Polietileno – Polyethylene – Wikipedia

Polietileno

Definición de polietileno en el Diccionario de español en línea. Significado de polietileno diccionario. traducir polietileno significado polietileno traducción de polietileno Sinónimos de polietileno, antónimos de polietileno. Información sobre polietileno en el Diccionario y Enciclopedia En Línea Gratuito. s. m. QUÍMICA Sustancia plástica, sólida y traslúcida, …

Ultra-high-molecular-weight polyethylene UHMWPE [ edit ] Main article: Ultra-high-molecular-weight polyethylene Stainless steel and ultra high molecular weight polyethylene hip replacement UHMWPE is polyethylene with a molecular weight numbering in the millions, usually between 3. Because of its outstanding toughness and its cut, wear, and excellent chemical resistance, UHMWPE is used in a diverse range of applications.

These include can- and bottle -handling machine parts, moving parts on weaving machines, bearings, gears, artificial joints, edge protection on ice rinks, steel cable replacements on ships, and butchers’ chopping boards. It is commonly used for the construction of articular portions of implants used for hip and knee replacements.

As fiber , it competes with aramid in bulletproof vests. The white outer layer is co-extruded to provide a reduction of thermal heating, known as Acu-Therm. HDPE is defined by a density of greater or equal to 0. HDPE has a low degree of branching. These catalysts prefer the formation of free radicals at the ends of the growing polyethylene molecules. They cause new ethylene monomers to add to the ends of the molecules, rather than along the middle, causing the growth of a linear chain.

HDPE has high tensile strength. It is used in products and packaging such as milk jugs, detergent bottles, butter tubs, garbage containers, and water pipes. One-third of all toys are manufactured from HDPE. The high-temperature properties of the polymer are improved, its flow is reduced, and its chemical resistance is enhanced.

PEX is used in some potable-water plumbing systems because tubes made of the material can be expanded to fit over a metal nipple and it will slowly return to its original shape, forming a permanent, water-tight connection. MDPE has good shock and drop resistance properties.

MDPE is typically used in gas pipes and fittings, sacks, shrink film, packaging film, carrier bags, and screw closures. LLDPE is a substantially linear polymer with significant numbers of short branches, commonly made by copolymerization of ethylene with short-chain alpha-olefins for example, 1-butene , 1-hexene , and 1-octene. Lower-thickness gauge films can be blown, compared with LDPE, with better environmental stress cracking resistance, but they are not as easy to process.

LLDPE is used in packaging, particularly film for bags and sheets. Lower thickness may be used compared to LDPE. It is used for cable coverings, toys, lids, buckets, containers, and pipe. While other applications are available, LLDPE is used predominantly in film applications due to its toughness, flexibility, and relative transparency. Product examples range from agricultural films, Saran wrap, and bubble wrap to multilayer and composite films. LDPE has a high degree of short- and long-chain branching, which means that the chains do not pack into the crystal structure as well.

It has, therefore, less strong intermolecular forces as the instantaneous-dipole induced-dipole attraction is less. LDPE is created by free-radical polymerization. The high degree of branching with long chains gives molten LDPE unique and desirable flow properties. LDPE is used for both rigid containers and plastic film applications such as plastic bags and film wrap. In HDPE synthesis, the radical sites are at the ends of the PE chains, because the catalyst stabilizes their formation at the ends.

Addition of ethylene monomers to the secondary or tertiary sites creates branching. VLDPE is a substantially linear polymer with high levels of short-chain branches, commonly made by copolymerization of ethylene with short-chain alpha-olefins for example, 1-butene, 1-hexene and 1-octene.

VLDPEs are used for hose and tubing, ice and frozen food bags, food packaging and stretch wrap as well as impact modifiers when blended with other polymers. Recently, much research activity has focused on the nature and distribution of long chain branches in polyethylene.

In HDPE, a relatively small number of these branches, perhaps one in or 1, branches per backbone carbon, can significantly affect the rheological properties of the polymer.

Copolymers[ edit ] In addition to copolymerization with alpha-olefins, ethylene can be copolymerized with a wide range of other monomers and ionic composition that creates ionized free radicals. Common examples include vinyl acetate the resulting product is ethylene-vinyl acetate copolymer , or EVA, widely used in athletic-shoe sole foams and a variety of acrylates.

