JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2022
·Vol. 30
·期 7
·2964-2975
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IF 4.705
He Yao,Tian Huafeng,Xiang Aimin,Ma Songbai,Yin Duoyan,Varada Rajulu A.
In recent years, the treatment of water pollution has been a challenging and far-reaching topic. In order to improve the adsorption performance of polyvinyl alcohol nanofibers, a new nano-adsorbent graphene oxide was introduced into them in this work. The water resistance and stability of nanofibers were improved by crosslinking glutaraldehyde. The introduction of GO greatly increased the adsorption of Cu 2+ , methylene blue (MB) and Congo red (CR). The adsorption kinetics and isotherm analysis of the PVA/GO nanofiber film during the adsorption process showed that the adsorption of Cu 2+ and MB by PVA/GO nanofiber film was mainly chemical adsorption, while the adsorption of CR was mainly physical adsorption. The adsorption process of PVA/GO nanofiber film on Cu 2+ was in line with the Langmuir isothermal adsorption model, that is, single molecular layer adsorption, the distribution of adsorption active sites was relatively uniform, and the increasing temperature was more conducive to the adsorption of Cu 2+ .
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CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Chunhui Luo,Andi Guo,Yufei Zhao,Xinxin Sun
Developing articular cartilage substitutes required a combination of high compressive strength , excellent biocompatibility and low friction. Despite great success in tough hydrogels, this combination was hardly realized. Herein, a high strength, low friction, and biocompatible hydrogel was obtained by freezing-thawing polyvinyl alcohol and chitosan aqueous solutions three times, followed with soaking in sodium alginate aqueous solution. Owing to the synergy of crystalline domains, hydrogen bonds , and ionic interactions, the obtained hydrogel exhibited high strength (maximum compressive strength = 141 MPa). Because of the reversible linkages, the gel was also creep-resistant (recovery efficiency = 93%). Benefitted from the negative carboxyl groups from sodium alginate, the water lubrication layer between the gel and the opposing surface was thickened greatly, resulting in a low coefficient of friction (0.044). The biocompatible materials and green progress led to excellent cell compatibility. All these merits made it an ideal substitute for articular cartilage.
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PubMed
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Mengying Luo,Mufang Li,Ying Lu,Ming Xia,Qinghua Zhao,Dong Wang
With the increasing demand of health monitoring and protection, Point-of-Care Testing has developed rapidly due to its convenience and high efficiency. Here, a visual colorimetric nanofiber-based strip with a hierarchically porous structure was prepared for highly sensitive detection of glucose. To facilitate the subsequent testing, the composites with a hybrid nanoflower structure containing glucose oxidase (GOx), horseradish peroxidase (HRP), 3,3′5,5′-tetramethylbenzidine (TMB) and Mn 3 (PO 4 ) 2 were immobilized on a hierarchically porous PVA- co -PE nanofibrous strip. The obtained strip was used to detect glucose, a strong linear correlation (R 2 = 0.996) was found between the color difference and ln(C glucose ) in the range of 0.25–10 mM glucose. The detection limit is 0.14 mM and a discernible color change could be detected with the naked eye at low glucose concentration, indicating that the strip is highly sensitive to glucose. Additionally, a series of interferences substances including NaCl , KCl and urea were also investigated, and the results showed excellent specificity to glucose. Moreover, the strip exhibits good stability in the pH range of 5–7 and maintains excellent glucose detection performance after 60 days. It demonstrates that this strip is a promising candidate for personal diabetes detection.
