A low-cost piezoresistive pressure sensor with a wide strain range – featuring polyurethane sponge@poly(vinyl alcohol)/sulfuric gel electrolyte

2021 ◽  
Author(s):  
Haonan Cheng ◽  
Bo Wang ◽  
Kun Yang ◽  
Chaoxia Wang
Keyword(s):  
Pressure Sensor ◽  
Vinyl Alcohol ◽  
Low Cost ◽  
Strain Range ◽  
Human Movement ◽  
Poly Vinyl Alcohol ◽  
Piezoresistive Pressure Sensor ◽  
One Step ◽  
Polyurethane Sponge ◽  
Movement Monitoring

A low-cost and high-compressibility PVA/H2SO4@PU composite was prepared by one-step dipping to realize human movement monitoring.

New preparation approach, electrical and mechanical properties of poly(vinyl alcohol)-loaded graphene films

2019 ◽  
pp. 089270571987394
Author(s):  
Osama Saber ◽  
Mohammed Abu-Abdeen ◽  
A Aljaafari ◽  
Javed Mazher ◽  
Mohamad M Ahmed ◽  
...  
Keyword(s):  
Polymer Matrix ◽  
Vinyl Alcohol ◽  
Graphene Nanosheets ◽  
Low Cost ◽  
High Mass ◽  
Poly Vinyl Alcohol ◽  
Graphene Sheets ◽  
Electron Microscopic ◽  
Transmission Electron ◽  
One Step

Previous publications showed that graphene sheets polymer nanocomopsites were prepared by incorporating previously prepared graphene into the polymer matrix through two or more successive steps. In this work, graphene sheets were exfoliated from graphite inside the polymer matrix solution for certain period in one step. This approach was easy to perform, low cost, high mass production of graphene and, almost, produces effective results. In this respect, electrolytic solution from poly(vinyl alcohol) (PVA) and salt was prepared and exfoliation process took place inside it for different times. After that, solution was dried to get films of PVA loaded with different concentrations of graphene sheets. Scanning electron microscopic and transmission electron microscopic images of exfoliated graphene sheets were studied. Raman spectroscopy of graphite, graphene nanosheets, and PVA-loaded graphene was studied. The dielectric permittivity, dielectric loss, and alternating current electrical conductivity were studied and had maximum values at 10 min of exfoliation time. Cole–Cole impedance plots show semicircles behavior with lowest radius for samples prepared at 10 min. The elastic modulus was found to have a maximum value at exfoliation time of 30 min.

Nickel Nanoparticles Supported on Diphenylphosphinated Poly(Vinyl Alcohol-Co-ethylene) as a New Heterogeneous and Recyclable Catalyst for Mizoroki–Heck Reactions

2017 ◽  
Vol 41 (9) ◽  
pp. 541-546 ◽  
Author(s):  
Farzaneh Ebrahimzadeh
Keyword(s):  
Vinyl Alcohol ◽  
Nickel Nanoparticles ◽  
Supported Catalysts ◽  
Low Cost ◽  
Poly Vinyl Alcohol ◽  
X Ray Diffraction ◽  
Heck Reactions ◽  
Modified Polymer ◽  
Transmission Electron ◽  
High Metal

Nickel nanoparticles (NiNPs) supported on diphenylphosphinated poly(vinyl alcohol- co-ethylene) (DPP-PVA- co-PE) were synthesised by first reacting poly(vinyl alcohol- co-ethylene) with chlorodiphenylphosphine (ClPPh2) under basic conditions and then treating the product with Ni(OAc)2 followed by reduction with NaBH4. (DPP-PVA- co-PE)-NiNPs, a new metallised polymer, was then shown to efficiently catalyse Mizoroki–Heck reactions of aryl iodides, bromides or activated chlorides with olefins such as styrene and n-butyl acrylate in dimethylformamide. In contrast with other polymer-supported catalysts, the main advantage of this method is the low cost of the catalyst due to the simple synthetic route using easily obtained materials and good recoverability. Transmission electron microscopy and X-ray diffraction measurements were used to show the high metal dispersion and small sizes of Ni nanoparticle on the surface of the modified polymer. DPP-PVA- co-PE-NiNPs could be recycled several times.

scholarly journals One-step fabrication and characterization of a poly(vinyl alcohol)/silver hybrid nanofiber mat by electrospinning for multifunctional applications

RSC Advances ◽  
2017 ◽  
Vol 7 (8) ◽  
pp. 4830-4839 ◽  
Author(s):  
Chun-Gang Yuan ◽  
Shiwei Guo ◽  
Jian Song ◽  
Can Huo ◽  
Yukai Li ◽  
...  
Keyword(s):  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
One Step ◽  
Fabrication And Characterization ◽  
Hybrid Nanofiber

Preparation and application of a poly(vinyl alcohol)/silver hybrid nanofiber mat by electrospinning.

