Copolymers ethylene/vinyl chloride

The synthesis of ADMET CPE started with the isolation of the symmetrical chlorine functionahzed a,co-diene. Upon polymerization with [Ru] followed 

A family of ADMET model copolymers were synthesized and used to study the effects of regular microstructure on polymer properties, in particular functionahzed polyethylenes. The structure-property relationships of various ethylene copolymers can be clarified using these model systems. This is illustrated in Fig. 3 by the relationship of to functional group size. Future studies on these and similar systems should lead to fundamental discoveries concerning the class of materials known as polyethylenes and their physical properties. 

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Bowmer and Tonelli [161] have also studied the thermal characteristics of the whole range of ethylene-vinyl chloride copolymers prepared by partial reductive dechlorination of PVC using tri-n-butyltin-hydride. Naqvi [162] has substantiated further his explanations for the thermal stability characteristics of ethylene-vinyl chloride copolymers reported by Braun et al. [159] using the results of Bowmer and Tonelli [161] as a basis. 

RIS theory is used to calculate mean-square unperturbed dimensions 0 and dipole moments

of ethylene-vinyl chloride copolymers as a function of chemical composition, chemical sequence distribution, and stereochemical composition of the vinyl chloride sequences. As was previously found for several other copolymeric chains, is much more sensitive to chemical composition and chemical sequence distribution than is 0. The present calculations also indicate that both and are most strongly dependent on chemicel sequence distribution for ethylene-vinyl chloride chains having vinyl chloride sequences which are significantly syndiotactlc in structure. 

AIRFLEX Ethylene-Vinyl Chloride Copolymers(Continued) AIRFLEX TL-68 ... 

Ethylene-vinyl acetate polymer Ethylene-vinyl chloride Ethylene-vinyl chloride copolymer Fatty acid amide Fatty acid amides Fatty acid amine and silicone blend... 

Magnetic tapes are usually coated with coatings from solvents, such as methyl ethyl ketone, methyl isobutyl ketone, and toluene. Aqueous replacements can eliminate all or nearly all of the solvents.352 One system used iron oxide in a blend of a polyurethane and ethylene-vinyl chloride copolymer emulsions thickened with hydroxyethyl cellulose, which was cross-linked with a melamine-formaldehyde resin. Coating was done at line speeds of 100 m/min. The whole system proved to be 15% cheaper than coating from solvent. In another system, traces of methanol are evolved on drying and would have to be captured. This replaces a line where 600 kg/h of solvent would have to be recovered and recycled. 

Comb polymer with a poly(methacrylic acid) backbone and polyacrylonitrile side chains Comb polymer with unspecified backbone composition and statistical ethylene/vinyl chloride copolymer side chains... 

Chem. Descrip. Ethylene-vinyl chloride copolymer latex Uses Coating binder and saturant for paper and paperboard applies. binder for flame retardant fabrics, heat sealable nonvirovens useful in heat seal adhesive appiics. or where a moisture barrier is required binder for nonwovens and textiles imparts flexibility and water resist, to caulks, mastics, barrier coats in building applies., low MTVR coalings Features Inherently flame retardant... 

Vinyl acetate-acrylic copolymer. See Acrylates/VA copolymer Vinyl acetate/ethylene copolymer. See Ethylene/VA copolymer Vinyl acetate-ethylene-vinyl chloride copolymer. See Vinyl acetate/ethyl-ene/vinyl chloride terpolymer... 

Synonyms Vinyl acetate-ethylene-vinyl chloride copolymer Vinyl chlo-ride/ethylene vinyl acetate copolymer Uses Binder, vehicle for emulsion paints, paper coatings, textured finishes, fabric coatings, flame retardant fabrics, constmction adhesives, and thermal insulation systems adhesive for flooring, walls, foam, tiles, paper/paperboard binder for fabrics, glass fiber textile auxiliary and coating paper coatings... 

Vinyl acetate-ethylene-vinyl chloride copolymer. See Vinyl acetate/ethylene/vinyl chloride terpolymer... 

