelling and mechanical properties of physically crosslinked poly(vinyl alcohol) gels are considered here; some promising strategies for their practical applications are presented. This review focuses more on the recent studies on swelling and mechanical properties of poly(vinyl alcohol) hydrogels, prepared using only poly(vinyl alcohol) and pure water with no other chemicals, as potential biomedical materials.

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Structure and dynamics of poly(vinyl alcohol) gels in mixtures of dimethyl sulfoxide and water

Cited by 34 publications

References 46 publications

Cellulose Nanofibrils Enhanced, Strong, Stretchable, Freezing‐Tolerant Ionic Conductive Organohydrogel for Multi‐Functional Sensors

Cellulose Nanofibrils Enhanced, Strong, Stretchable, Freezing‐Tolerant Ionic Conductive Organohydrogel for Multi‐Functional Sensors

Rapid and scalable fabrication of ultra‐stretchable, anti‐freezing conductive gels by cononsolvency effect

Swelling and mechanical properties of physically crosslinked poly(vinyl alcohol) hydrogels

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