Ethylene-vinyl acetate copolymer EVA

The selection of ethylene-(vinyl acetate) copolymers is very large [27,31,34,82-85]. It comprises low-molecular-weight waxes, elastomers, and plastomers. One type of EVA has been produced commercially for many years 

It should be noted that PVC-EVA blends are highly sensitive to overmilling this sensitivity is affected by lubricants, stabflizers, fillers, and so on [50]. 

Low-density and high-density PE or PP can be reinforced by the addition of EVA or ethylene-(ethyl acrylate) copolymers [1]. 

Elwax 150 (du Pont de Nemours, U.S.). The vinyl acetate content is 37% by weight its density is 951 kg m sold in small granular form. 

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Ethylene vinyl acetate copolymer (EVA) forms a soft, tacky film with good water-vapor barrier but very poor gas-barrier properties. It is widely used as a low temperature initiation and broad-range, heat-sealing medium. The film also serves for lamination to other substrates for heat-sealing purposes. 

The polyethylene layer shows a series of fault lines that run perpendicular to the direction of applied stress. The fracture surface of the polyethylene is sharp and jagged, and shows no signs of elongation or ductility. Beneath the polyethylene layer "2" was a thin layer ("3") that was identified as ethylene/vinyl acetate copolymer (EVA). The EVA layer did show evidence of ductile failure in the SEM images. 

Ethylene-Vinyl Acetate Copolymer (EVA, EAM) Designation in ISO 1629 - EAM Repeat Unit... 

R. Reed, Moldable Ethylene/Vinyl Acetate Copolymer , USP 4090894 (1978) CA 39, 148908 (1978) [Vinyl acetate copolymerized with ethylene is used as a desensitizer and binder for moldable expl compns of cyclic nitramines such as RDX. From 82 to 98 wt % of binder is used, and various ratios of ethylene to vinyl acetate moieties in the resin are utilized to modify molding and extrusion properties. Prepn of typical compns consists of dissolving the copolymer in benz and addition with stirring to an RDX/w slurry, which is stirred until mixt is complete, followed by filtration and drying. Table 1 presents properties of sample compns with and without the ethylene/vinyl acetate copolymer (EVA). The inventor also states that the EVA, unlike other polymeric binders, endothermically breaks down at high temps and acts as a heat sink for the expl content]... 

Copolymers of ethylene (E) or propylene (P) with acrylic acid (AA) or methacrylic acid (MA) were obtained from SP2 (USA) and used as received (EAA, PAA, PEAA, PMA). Copolymers of ethylene and vinyl alcohol (EVOH) were prepared by hydrolysis (NaOH 0,5M in methanol, reflux, 48 h), of commercial ethylene-vinyl acetate copolymers (EVA, Elf-Atochem) containing 5, 9, 14, and 18 w% of acetate. Hydroperoxides of EPDM based on 5-ethylidene-2-norbornene (0.7 mol Kg 1, Exxon) and polyoctenamer (Vestenamer, VEST, Hiils) resulted from a reaction of polymer films with singlet oxygen. 

At room temperature, PE is a semi-crystalline plastomer (a plastic which on stretching shows elongation like an elastomer), but on heating crystallites melt and the polymer passes through an elastomeric phase. Similarly, by hindering the crystallisation of PE (that is, by incorporating new chain elements), amorphous curable rubbery materials like ethylene propylene copolymer (EPM), ethylene propylene diene terpolymer (EPDM), ethylene-vinyl acetate copolymer (EVA), chlorinated polyethylene (CM), and chlorosulphonated polyethylene (CSM) can be prepared. 

Ethylene/vinyl Acetate Copolymers (EVA). LDPE is easily internally plasticized by copolymerization with increasing amounts (2-20%) of vinyl acetate comonomer. 

Acetic acid, ethylene ester polymer with ethane CoTran-ethylene/vinyl acetate copolymer EVA EVA copolymer EVM poly (ethylene-co-vinyl acetate) VA/ethylene copolymer vinyl acetate/ethylene copolymer. 

In both Europe and the United States, aluminum trihydrate, or ATH [Al(OH)3)], has by far the largest share of the mineral flame-retardant market however, magnesium hydroxide presently has the highest growth rate. To date, most of the research using magnesium hydroxide has focused on thermoplastics, including ethylene-vinyl acetate copolymer (EVA), polypropylene, acrylonitrile-butadiene-styrene (ABS) copolymer, and modified polyphenylene oxide (Hornsby and Watson, 1986). 

In 1968 we reported on the effect of the monomer radical activities on the grafting of various vinyl monomers onto ethylene-vinyl acetate copolymers (EVA) (I). We found that the grafting activity of vinyl monomers corresponds to the monomer radical activity published by Mayo and Walling (2) and others (3, 4). This feature of vinyl monomers is depicted in Figure 1. 

Ethylene vinyl acetate copolymers (EVA) are produced by copolymerizing ethylene and vinyl acetate monomers. 

In more polar substances such as ethylene-vinyl acetate copolymers (EVA), the low molecular weight HALS-I can be used. However, in this substrate too, the polymeric HALS-II and HALS-III are... 

Ocusert provides uniform controlled release (20 or 40 pg/h for 7 days) of pilocarpine as an ocular hypotensive drug and has been commercialized in 1974. Ocusert consists of two outer layers of ethylene-vinyl acetate copolymer (EVA) and an inner layer of pilocarpine in alginate gel within di-(ethylhexyl) phthalate for a release enhancer, sandwiched between EVA layers. ... 

Material Family ETHYLENE VINYL ACETATE COPOLYMER (EVA)... 

Experimental plan. Table 1 presents the experimental plan of this study. High-strength concrete with 25% W/B and incorporating 20% fly ash (FA) and 10% silica fume (SF) was fabricated. A number of trial mixes were performed to secure 700 mm slump flow and 3. 0% air content. For the polymer resin, ethylene vinyl acetate copolymer (EVA-P) and polyvinyl acetate copolymer (PVA-P) powders and PVA (PVA-F) and polypropylene (PP-F) fibers were applied. The dosages ranged from 0.1% to 0.5% for powder-type resins and from 0.05% to 0.15% for fiber-type polymers. 

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