It is often desirable to perform some kind of chemical modification to polymers once they have formed. Acetylation of cellulose, for example, represents the chemical modification of a naturally occurring polymer (see chapter 3) to give the technologically useful cellulose diacetate and triacetate polymers. Poly(vinyl alcohol) (PVA) is a well-known example of a polymer that can only be formed by chemical modification since vinyl alcohol monomer does not exist (except as its keto form, acetaldehyde). Instead, PVA is formed by hydrolysis of poly(vinyl acetate) (PVAc). Partly hydrolysed PVAc is, of course, simply a copolymer of VA and VAc. As another example, ethylene/vinyl chloride copolymers can be prepared by reductive elimination of chlorine from poly (vinyl chloride) (PVC). The driving force here is that, although ethylene and vinyl chloride can be copolymerised directly, the normal routes to these polymers give insufficient control over composition and sequence distribution. 

Pourahmady, N., Bak, P.I. and Kinsey, R.A. (1992) Microstructure and thermal properties of ethylene-vinyl chloride copolymers. Journal of Macromolecular Science-Pure and Applied Chemistry 29,959-974. 

Bowmer, T.N. and Tonelli, A.E. (1985) Thermal transitions of ethylene-vinyl chloride copolymers, Polymer 26,1195-1201. 

Gomez, M.A, Tonelli, AK, Lovinger, AJ., Sdiilling, F.C., Cozine, M.H., Davis, D.D., Structure and morphology of ethylene-vinyl chloride copolymers. Macromolecules 1989,22 4441 51. 

The melting temperature-composition relations for ethylene-vinyl chloride copolymers are virtually identical to those for ethylene-propylene copolymers [94]. Hence we can also surmise that the Cl atom enters the lattice on an equilibrium basis. Results of similar studies have shown that smaller side groups such as CH3, Cl, OH, and O can enter the lattice of ethylene copolymers [95]. 

Fig. 2. 60 MHz NMR spectra [70] of ethylene-vinyl chloride copolymers A 50 mole %...

Phosphoric acid, at the same concentration as the sulfuric acid, did not produce water resistant panels with about 10% phenol monomer. However, incorporating about 3 weight percent of a water proofing ethylene/vinyl chloride copolymer (Monflex 4530 latex) gave water resistant pressed panels (Table 3). ... 

As in the phenolic samples, the addition of about 3 weight percent of ethylene/vinyl chloride copolymer (Monflex 4530) into the formulation appeared to significantly improve water resistance of samples containing the lower (7 weight percent) concentrations of melamine. The ethylene/vinyl chloride copolymer alone (no melamine) did not produce water resistant panels (Table 4). 

Phosphoric acid hydrolyzed bagasse reacted with melamine also yielded samples with inferior water resistance, unless 3 weight percent ethylene/vinyl chloride copolymer emulsion was added into the formulation (Table 5). 

The in-situ generation of urea bonding resin was evaluated using phosphoric acid only with and without incorporation of ethylene/vinyl chloride copolymer into the formulation. At the same or higher monomer concentration, the in-situ generated urea... 

Laser Raman spectroscopy has been proposed as a useful technique for probing the microstructure of copolymers. Good correlations were found between the concentrations of some isolated, dyad, triad and tetrad comonomer sequences in vinyl chloride/vinylidene chloride copolymers and certain scattering intensities [99]. The positions and intensities of particular absorption bands have also been correlated with chain microstructure in an infrared study of ethylene/vinyl chloride copolymers, previously characterised by C-NMR analysis [100]. More recently, FTIR spectra have been analysed for monad, dyad and triad monomer sequence-distribution dependencies in random styrene/acrylonitrile copolymers [101]. Changes in peak intensities from normalised spectra were correlated with microstructure probabilities assignments were given if there existed a linear relationship between peak intensity and the number fraction of a microstructure. 

Tough, flexible Ethylene-vinyl chloride copolymer United States 2,497,291 1950 Dupont... 

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