Results 291 to 300 of about 967,661 (341)
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Polyvinyl Alcohol and Polyvinyl Acetate
2020Basically only ethylene and air are needed for the production of polyvinyl acetate (PVAc) and its polymer analogous products, such as polyvinyl alcohol and polyvinyl butyrate. Polyvinyl acetate serves as the precursor for polyvinyl alcohol and, directly or indirectly, the polyvinyl acetals.
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, 2021
The high porosity of calcium alginate hydrogels was controlled by its treatment with polyvinyl alcohol followed by cross-linking with diboronic acids, which blocks larger pores in calcium alginate....
D. Massana Roquero +3 more
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The high porosity of calcium alginate hydrogels was controlled by its treatment with polyvinyl alcohol followed by cross-linking with diboronic acids, which blocks larger pores in calcium alginate....
D. Massana Roquero +3 more
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Stereoregularity in polyvinyl alcohols and esters [PDF]
Journal of Polymer Science Part A: General Papers, 1963 AbstractFrom solution properties and x‐ray crystallinities of polyvinyl esters and alcohols derived from several vinyl esters polymerized at different temperatures, it is considered that polyvinyl haloacetates are more regular in structure than polyvinyl acetate, but this regularity has not been proved to result from increased syndiotacticity.
G. Vaughan, F. R. Johnston, W. Cooper
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Syndiotactic polyvinyl formate and derived polyvinyl alcohol
Journal of Polymer Science Part A: General Papers, 1963AbstractA study was made of the effect of polymerization temperature on the syndiotacticity of polyvinyl formate. Vinyl formate was polymerized with ultraviolet light initiation in the temperature range from −20 to +30°C. The value of (Ep — Et)/2 obtained, 4.5 kcal./mole, is characteristic of those values obtained by other workers for the free radical ...
George H Mccain +3 more
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The chemical record, 2020
The properties of polyvinyl alcohol (PVA) nanocomposite hydrogels influenced by nanoparticles are reviewed. Various kinds of nanoparticles with excellent mechanical and electrical properties have been introduced into PVA hydrogel to produce stretchable ...
N. Wen +10 more
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The properties of polyvinyl alcohol (PVA) nanocomposite hydrogels influenced by nanoparticles are reviewed. Various kinds of nanoparticles with excellent mechanical and electrical properties have been introduced into PVA hydrogel to produce stretchable ...
N. Wen +10 more
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Residual water in polyvinyl alcohol [PDF]
Polymer Science Series A, 2014 The state of sorbed water molecules in the matrix of polyvinyl alcohol is investigated via the methods of static sorption, DSC, TGA, IR Fourier spectroscopy, 1H NMR spectroscopy, and quantum-chemical simulation. It is shown that the sorption of water by polyvinyl alcohol characterized by an S-shaped isotherm is described by the double-sorption model ...
Yu. V. Kostina +6 more
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Polyvinyl alcohol: A review of research status and use of polyvinyl alcohol based nanocomposites
Polymer Engineering & Science, 2018This review presents the nature, fundamental structure, and various morphologies of native poly(vinyl alcohol) (PVA) matrix. It highlights recent advances in pure PVA and its composites containing various nanofillers that have potential applications in various fields. Over half a century, PVA is known as an auspicious material for diverse applications.
Muhammad Aslam +2 more
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Applied Mechanics and Materials, 2015
The effects of the polyvinyl alcohol (PVA) concentration on mechanical properties of hydrogels based on blends of native or denatured collagen / PVA were examined. Blends of PVA with collagen were obtained by mixing the solutions in different ratios, using glycerol as a plasticizer.
Jan Vesely +5 more
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The effects of the polyvinyl alcohol (PVA) concentration on mechanical properties of hydrogels based on blends of native or denatured collagen / PVA were examined. Blends of PVA with collagen were obtained by mixing the solutions in different ratios, using glycerol as a plasticizer.
Jan Vesely +5 more
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Chemical Engineering Journal, 2015
Abstract Highly stretchable polyvinyl alcohol (PVA) films with a strain at break of around 700% were obtained from solutions in trifluoroacetic acid (TFA). Structural and chemical analysis by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (ATR–FTIR) showed that TFA is retained by PVA via hydrogen bonds between the carboxylic acid
Susana Guzman-Puyol +6 more
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Abstract Highly stretchable polyvinyl alcohol (PVA) films with a strain at break of around 700% were obtained from solutions in trifluoroacetic acid (TFA). Structural and chemical analysis by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (ATR–FTIR) showed that TFA is retained by PVA via hydrogen bonds between the carboxylic acid
Susana Guzman-Puyol +6 more
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Investigation of polyvinyl alcohol solutions
Polymer Science U.S.S.R., 1973Investigation of the properties and structure of solutions of polyvinyl alcohol (PVA) in dimethylformamide, dimethylsulphoxide and water in the temperature range 25–150°C by polarized-light microscopy, X-ray analysis, IR spectroscopy and the Rayleigh scattering of light has shown that “crystalline” separation is observed in the case of PVA solutions in
A.A. Anikeyeva +3 more
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