Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Polyethylene-co- vinyl acetate

The CYPHER stent employs two nonerodible polymers polyethylene-co-vinyl acetate (PEVA) and poly-n-butyl methacrylate (PBMA), The combination of sirolimus and these two polymers constitutes the basecoat formulation that is applied to a stent treated with paryleneC. In addition, a drug-free topcoat of PBMA polymer is applied to control the release kinetics of sirolimus (59), making this a diffusion-controlled reservoir device. The chemical structure of the polymers used in the CYPHER stent is shown in Figure 4,... [Pg.272]

Polymers used in the CYPHER sirolimus-eluting stent. Abbreviations PBMA, poly-n-butyl methacrylate PEVA, polyethylene-co-vinyl acetate. [Pg.272]

See color plate) Strut-associated inflammation in response to the polyethylene-co-vinyl acetate—poly-n-butyl methacrylate polymers in porcine and canine models at two months. Source Adapted from Ref. 60. [Pg.273]

Figure 6. Semilogarithmic correlation of the solubility (C ) of a series of steroids in polyethylene-co-vinyl acetate, 40% vinyl acetate, and the steroid melting point. Data from Ref. 20. Figure 6. Semilogarithmic correlation of the solubility (C ) of a series of steroids in polyethylene-co-vinyl acetate, 40% vinyl acetate, and the steroid melting point. Data from Ref. 20.
Log P (Polymer) for Poly(dimethylsiloxane), Polyethylene -co-vinyl acetate), 40 VA, Poly(e-caprolactone), and Poly(e-caprolactam-co-e-caprolactone)... [Pg.65]

It is also possible to extrude ceramic nanopowders with thermoplastic binder systems. Scheying et. al., for example, investigated the extrusion of monoclinic zirconia nanopowder [Schey 04]. The powder loadings achieved in the feedstocks were 44 and 53 vol% when using powders with primary particle sizes of 9 and 25 nm, respectively. The binder system used consisted of either polyethylene-co-vinyl acetate or polyethylene as the major component and decanoic acid as a surfactant. [Pg.329]

CF/PEEK carbon fiber-reinforced polyetheretherketone PEVA pHEMA polyethylene-co-vinyl acetate poly(2-hydroxyethyl methacrylate)... [Pg.309]

A handful of drugs have been studied in DES, such a paclitaxel, sirolimus, and its related family members (zotarolimus, biolimus A9, and everolimus). Many polymeric materials such as polylactic acid (PLA), polyethylene-co-vinyl acetate (PEVA), poly(styrene-b-isobutylene-b-styrene) (SIBBS), poly-L-lactic acid (PLLA), phosphorylcholine (PC), and poly-n-butyl methacrylate (PBMA), were used for drug coatings, all of which are unique to each class of DES. [Pg.412]

The cable industry has been struggling to move away from halogen flame retardant compoimds without too much loss of mechanical properties. Nanofillers are an attractive option if sufficient flame retardancy can be achieved. Kabelwerk Eupen manufactures flame retardant cable jacketing using polyethylene co-vinyl acetate containing 5% of nanoclay from Siid-Chemie. [Pg.112]

A linear change of free sirrface energy on the composition of the blend was observed in some cases but usually the dependence on the composition of the blend is more complicated. The free surface energy of the polymer blends depends primarily on the amount of polymeric components and on their free surface energies. A rather common feature is a phenomenon of excess free surface energy resulting from a preferential accumulation of one pol5oneric component in the surface layer of the matrix polymer. This effect was observed, for example, for the blends of PP with polyethylene-co-vinyl acetate or polyethylene-co-acrylic acid. [Pg.792]

Copolymers. If different segments of the copolymer chain have different thermal stabilities, it is possible to quantitatively analyze certain polymers by TGA. The classical example is the polyethylene-co-(vinyl acetate) polymer or EVA. When EVA is thermally degraded in an inert atmosphere, the first product emitted at about 350°C is acetic acid. The rest of the hydrocarbon chain decomposes at a higher temperature (430°C). This is shown in Figure 20 (Ref 5, p. 870). The weight loss at 350°C corresponds to the amount of vinyl acetate present in the copolymer. [Pg.8340]