Applications of acrylic copolymer include packaging and sporting goods, and superplasticizer , used in cement production. Types of polyethylenes[ edit ] The particular material properties of “polyethylene” depend on its molecular structure.

The less the polymer chains are branched, and the lower the molecular weight, the higher the crystallinity of polyethylene. Polyethylene has a density of 1. The polymer chains are represented linearly. Chain branches[ edit ] The properties of polyethylene are highly dependent on type and number of chain branches.

The chain branches in turn depend on the process used: either the high-pressure process only PE-LD or the low-pressure process all other PE grades. Low-density polyethylene is produced by the high-pressure process by radical polymerization, thereby numerous short chain branches as well as long chain branches are formed. Short chain branches are formed by intramolecular chain transfer reactions, they are always butyl or ethyl chain branches because the reaction proceeds after the following mechanism:.

Polietileno – significado de polietileno diccionario

Definición de polietileno en el Diccionario de español en línea. Significado de polietileno diccionario. traducir polietileno significado polietileno traducción de polietileno Sinónimos de polietileno, antónimos de polietileno. Información sobre polietileno en el Diccionario y Enciclopedia En Línea Gratuito. s. m. QUÍMICA Sustancia plástica, sólida y traslúcida, …

https://es.thefreedictionary.com/polietileno

Polietileno: para qué sirve en la industria Aceromafe

Polietileno de alta densidad (PEAD o HDPE) Tiene una densidad mayor o igual a 0,941 g/cm3, con gran tenacidad y rigidez para el proceso de soplado y extrusión. Los de mayor uso en la industria son los siguientes : HD – Polietileno de alta densidad; HMW – Polietileno de alto peso molecular; UHMW – Polietileno de ultra alto peso molecular

https://www.aceromafe.com/que-es-el-polietileno/

Polyethylene – Wikipedia

The first industrially practical polyethylene synthesis (diazomethane is a notoriously unstable substance that is generally avoided in industrial application) was again accidentally discovered in 1933 by Eric Fawcett and Reginald Gibson at the Imperial …

https://en.wikipedia.org/wiki/Polyethylene

polietileno translation English Spanish dictionary Reverso

Polietileno

Están fabricadas en polietileno y son superresistentes gracias al espesor extra.: They are made of polyethylene and are extra super-resistant due to the thickness.: Plástico de polietileno se utiliza principalmente en la construcción de abastecimiento de agua y drenaje, sanitarios.: Polyethylene plastic is mainly used in the construction of water supply and drainage, sanitary …

https://dictionary.reverso.net/spanish-english/polietileno

polietileno – Diccionario Inglés-Español WordReference.com

polietileno – Traduccion ingles de diccionario ingles. Principal Translations: Spanish: English: polietileno nm nombre masculino: Sustantivo de género exclusivamente masculino, que lleva los artículos el o un en singular, y los o unos en plural. Exemplos: el televisor, un piso.

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Polietileno Textos Científicos

Polietileno

El polietileno (PE) es un material termoplástico blanquecino, de transparente a translúcido, y es frecuentemente fabricado en finas láminas transparentes. Las secciones gruesas son translúcidas y tienen una apariencia de cera. Mediante el uso de colorantes pueden obtenerse una gran variedad de productos coloreados. Por la polimerización de etileno pueden obtenerse productos

http://www.textoscientificos.com/polimeros/polietileno

¿Qué es Polietileno? » Su Definición y Significado [2021]

El polietileno de baja densidad se produjo por primera vez en 1933 en Inglaterra por Imperial Chemical Industries Ltd. (ICI) durante los estudios de los efectos de las presiones extremadamente altas sobre la polimerización del polietileno. ICI se concedió una patente en su proceso en 1937 y comenzó la producción comercial en 1939.

https://conceptodefinicion.de/polietileno/

Polyethylene – Wikipedia

The first industrially practical polyethylene synthesis (diazomethane is a notoriously unstable substance that is generally avoided in industrial application) was again accidentally discovered in 1933 by Eric Fawcett and Reginald Gibson at the Imperial Chemical Industries (ICI) works in Northwich, England. Upon applying extremely high pressure (several hundred atmospheres) to …Abbreviations: PE

https://en.wikipedia.org/wiki/Polyethylene

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