One-Step Construction of Antifogging and Frost-Resisting Coatings on Flexible Substrates

2015 ◽  
Vol 14 (01n02) ◽  
pp. 1460015 ◽  
Author(s):  
Xiaojie Zhang ◽  
Junhui He
Keyword(s):  
Aqueous Solution ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Flexible Substrates ◽  
Average Transmittance ◽  
One Step

We here report a facile one-step approach to construction of antifogging and frost-resisting coatings on flexible substrates from poly(vinyl alcohol) (PVA). Excellent antifogging and frost-resisting properties were observed, and are derived from the hydrophilicity and hygroscopicity of coatings. The coatings are highly transparent, and the average transmittance of coatings increases with increase of the concentration of PVA aqueous solution.

scholarly journals Green Approach to the Synthesis of Poly(Vinyl Alcohol)-Silver Nanoparticles Hybrid Using Rice Husk Extract and Study of its Antibacterial Activity

2020 ◽  
Vol 10 (5) ◽  
pp. 6474-6480
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Green Synthesis ◽  
Rice Husk ◽  
Vinyl Alcohol ◽  
Low Cost ◽  
Agricultural Waste ◽  
Water Soluble ◽  
Poly Vinyl Alcohol ◽  
Green Approach

Green synthesis of silver nanoparticles (AgNPs) using rice husk (RH) as low-cost agricultural waste material has been gaining importance in recent years. Meanwhile, poly (vinyl alcohol) (PVA) is reported to involve in the green production of AgNPs as low-cost, water-soluble, biocompatible and biodegradable stabilizing polymer. The present study is focussed on the green synthesis of poly (vinyl alcohol) (PVA) - silver nanoparticles (PVA-AgNPs) hybrid using rice husk extract as a reducing agent. The results recorded from UV–vis spectrum and transmission electron microscopy (TEM) support the characterization of AgNPs produced. Synthesised PVA-AgNPs hybrid revealed effective antibacterial activity against Escherichia coli and Bacillus sp.

Green fabrication of antibacterial polymer/silver nanoparticle nanohybrids by dual-spinneret electrospinning

RSC Advances ◽  
2015 ◽  
Vol 5 (50) ◽  
pp. 40141-40147 ◽  
Author(s):  
Runze Wang ◽  
Zheng Wang ◽  
Song Lin ◽  
Cheng Deng ◽  
Fan Li ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Silver Nanoparticle ◽  
Vinyl Alcohol ◽  
Waterborne Polyurethane ◽  
Poly Vinyl Alcohol ◽  
One Step

Nanohybrids from waterborne polyurethane, poly(vinyl alcohol) and silver nanoparticles of ultrasmall sizes (5.1 ± 0.6 nm) are facilely obtained by directly one-step dual-spinneret electrospinning fabrication in water without additional chemicals.

scholarly journals Enhanced Mechanical and Antibacterial Properties of Nanocomposites Based on Poly(vinyl Alcohol) and Biopolymer-Derived Reduced Graphene Oxide

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 615
Author(s):  
Beom-Gon Cho ◽  
Shalik Ram Joshi ◽  
Seongjin Lee ◽  
Shin-Kwan Kim ◽  
Young-Bin Park ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Vinyl Alcohol ◽  
Bacterial Colonization ◽  
Low Cost ◽  
Critical Concentration ◽  
Antibacterial Properties ◽  
Single Step ◽  
Poly Vinyl Alcohol ◽  
Reduced Graphene

Functionalized graphene–polymer nanocomposites have gained significant attention for their enhanced mechanical, thermal, and antibacterial properties, but the requirement of multi-step processes or hazardous reducing agents to functionalize graphene limits their current applications. Here, we present a single-step synthesis of thermally reduced graphene oxide (TrGO) based on shellac, which is a low-cost biopolymer that can be employed to produce poly(vinyl alcohol) (PVA)/TrGO nanocomposites (PVA–TrGO). The concentration of TrGO varied from 0.1 to 2.0 wt.%, and the critical concentration of homogeneous TrGO dispersion was observed to be 1.5 wt.%, below which strong interfacial molecular interactions between the TrGO and the PVA matrix resulted in improved thermal and mechanical properties. At 1.5 wt.% filler loading, the tensile strength and modulus of the PVA–TrGO nanocomposite were increased by 98.7% and 97.4%, respectively, while the storage modulus was increased by 69%. Furthermore, the nanocomposite was 96% more effective in preventing bacterial colonization relative to the neat PVA matrix. The present findings indicate that TrGO can be considered a promising material for potential applications in biomedical devices.

One-Step Mild Preparation of Tough and Reversible Poly(vinyl alcohol) Hydrogels Induced by Small Molecules

2021 ◽  
Author(s):  
Chuang Dong ◽  
Jiahua Zhou ◽  
Dongjian Shi ◽  
Yufang Song ◽  
Xi Yu ◽  
...  
Keyword(s):  
Small Molecules ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Freeze Thaw ◽  
One Step ◽  
Pva Hydrogel

To overcome shortcomings of traditinal freeze-thaw method for PVA hydrogel preparation, we develop a one-step mild method, which induces PVA crystallization to form hydrogels through small molecules containing hydroxyl and...

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