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POLYMER TESTING
·
2023
·
IF 5.1
Hai-Yan Wang,Heng-Da Wang,Yu-Qing Zhang
The high molecular weight sericin recovered by using degumming method of high-temperature and high-pressure water was subjected to a Maillard reaction (MR) with xylose, and the resulting xylosylated sericin (XS) has good water solubility. A mechanically robust, soft, and transparent PVA hydrogel composite membrane (PVA-XS) was obtained by mixing XS (20 w%) into an aqueous PVA solution based on unidirectional nanopore dehydration (UND). The mechanical strength, elongation, and elastic modulus of PVA-XS reached 1.68 MPa, 519.83%, and 0.27 MPa, respectively. UND at 85 °C yielded a hydrogel composite membrane with stronger mechanical properties; these values were 9.94 MPa, 627.20%, and 1.49 MPa. These composite hydrogels have 3D porous structures with pore sizes ranging from 2 to 20 μm, and there was no phase separation. Murine L-929 cells adhered, grew, and proliferated normally on the scaffold. The digestion rates of PVA-XS in both trypsin and alkaline protease were faster than that of high temperature-annealed cast PVA-XS (acPVA-XS). Implantation in vivo did not induce an obvious tissue immune response. The mechanical properties and enzymatic degradation rate of PVA-XS were controlled by UND temperature and XS incorporation. Therefore, the UND-based composite hydrogel has potential applications in the implantation, repair, and regeneration of biological tissues.
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Science China-Materials
·
2023
·Vol. 66
·期 12
·4782-4793
·
IF 8.1
Wu Feng,Lin Xiaoying,Xu Yuqian,Zhang Di,He Yunqing,Liu Mingxian
Soft actuators and micro-robots receive significant attention for their potential applications in transportation, photovoltaic conversion devices, clinical care, and other fields. In this work, a polyvinyl alcohol/Chinese ink mixture was uniformly coated on polyethylene film for preparing structure-stabilized bilayer soft actuators. Due to the significant difference in thermal expansion coefficients between the two layers, the actuator can achieve a large bending deformation with a fast response speed under xenon light. A large amplitude of bending angle of 1260° was achieved in 6 s. A soft-body robot similar to an inchworm was constructed by changing the intensity of xenon or near-infrared light combined with the bionic structure design of an inchworm. The robot can realize various forms of movements (such as crawling and pushing boxes) on different surfaces (such as paper and leaves). Light-driven applications such as hands capable of grasping objects (grasping objects 14 times their weight), cats exhibiting variable expressions, elephant trunks performing curling and retraction, and bionic flowers realizing flowering and closing can be realized. In addition, based on the good photothermal conversion and pressure sensing performance of the bilayer actuator, it is able to monitor daily human activities (such as joint flexion, abdominal breathing, water swallowing, and other movements) and integrate with photoelectric conversion devices. This versatile and diverse drive-mode soft robot exhibits significant potential for applications such as wearable devices, transportation, photovoltaic conversion devices, and clinical therapies.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 23
·27524-27533
·
IF 2.478
Wang Wenbo,Liu Botao,Lv Xiaomeng
To achieve adaptation to the heat dissipation effect of electronic devices in the 5G era and improvement of the anisotropic thermal conductivity of the insulating polymer, three-dimensional (3D) PU@BNNS-OH network structure was constructed via layer-by-layer assembly with polyurethane (PU) foam as the robust skeleton of three-dimensional structure, and hydroxylated boron nitride nanosheet (BNNS-OH) as thermal conductive filler. Then PU@BNNS-OH was composited with polyvinyl alcohol (PVA) via microwave-assisted curing method to get the final thermal conductivity composites (PVA/PU@BNNS-OH). The result showed that the interconnected thermal conductivity network was significantly effective in improving the anisotropic thermal conductivity of the composite with high-temperature endurance and moderate mechanical property. When the BNNS-OH coating is 10 wt%, the optimal thermal conductivity of the composite is 4.68 W · \({\mathrm{m}}^{-1}\) · \({\mathrm{K}}^{-1}\) and the thermal conductivity enhancement efficiency is 45.50, which is significantly higher than others reported in the literature. Both the finite element analysis and thermal infrared analysis indicated that the thermal conductivity of the composites was significantly improved and paved the way for its potential application. The present microwave-assisted synthesis strategy is fast and energy-saving and can be widely used for synthesizing different insulated polymer-based thermal interface materials.
