Polyvinyl polymers

Fig. 4.16 provides an illustration of the adsorption of a neutral polymer, polyvinyl alcohol, on a polar surface, and the resulting effects on the double layer properties. Adsorption of anionic polymers on negative surfaces - especially in the presence of Ca2+ or Mg2+ which may act as coordinating links between the surface and functional groups of the polymer - is not uncommon (Tipping and Cooke, 1982). 

Vinyl Acetate—Ethylene Copolymers. In these random copolymers, the ratio of ethylene to vinyl acetate (EVA) is varied from 30—60%. As the vinyl acetate content increases, the oil and heat resistance increases. With higher ethylene content the physical strength, tensile, and tear increases. The polymers are cured with peroxide. The main properties of these elastomers include heat resistance, moderate oil and solvent resistance, low compression set, good weather resistance, high damping, excellent ozone resistance, and they can be easily colored (see Vinyl polymers, polyvinyl acetate)). 

R.R. Clikeman, D.H. Jones, T.J. Shortridge, and E.J. Troy, Methyl methacrylate-butadiene-styrene impact modifier polymers, polyvinyl chloride, compositions and methods, US Patent 4 379 876, assigned to Rohm and Haas Company (Philadelphia, PA), April 12,1983. 

Vinyl chloride (VC) is the monomer from which the common polymer, polyvinyl chloride, is produced. Hence, VC is produced on a very large scale. Not surprisingly, occasional releases of the rather toxic VC to the environment occur. What initial biodegradation product would you expect from VC if it were released into an oxic environment ... 

There are a number of examples of systems in which species firmly attached to sites can react with one another. The reaction is usually confined to groups that occupy adjacent sites. A classic example of such a system is the polymer, polyvinyl chloride, whose structure is... 

The principal members of this class are polyvinyl alcohol, ethylene oxide polymers, polyvinyl pyrrolidone, polyethyleneimine. 

Chloroethene is produced in vast quantities for the production of polymers (polyvinyl chloride) and copolymers ... 

High speed stirring has be claimed by Nozaki for giving block copolymers from polymer-monomer mixtures (775). Among the polymers which have been subjected to such a degradation are addition polymers (polyvinyl chloride, polystyrene, polyacrylamide) as well as cellulose derivatives, phenol-formaldehyde linear condensation products and polyethylene terephthalate. 

Write the reaction for the polymerization of vinyl chloride (chloroethene). Show the repeating unit of the resulting polymer (Polyvinyl chloride, PVC). 

The various ingredients in the new detergent are microencapsulated in coatings which ensure that they release their chemicals at the right time, and the whole 25 gram of detergent is sealed in a water-soluble polymer, polyvinyl alcohol, which is also produced from plant materials. 

Vinyl chloride is used in the production of polymer (polyvinyl chloride), for use in plastics. It is classified as a human carcinogen (EPA Group A). 

As a binder system polymers are utilized. If the binders contain energy or gas-producing molecular groups (-N02, -N3), one classifies the binders as Active Binders (e.g. polynitropolyphenylene, glycidyl azide polymer, polyvinyl nitrate and nitrocellulose). If these substances are not present, then the binders are classified as inert binders. Depending on available processing methods, binder types such as thermoset material, thermoplast or gelatinizers can be used. They can then be formed and cured by chemical or physical means. 

A direct relation between the polymer foams density (respectively, the expansion ratio) and the oligomer content in it has been established [114], Addition of water soluble polymers (polyvinyl alcohol, carboxymethyl cellulose, etc.) led to a reduction in resin consumption without deteriorating the quality of the solid foam obtained. Polymer foams of density 5-7 kg m3 were produced when the oligomer consumption was not more than 15-20% with respect to the solution volume. 

Polymers more commonly used in CIJ Solvent Inkjet formulations include, nitrocellulose, acryhcs, cellulose acetate but)rrate, vinyl chloride co-polymers, polyvinyl butyrate, etc. ... 

The first organic polymers, polyvinyl chloride and polystyrene, were first introduced in the 1930s. We have been literally surrounded by synthetic polymers for a long time. The world annual production of polymers is approximately 200 x 109 kg. In the... 

The existence of these metal-oxygen-carbon complexes can account for many of the observed changes already discussed. We expect the metal to be more tightly banded to the polymer (polyvinyl alcohol) through such a complex than if one was not present,... 

Another high-volume polymer, polyvinyl chloride (PVC), is constructed from the monomer vinyl chloride,... 

Qlhe polymer polyvinyl chloride is commonly called "vinyl." it is used to make flexible, waterproof objects. o Polystyrene plastic is inexpensive and easy to mold into parts for model cars and airplanes. 

The interaction between SDS and a more hydrophobic polymer, polyvinyl pyrrolidone, has been studied by 13C NMR spectroscopy. The results suggest a model similar to the polyethylene oxide-SDS system, in that the polymer molecules are wrapped around the surfactant aggregate.276 All the carbon atoms of the surfactant except the one closest to the head group undergo l3C chemical-shift changes that are accounted for on the basis of a change in the distribution of... 

Chemical Resistance - Acrylate Styrene Acrylonitrile Polymer / Polyvinyl Chloride Alloy... 

Nonionic polymers Polyvinyl alcohol (with polyvinyl acetate blocks, usually... 

In this MiniLab, you will work with a polymer, polyvinyl alcohol. A polymer is a large molecule that consists of a chain of smaller repeating emits. By allowing polyvinyl alcohol to react with a borax solution, you will cross-link polymer molecules to form a gel not imlike the commercial green stuff you may have seen. You can then investigate some of the properties of the gel. 

Because the stereoregular synthetic rubbers are the subject of a separate chapter, this discussion will be concerned only with the polyolefins. Although the newer and more exciting members of this family are stereoregular polyolefins, the first member (high-pressure polyethylene) is not a stereoregular polymer moreover, the first synthetic stereoregular polymer (polyvinyl isobutyl ether) is not even a polyolefin. 

The polymer polyvinyl chloride (PVC) is soluble in the solvent cyclohexanone. At 25 C it is found that if a solution with 2 g of a specific batch of PVC per liter of solvent is placed, in an... 

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