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Ultraviolet (UV) light is electromagnetic radiation of wavelengths of 10–400 nanometers, shorter than that of visible light, but longer than X-rays. UV radiation is present in sunlight, and constitutes about 10% of the total electromagnetic radiation output from the
TSMC's N7+ is the first commercially available extreme-ultraviolet lithographic process in the semiconductor industry. It uses ultraviolet patterning and enables more acute circuits to be implemented on the silicon.
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- History
- Chemical and Physical Properties
- Production
- Manufacturing from Polypropylene
- Applications
- Recycling
- Repairing
- Health Concerns
- Combustibility
- External Links
Phillips Petroleum chemists J. Paul Hogan and Robert Banks first demonstrated the polymerization of propylene in 1951. The stereoselective polymerization to the isotactic was discovered by Giulio Natta and Karl Rehn in March 1954. This pioneering discovery led to large-scale commercial production of isotactic polypropylene by the Italian firm Monte...
Polypropylene is in little aspects similar to polyethylene, especially in solution behavior and electrical properties. The methyl group improves mechanical properties and thermal resistance, although the chemical resistance decreases.: 19 The properties of polypropylene depend on the molecular weight and molecular weight distribution, crystallinity...
Polypropylene is produced by the chain-growth polymerization of propene: The industrial production processes can be grouped into gas phase polymerization, bulk polymerization and slurrypolymerization. All state-of-the-art processes use either gas-phase or bulk reactor systems. 1. In gas-phase and slurry-reactors, the polymer is formed around hetero...
Melting process of polypropylene can be achieved via extrusion and molding. Common extrusion methods include production of melt-blown and spun-bond fibers to form long rolls for future conversion into a wide range of useful products, such as face masks, filters, diapers and wipes. The most common shaping technique is injection molding, which is use...
As polypropylene is resistant to fatigue, most plastic living hinges, such as those on flip-top bottles, are made from this material. However, it is important to ensure that chain molecules are oriented across the hinge to maximise strength. Polypropylene is used in the manufacturing of piping systems, both ones concerned with high purity and ones ...
Most polypropylene recycling uses mechanical recycling, as for polyethylene: the material is heated to soften or melt it, and mechanically formed it into new products. As of 2015, less than 1% of polypropylene generated was recycled. Heating degrades the carbon backbone more severely than for polyethylene, breaking it into smaller organic molecules...
PP objects can be joined with a two-part epoxyglue or using hot-glue guns. PP can be melted using a speed tip weldingtechnique. With speed welding, the plastic welder, similar to a soldering iron in appearance and wattage, is fitted with a feed tube for the plastic weld rod. The speed tip heats the rod and the substrate, while at the same time it p...
The advocacy organization Environmental Working Group classifies PP as of low to moderate hazard.[why?]PP is dope-dyed; no water is used in its dyeing, in contrast with cotton.
Like all organic compounds, polypropylene is combustible. The flash point of a typical composition is 260 °C; autoignition temperatureis 388 °C.
UV is the lowest energy range energetic enough to ionize atoms, separating electrons from them, and thus causing chemical reactions. UV, X-rays, and gamma rays are thus collectively called ionizing radiation; exposure to them can damage living tissue. UV.
The double sovereign is a gold coin of the United Kingdom with a nominal value of two pounds sterling (£2). It features the reigning monarch on its obverse and, most often, Benedetto Pistrucci 's depiction of Saint George and the Dragon on the reverse (pictured). It was rarely issued in the first century and a half after its debut in 1820 ...
Germany,[e] officially the Federal Republic of Germany (FRG),[f] is a country in the western region of Central Europe. It is the second-most populous country in Europe after Russia[g] and the most populous member state of the European Union. Germany lies between the Baltic and North Sea to the north and the Alps to the south. Its 16 ...
Formaldehyde ( / fɔːrˈmældɪhaɪd / ⓘ for-MAL-di-hide, US also / fər -/ ⓘ fər-) ( systematic name methanal) is an organic compound with the chemical formula CH2O and structure H−CHO, more precisely H2C=O. The compound is a pungent, colourless gas that polymerises spontaneously into paraformaldehyde.