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ACS Applied Polymer Materials
·
2021
·
IF 4.089
Danyang Wang,Lu Qin,Weihu Yang,Ye He,Songyue Zhang,Yulu Yang,Kun Xu,Pengfei Gao,Jinxiu Yu,Kaiyong Cai
The conductive material used in traditional conductive hydrogels is inherently rigid, which makes the material’s mechanical properties poor. In addition, the use of chemical covalent bonds to form gels makes the hydrogel lack self-healing properties, which limits the conductivity and the application of gel. Based on the above reasons, we use the characteristics of the strong trivalent iron ion chelating ability to prepare a PVA/PAA/Fe3+ system three-dimensional network structure hydrogel and design a sandwich structure to encapsulate liquid metal gallium indium tin (GaIn) in the hydrogel. Inside, the strong conductivity of the liquid metal is used while protecting the liquid metal from being oxidized. In addition, we explore its mechanical properties, electrical conductivity, self-healing properties, adhesion properties, antibacterial properties, etc. and prove them by tensile stress–strain mechanic experiments, electrical impedance experiments, strain sensor signal detection, and biological signal detection experiments. The results show that the as-prepared hydrogel exhibited excellent self-healing performance and antibacterial ability and has mechanical properties that fit the elastic modulus of the skin. Compared with traditional Ag/AgCl electrodes, it can detect electrocardiogram and other biological signals very well as well as having long-lasting and repeated use.
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NANOTECHNOLOGY
·
2020
·Vol. 32
·期 1
·015101
·
IF 3.551
Baoe Li,Xiaomei Xia,Jiatian Chen,Dan Xia,Ruodan Xu,Xianrui Zou,Hongshui Wang,Chunyong Liang
Electrospun composite nanofibrous scaffolds have been regarded as a potential carrier for local drug delivery to prevent tumor recurrence. Herein, a model drug (paclitaxel) was creatively loaded into lignin nanoparticles (PLNPs) and then encapsulated into the polymer of poly (vinyl alcohol)/polyvinyl pyrrolidone which has been fabricated into a composite nanofibrous membrane (PVA/PVP-PLNPs) for use as a drug carrier using the electrospinning technique. The fabricated PVA/PVP-PLNPs membranes exhibited good particle distribution, mechanical properties, thermal stability and biocompatibility. In vitro experiments showed that combining lignin nanoparticles by electrospinning not only improved the drug release profile, but also enhanced the hydrophilicity of nanofibrous membranes which was beneficial to cell adhesion and proliferation. Cellular experiments demonstrated that PVA/PVP-2%PLNPs membrane showed good cell inhibition ability, and the cell survival rate was only 21% at day 7. It indicates that the as-prepared PVA/PVP-PLNPs composite nanofibers are promising candidates for local anticancer therapy.
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PubMed
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Mingchuan Yu,Hanmin Zhang,Yuezhu Wang,Ran Zhao,Xiaotong Xu,Chengcheng Ge,Xiaoyi Zhang,Fenglin Yang
A new class of hyaluronic acid-graphene oxide/polyvinyl alcohol hybrid monolith (HA-GO/PVA) was prepared through a moderate method and applied as a highly efficient draw agent in Forward Osmosis (FO) process. GO nanosheets and HA were crosslinked with each other over a medical hydrophilic PVA sponge to form a three-dimensional porous monolith through poly (propylene glycol) bis(2-aminopropyl ether). The as-prepared HA-GO/PVA monolith presented a high water flux (13.9 ± 1.09 L m −2 h −1 , abbreviated as LMH) and there was no reverse permeation when the deionized water used as the feed solution. Moreover, it exhibited an excellent compressibility after inducing the PVA substrate which resulting in an easy and quickly process of water production and regeneration. And a longer lifespan which keeping an average water flux of 6.22 LMH during recycle FO process (water recovery ratio = 80%) as high as 300 cycles was obtained. In a real seawater desalination process, the HA-GO/PVA presents a great desalination capacity, and the water fluxes of dry and wet HA-GO/PVA are 7.2 ± 0.45 and 3.9 ± 0.28 LMH, respectively. Simultaneously, the regeneration process can be easily accomplished through squeezing the HA-GO/PVA with an adult palms (15 kPa) in a short-time.
