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6PPD-quinone
6PPD is an organic chemical widely used as stabilising additive (or antidegradant) in rubbers, such as NR, SBR and BR; all of which are common in vehicle tires. Although it is an effective antioxidant it is primarily used because of its excellent antiozonant peformance. It is one of several antiozonants based around ''p''-phenylenediamine (PPD). Manufacturing 6PPD is prepared by reductive amination of methyl isobutyl ketone with 4-aminodiphenylamine. This produces a racemic mixture. Application 6PPD is a common rubber antiozonant, with a major application in vehicle tires. It is mobile within the rubber and is slowly forced to the surface via blooming. Here it forms a "scavenger-protective film", reacting with the ozone more quickly that the ozone can react with the rubber. This process initially forms aminoxyl radicals and was thought to stop at the quinone diimine, but is now known to continue to form quinones, amongst other products. Despite 6PPD being used in tires sinc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
6PPD Ozone-oxidation Overview
6PPD is an organic chemical widely used as stabilising additive (or antidegradant) in rubbers, such as NR, SBR and BR; all of which are common in vehicle tires. Although it is an effective antioxidant it is primarily used because of its excellent antiozonant peformance. It is one of several antiozonants based around ''p''-phenylenediamine (PPD). Manufacturing 6PPD is prepared by reductive amination of methyl isobutyl ketone with 4-aminodiphenylamine. This produces a racemic mixture. Application 6PPD is a common rubber antiozonant, with a major application in vehicle tires. It is mobile within the rubber and is slowly forced to the surface via blooming. Here it forms a "scavenger-protective film", reacting with the ozone more quickly that the ozone can react with the rubber. This process initially forms aminoxyl radicals and was thought to stop at the quinone diimine, but is now known to continue to form quinones, amongst other products. Despite 6PPD being used in tires sinc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Organic Chemical
In chemistry, organic compounds are generally any chemical compounds that contain carbon-hydrogen or carbon-carbon bonds. Due to carbon's ability to catenate (form chains with other carbon atoms), millions of organic compounds are known. The study of the properties, reactions, and syntheses of organic compounds comprise the discipline known as organic chemistry. For historical reasons, a few classes of carbon-containing compounds (e.g., carbonate salts and cyanide salts), along with a few other exceptions (e.g., carbon dioxide, hydrogen cyanide), are not classified as organic compounds and are considered inorganic. Other than those just named, little consensus exists among chemists on precisely which carbon-containing compounds are excluded, making any rigorous definition of an organic compound elusive. Although organic compounds make up only a small percentage of Earth's crust, they are of central importance because all known life is based on organic compounds. Living thing ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coho Salmon
The coho salmon (''Oncorhynchus kisutch;'' Karuk: achvuun) is a species of anadromous fish in the salmon family and one of the five Pacific salmon species. Coho salmon are also known as silver salmon or "silvers". The scientific species name is based on the Russian common name ''kizhuch'' (кижуч). Description During their ocean phase, coho salmon have silver sides and dark-blue backs. During their spawning phase, their jaws and teeth become hooked. After entering fresh water, they develop bright-red sides, bluish-green heads and backs, dark bellies and dark spots on their backs. Sexually maturing fish develop a light-pink or rose shading along the belly, and the males may show a slight arching of the back. Mature adults have a pronounced red skin color with darker backs and average and , occasionally reaching up to . They also develop a large kype (hooked beak) during spawning. Mature females may be darker than males, with both showing a pronounced hook on the nose. Re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rotifer
The rotifers (, from the Latin , "wheel", and , "bearing"), commonly called wheel animals or wheel animalcules, make up a phylum (Rotifera ) of microscopic and near-microscopic pseudocoelomate animals. They were first described by Rev. John Harris in 1696, and other forms were described by Antonie van Leeuwenhoek in 1703. Most rotifers are around long (although their size can range from to over ), and are common in freshwater environments throughout the world with a few saltwater species. Some rotifers are free swimming and truly planktonic, others move by inchworming along a substrate, and some are sessile, living inside tubes or gelatinous holdfasts that are attached to a substrate. About 25 species are colonial (e.g., '' Sinantherina semibullata''), either sessile or planktonic. Rotifers are an important part of the freshwater zooplankton, being a major foodsource and with many species also contributing to the decomposition of soil organic matter. Most species of the r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Washington State University
Washington State University (Washington State, WSU, or informally Wazzu) is a public land-grant research university with its flagship, and oldest, campus in Pullman, Washington. Founded in 1890, WSU is also one of the oldest land-grant universities in the American West. With an undergraduate enrollment of 24,278 and a total enrollment of 28,581, it is the second largest institution for higher education in Washington state behind the University of Washington. It is classified among "R1: Doctoral Universities – Very high research activity". The WSU Pullman campus stands on a hill and is characterized by open spaces and a red brick and basalt material palette—materials originally found on site. The university sits within the rolling topography of the Palouse in rural eastern Washington and remains closely connected to the town and the region. The university also operates campuses across Washington at WSU Spokane, WSU Tri-Cities, and WSU Vancouver, all founded in 1989. In ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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