APTMOS 3-amino-propyl-trimethoxysilane, AuHFA fluoroalcohol-coated gold nanospheres, BBCB bisbenzocy-clobutene, BCB benzocyclobutene, CA cellulose acetate, CAB cellulose acetate-butyrate, CEE chloroethyl ether, DIMP diisopropyl methylphosphonate, DMMP dimethyl methylphosphonate, EPR epoxidized novolac, IPA isopropanol, OV-225 cyanopropyl methyl phenylmethyl silicone, OV-275 dicyanoallyl sihcone, PAAM polyallylamine hydrochloride, PAPPS propylaminopropyl polysiloxane, PDMS poly(dimethylsiloxane), PECH polyepichlorohydrin, PEG polyethylene glycol, PEI polyethyleneimine, PEO polyethylene oxide, PEVA polyethylene-co-vinyl acetate, PEUT poly(ether urethane), PHEMA poly(2-hydroxyethyl methacrylate), PIB polyisobutylene, PMMA poly(methyl methacrylate), PTMOS propyltrimethoxysilane, PVA polyvinyl alcohol, PVP polyvinylpyrrolidone, SXFA siloxanefluoroalcohol... [Pg.368]

P Uses a tubular electrode based on the redox properties of copper(II) ions occluded in polyethylene-co-vinyl acetate (EVA ) membrane 850 120 3.6 Pharmaceuticals 2000 200... [Pg.322]

Polyethylene-co-vinyl Acetate (PEVA) and Poly n-butyl Methacrylate (PBMA)... [Pg.352]

Cypher is a first-generation DES that releases the immxmosuppressive agent siroli-mus (brand name Rapamxme) which is bound to polymers embedded in this stent. The Cypher system has a stainless steel base which is cut into a sinusoid shape and is coated with a blend of two polymers. The blended polymers are polyethylene-co-vinyl acetate (PEVA) and poly n-butyl methacrylate (PBMA). A combination of the two polymers mixed with sirolimus (67%/33%) makes up the basecoat formulation. Another coat of... [Pg.352]

Besides water-soluble polymers, more synthetic polymers are insoluble in water and should be dissolved in organic solvent for electrospinning, such as polylactic-co-glycolic acid (PLLA), PCL, polybutylene succinate-co-butylene terephthalate (PBST), polyhydroxyalkanoates (PHA), polybutylene succinate (PBS), PAN, poly-sulfone (PSF), polyimide (PI), polyethylene-co-vinyl alcohol (PEVA), PU, polypyrrole (PPy), polyoxymethylene (POM), PS, polymethyl methacrylate (PMMA), PVC, polyvinylidene fluoride (PVDF), polytrimethylene terephthalate (PTT), polybutylene terephthalate (PBT), poly A-vinylcarbazole (PVK), polymeta-phenylene isophthalamide (PMIA), polyethylene terephthalate (PET), polycarbonate (PC), polybenzimidazole (PBI), polymer vinyl acetate (PVAc), polyvinyl butyral (PVB), and polyethylene-co-vinyl acetate (PEV). [Pg.21]

Ethylene can be readily copolymerized at high pressure with a variety of vinyl ester comonomers. From a commercial standpoint, vinyl acetate is the most important. Polyethylene-co-vinyl acetate is better known as ethylene-vinyl acetate copolymer and is customarily referred to as EVA. The structure of the vinyl acetate branch is shown in Figure 8. [Pg.406]

Formulation-designed hot melt adhesives use a number of materials as the base polymer for the formulation. The most widely used material for this type of adhesive is polyethylene-co-vinyl acetate (EVA). Other materials used are polyethylene (low density), block copolymers (styrene-iso-prene-styrene), phenoxy resins, polypropylene, and paraffin waxes. Paraffin, the oldest hot melt adhesive, was used as a sealing wax. As with PSAs, tackifiers are also added to hot melt adhesives to lower their melt viscosity as well as to provide tack during the resolidification of the adhesive. If one examines some hot melt adhesive formulations, one finds that the tackifier is a primary component of the adhesive sometimes used to the same level or possibly in excess of the hase polymer. Another component is the addition of a wax. The wax is added not only to decrease the melt viscosity of the adhesive but also to aid in the recrystallization process. As one might be able to recount from statements made above about heat stability, an antioxidant is an important additive to hot melt adhesive formulations. Final additives indude colorants and fillers. [Pg.310]


See other pages where Polyethylene-co- vinyl acetate is mentioned: [Pg.266]    [Pg.314]    [Pg.317]    [Pg.711]    [Pg.312]    [Pg.489]    [Pg.136]    [Pg.416]    [Pg.101]    [Pg.406]   
See also in sourсe #XX -- [ Pg.282 ]

See also in sourсe #XX -- [ Pg.416 ]




SEARCH



Acetic Co

Polyethylene vinyl acetate)

© 2024 chempedia.info