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Polymers
·
2020
·Vol. 12
·期 2
·453
·
IF 3.426
Jufang Zhu,Qiuying Li,Yanchao Che,Xingchen Liu,Chengcheng Dong,Xinyu Chen,Chao Wang
Polyvinyl alcohol (PVA)/carboxyl methyl cellulose sodium (CMC)/Na2CO3composite films with different contents of Na2CO3were prepared by blending and solution-casting. The effect of Na2CO3on the microstructure of PVA/CMC composite film was analyzed by Fourier-transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), differential scanning calorimetry (DSC), and atomic force microscopy (AFM). Its macroscopic properties were analyzed by water sorption, solubility, and dielectric constant tests. The results show that the microstructure of PVA/CMC/Na2CO3composite films was different from that of PVA and PVA/CMC composite films. In addition, compared to PVA and PVA/CMC composite films, the water sorption of PVA/CMC/Na2CO3composite films relatively increased, the solubility in water significantly decreased, and the dielectric properties significantly improved. All these results indicate that the hydrogen bonding interaction between PVA and CMC increased and the crystallinity of PVA decreased after the addition of Na2CO3. This was also a direct factor leading to increased water sorption, decreased solubility, and enhanced dielectric properties. The reaction mechanism of PVA, CMC, and Na2CO3is proposed to further evaluate the effect of Na2CO3on the microstructure and macroscopic properties of PVA/CMC/Na2CO3composite films.Keywords:PVA;CMC;Na2CO3;film
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Soft Matter
·
2020
·Vol. 16
·期 13
·3319-3324
·
IF 3.14
Guangfeng Wu,Kaiyun Jin,Li Liu,Huixuan Zhang
Self-healing hydrogels as renewable materials have attracted significant attention recently. However, traditional self-healing hydrogels require a long time for self-healing and cannot be used at low temperatures. Besides, their poor biocompatibility limits the application of hydrogels. Herein, we have prepared a hydrogel composed of polyvinyl alcohol (PVA) and modified sodium alginate. Due to the dynamic recombination of borate bonds, these hydrogels show a strong self-healing ability, with the shortest self-healing time up to 15 seconds. Also, glycerin (GI) was added into the hydrogel to increase the cold resistance of the hydrogel. At −25 °C, the hydrogel still displayed good frost resistance and elasticity. NaCl and other inorganic salts were added to endow the hydrogel with good electrical conductivity. The hydrogel also had good skin-like properties and could activate the capacitive screen of an electronic device.
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JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Qi Zhong,Guogui Shi,Qing Sun,Peng Mu,Jian Li
Most super-wetting membrane materials are susceptible to oil pollution after separation process, causing a serious degradation of the separation ability. The rough structure of underwater superoleophobic membrane can effectively improve anti-fouling property, thus achieving stable separation. Herein, a composite polyvinyl alcohol-graphene oxide-titanium dioxide (PVA-GO-TiO 2 , PGT) membrane with rough structure is prepared through a simple hydrothermal and suction-filtration method. The as-prepared PGT membrane displays outstanding underwater superoleophobicity even for high-adhesion crude oil. Moreover, the as-fabricated membrane exhibits efficient oil-in-water emulsions separation performance with separation efficiency of larger than 99.1% and permeation flux of over than 762 L m −2 h −1 even after 10 min. Besides, the PGT membrane could separate various oil-in-water emulsions in corrosive environments with separation efficiency of higher than 99.3% and permeation flux of more than 760 L m −2 h −1 . More importantly, the as-prepared membrane could keep the underwater superoleophobicity after sanding test (200 times) and bending test (500 times). The composite membrane with excellent oil-in-water emulsions separation performance, corrosion resistance and mechanical stability has broad prospects in the field of water purification .
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