scholarly journals A study of the influence of polyvinyl pyrrolidone concentration in the deposition electrolyte on the properties of electrochromic Ni(OH)2 films

2020 ◽  
Vol 4 (6 (106)) ◽  
pp. 31-37
Author(s):  
Valerii Kotok ◽  
Vadym Kovalenko
Keyword(s):  
Polyvinyl Pyrrolidone ◽  
Deposition Electrolyte

Electrospun polyacrylonitrile/polyvinyl pyrrolidone composite nanofibrous membranes with high-efficiency PM2.5 filter

2020 ◽  
Vol 40 (6) ◽  
pp. 487-493
Author(s):  
Chen Wang ◽  
Kun Yan ◽  
Jun Wang ◽  
Siyu Chen ◽  
Jiaming Cui ◽  
...  
Keyword(s):  
Pore Structure ◽  
Composite Nanofibers ◽  
High Efficiency ◽  
Fine Particulate Matter ◽  
Polyvinyl Pyrrolidone ◽  
Indoor Dust ◽  
Mass Ratio ◽  
Filter Efficiency ◽  
Fine Particulate ◽  
Closed Pore

AbstractIn this research, we successfully fabricated a novel closed pore polyacrylonitrile (PAN)/polyvinyl pyrrolidone (PVP) composite nanofibrous membrane (PCNM) on the substrate of a commercial polypropylene window mesh. First, smooth and uniform PAN/PVP composite nanofibers (PCNs) were manufactured by blending PAN and PVP with a mass ratio of 5:5 during electrospinning. Subsequently, the prepared PCNs were hot pressed in a vacuum drying oven at a given temperature of 90°C. The morphology and filter efficiency of PCN and PCNM were investigated. It was found that hot-pressing treatment significantly affected the pore structure and orientation of PCNM, which contributed to its closed pore structure and good alignment. The filter efficiency results indicated that the hot-pressed PCNMs have excellent removal efficiency of up to 96.8% of fine particulate matter. This research demonstrates that PCNMs have potential as filters for indoor dust removal and will provide a new idea for the development of air filters.

scholarly journals Studies of Polymer Solvation by Dielectric Relaxation Spectroscopy III: Polyvinyl Pyrrolidone in N-Methyl-2-Pyrrolidone, Ethanediol, Methanol, and Water

1990 ◽  
Vol 45 (2) ◽  
pp. 126-134
Author(s):  
E. Dachwitz
Keyword(s):  
Dielectric Relaxation ◽  
Chain Length ◽  
Molar Mass ◽  
Polyvinyl Pyrrolidone ◽  
Dielectric Relaxation Spectroscopy ◽  
Length Effect ◽  
Repeat Units ◽  
Solvent Model ◽  
Spectral Components ◽  
High Concentrations

AbstractThe permittivity of the title solutions has been measured at frequencies between some MHz and 72 GHz at 20 °C. Polyvinyl pyrrolidone of relative molar mass ranging from 1200 to 360 000 has been used. Referring to the concentration of monomeric repeat units (x = 0.65 maximum) there is no significant chain length effect. The permittivity data are described in terms of discrete Debye type spectral components. Special attention is paid to the contributions ascribable to the solvents, which are discussed with respect to their solvation behaviour. This can be described by a three state solvent model as follows. Besides the "bulk" solvent a further contribution is found in any case which is due to loosely affected (slowed down) solvent. Moreover a part of the solvent appears to be tightly bound to the polymer at high concentrations. All the solvents considered show similar solvation properties, notwithstanding their different tendencies towards selfassociation.

Facile synthesis of the crescent-like SnS nanocrystals capped by polyvinyl pyrrolidone and its performance of adsorbing dyes

2021 ◽  
Vol 599 ◽  
pp. 291-299
Author(s):  
Mengru Jin ◽  
Haifeng Shen ◽  
Jiabao Fang ◽  
Zhanjun Zhu ◽  
Jue Chen ◽  
...  
Keyword(s):  
Polyvinyl Pyrrolidone ◽  
Facile Synthesis

Total oxidation of toluene on Pt/CeO2–ZrO2–Bi2O3/γ-Al2O3 catalysts prepared in the presence of polyvinyl pyrrolidone

2010 ◽  
Vol 176 (1-3) ◽  
pp. 1106-1109 ◽  
Author(s):  
Toshiyuki Masui ◽  
Hayato Imadzu ◽  
Naoto Matsuyama ◽  
Nobuhito Imanaka
Keyword(s):  
Polyvinyl Pyrrolidone ◽  
Total Oxidation

scholarly journals Preparation of highly stable polypyrrole dispersions in the mixed aqueous solution of sodium dodecyl sulfate and polyvinyl pyrrolidone

e-Polymers ◽  
2007 ◽  
Vol 7 (1) ◽  
Author(s):  
Xing Shuangxi ◽  
Zhao Guoku
Keyword(s):  
Aqueous Solution ◽  
Sodium Dodecyl Sulfate ◽  
Sodium Dodecyl ◽  
Polyvinyl Pyrrolidone ◽  
Component Solution ◽  
Mixed Aqueous Solution ◽  
Polymeric Stabilizer ◽  
Structure Morphology ◽  
Dodecyl Sulfate ◽  
Proper Mass

AbstractPolypyrrole (PPy) dispersions with high stability were prepared in the mixed aqueous solution comprising an anionic surfactant (sodium dodecyl sulfate, SDS) and a polymeric stabilizer (polyvinyl pyrrolidone, PVP). By choosing proper mass ratios of the surfactant to the monomer, stable dispersions could be obtained owing to the interaction between the two components. The structure, morphology, stability, particle size, polydispersity index and conductivity of the samples obtained from different conditions were investigated. The PPy dispersions prepared from mixed aqueous solutions were much more stable than those from single component solution.

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