Results 291 to 300 of about 23,945 (314)
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Kinetics of acetalization of polyvinyl alcohol and of hydrolysis of acetalized polyvinyl alcohol
Die Makromolekulare Chemie, 1959AbstractLa cinétique d'acétalisation de l'alcool polyvinylique au moyen d'acétaldéhyde a été étudiée en soulution dioxanne‐eau à différentes températures en présence d'acide sulfurique comme catalyseur.L'ordre de la réaction est unitaire par rapport à la concentration en acide et en acétaldéhyde.
G. Smets, B. Petit
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IEEE Transactions on Magnetics, 1996
In order to conserve the global environment and improve the durability of particulate magnetic recording media, a new binder material, polyvinyl acetal (PVAc), has been developed to replace polyvinyl chloride (PVC). The crosslinking reactivity of PVAc synthesized at different temperatures was measured.
Hirofumi Kondo, T. Omura
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In order to conserve the global environment and improve the durability of particulate magnetic recording media, a new binder material, polyvinyl acetal (PVAc), has been developed to replace polyvinyl chloride (PVC). The crosslinking reactivity of PVAc synthesized at different temperatures was measured.
Hirofumi Kondo, T. Omura
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Diffusion‐controlled mechanical properties of polyvinyl alcohol and polyvinyl formals
Journal of Applied Polymer Science, 1959AbstractThe elongation of polyvinyl alcohol and of formalized polyvinyl alcohol films under constant load for a wide range of conditions of temperature and humidity seems to be affected predominantly by the diffusion of water molecules into these polymeric films, as these films have many water‐sensitive bonds.
Hitoshi Yamamura, Naoya Kuramoto
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The photolysis of polyvinyl bromide
Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences, 1975Polyvinyl bromide in solution, in dry tetrahydrofuran (THF) yields a black polymer upon exposure to u.v. light of 260 nm or less. This is shown to be the result of ( a ) the elimination of bromine atoms in the primary reaction, and ( b ) the catalysed formation of a conjugated chain by the ...
Ronald George Wreyford Norrish +1 more
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Polyolefins, Polyvinyls, and Acrylics
2012This chapter focuses on polymers made from monomers that contain a carbon–carbon double bond through which the polymer is made by addition polymerization. Chemical structures with effects of heat aging, common stabilizers, manufacturers, and trade names along with typical end uses of the plastics are included besides extensive tabular and graphical ...
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Preparation and Properties of Polyvinyl Alcohol/Polyvinyl Pyrrolidone Blend Films
Applied Mechanics and Materials, 2010A series of poly(vinyl alcohol) (PVA)/ Poly (vinyl pyrrolidone) (PVP) blend films with different weight ratio of PVA to PVP were prepared by solution-mixing method The morphological structures and characterized of the films were observed via scanning electronic microscopy (SEM), Differential scanning calorimetry (DSC) and Fourier transform infrared ...
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Diethylphosphonacetals of polyvinyl alcohol
Polymer Science U.S.S.R., 1970THE production of linear phosphorus-containing polymers of high mol.wt, is known to "be difficult [1]. Polymer-analogue reactions are quite promising for this purpose, but only where mild conditions are used, and where the reaction does not result in secondary products. These rquirements are met by the acetalation of polyvinyl alcohol (PVA).
L.Kh. Gazizova +4 more
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Polyvinyl alcohol (PVA) is one of the main exploited Water-Soluble Polymers (WSPs), from packaging production to biomedical purposes. However, despite its widespread use, there still seems to be some controversy regarding its chemical safety. In this brief chapter the main knowledge in the PVA (eco)toxicological field is summarized, highlighting how ...
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1992
In 1987, some 1,320 kt PVC were manufactured in the Federal Republic [I]. Allowing for an export trade surplus of PVC moulding compounds (260 kt), PVC semi- finished goods (160 kt) and PVC in finished products or as packaging material (100 kt), approximately 800 kt pure PVC remained in the Federal Republic. All the figures are calculated with reference
Hans Gaensslen, Walter Tötsch
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In 1987, some 1,320 kt PVC were manufactured in the Federal Republic [I]. Allowing for an export trade surplus of PVC moulding compounds (260 kt), PVC semi- finished goods (160 kt) and PVC in finished products or as packaging material (100 kt), approximately 800 kt pure PVC remained in the Federal Republic. All the figures are calculated with reference
Hans Gaensslen, Walter Tötsch
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