Results 281 to 290 of about 23,945 (314)
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Factors affecting hydrolysis of polyvinyl acetate to polyvinyl alcohol
Journal of Environmental Chemical Engineering, 2019Abstract This study provides additional insight into the effects of different operating parameters on the degree of hydrolysis of PVA with the presence of sodium hydroxide.
S. Aruldass +3 more
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Separation of Polyvinyl Chloride and Polyvinyl Acetate by Chromatographic Methods
Nature, 1959THE material used in this work was known to contain at least two co-polymers. A method of separation was sought which would not require a complex chemical procedure. The separation of high polymers by chromatographic means was carried out by Claesson1, while separations on columns packed with carbon black were attempted by Landler2.
D. J. Vaughan, W. J. Langford
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Relaxation transitions in polyvinyl alcohol and porous polyvinyl formals
Inorganic Materials: Applied Research, 2017Relaxation phenomena in polyvinyl alcohol and polyvinyl formal are studied. The internal friction spectra acquired in a free-damped torsional vibrations mode and temperature range from–150 to 120°C of two test samples each contained two distinct loss peaks, designated as α and γ, and weakly expressed β peaks.
O. A. Khlebnikova +4 more
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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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Mineralization of radiation‐crosslinked polyvinyl alcohol/polyvinyl pyrrolidone hydrogels
Journal of Biomedical Materials Research Part A, 2007AbstractA study of the calcification of the polyvinyl alcohol/polyvinyl pyrrolidone (PVA/PVP) hydrogels during their exposure to a calcium chloride solution or a simulated body fluid has been carried out. On the basis of the experiments, using a two‐compartment permeation cell, the diffusion of calcium ions and their subsequent deposition in the ...
Zainuddin, Hill, DJT, Whittaker, AK
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Extraction fractionation of polyvinyl acetate and of polyvinyl alcohol
Journal of Polymer Science, 1959AbstractMethods for rapid fractionation of polyvinyl acetate and of polyvinyl alcohol are described. By a slightly modified Fuchs' extraction technique, polyvinyl acetate can be fractionated into relatively homogeneous fractions. The ratio of osmotically determined M̄n of the nonfractionated sample to that calculated from fractionation data is 1.19 ...
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2012
This chapter focuses on polymers made from monomers that contain a carbon–carbon double bond through which the polymer is made by addition polymerization. This chapter does not include those containing only carbon and hydrogen. Chemical structures of monomer and polymers, manufacturers and trade names along with typical end uses of the plastics are ...
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This chapter focuses on polymers made from monomers that contain a carbon–carbon double bond through which the polymer is made by addition polymerization. This chapter does not include those containing only carbon and hydrogen. Chemical structures of monomer and polymers, manufacturers and trade names along with typical end uses of the plastics are ...
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1995
Publisher Summary This chapter opens with a general discussion on various joining techniques in Georgia Gulf rigid vinyl compounds. Parts molded from Georgia Gulf rigid vinyl compounds can be fastened together in a variety of ways. Whether the methods are through mechanical or chemical means, consideration early in the design stages facilitates a ...
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Publisher Summary This chapter opens with a general discussion on various joining techniques in Georgia Gulf rigid vinyl compounds. Parts molded from Georgia Gulf rigid vinyl compounds can be fastened together in a variety of ways. Whether the methods are through mechanical or chemical means, consideration early in the design stages facilitates a ...
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Miscibility of Some Polycarbonates with Polyvinyl Chloride and Chlorinated Polyvinyl Chloride
Journal of Thermal Analysis and Calorimetry, 2000The phase behavior of several polycarbonate homopolymers and copolymers blended with PVC and chlorinated PVCs (CPVCs) has been investigated. Tetrachlorobisphenol-A polycarbonate (TCPC) is miscible in all proportions with PVC and CPVCs containing up to70.2 wt% chlorine.
J. T. Neill, F. E. Karasz
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Polyvinyl alcohol and modified polyvinyl alcohol reverse osmosis membranes
Desalination, 1993Abstract A study was conducted on the insolubilization of polyvinyl alcohol. Polyvinyl alcohol was regarded as a stable material for the formation of gel layer base membranes, which could then be further modified to produce RO membranes with good salt retention.
Sanderson R.D. +4 more
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