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Poly(p-phenylene Sulfide)
Polyphenylene sulfide (PPS) is an organic polymer consisting of aromatic rings linked by sulfides. Synthetic fiber and textiles derived from this polymer resist chemical and thermal attack. PPS is used in filter fabric for coal boilers, papermaking felts, electrical insulation, film capacitors, specialty membranes, gaskets, and packings. PPS is the precursor to a conductive polymer of the semi-flexible rod polymer family. The PPS, which is otherwise insulating, can be converted to the semiconducting form by oxidation or use of dopants.David Parker, Jan Bussink, Hendrik T. van de Grampel, Gary W. Wheatley, Ernst-Ulrich Dorf, Edgar Ostlinning, Klaus Reinking, "Polymers, High-Temperature" in Ullmann's Encyclopedia of Industrial Chemistry 2002, Wiley-VCH: Weinheim. Polyphenylene sulfide is an engineering plastic, commonly used today as a high-performance thermoplastic. PPS can be molded, extruded, or machined to tight tolerances. In its pure solid form, it may be opaque white to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polyphenylene Sulfide
Polyphenylene sulfide (PPS) is an organic polymer consisting of aromatic rings linked by sulfides. Synthetic fiber and textiles derived from this polymer resist chemical and thermal attack. PPS is used in filter fabric for coal boilers, papermaking felts, electrical insulation, film capacitors, specialty membranes, gaskets, and packings. PPS is the precursor to a conductive polymer of the semi-flexible rod polymer family. The PPS, which is otherwise insulating, can be converted to the semiconducting form by oxidation or use of dopants.David Parker, Jan Bussink, Hendrik T. van de Grampel, Gary W. Wheatley, Ernst-Ulrich Dorf, Edgar Ostlinning, Klaus Reinking, "Polymers, High-Temperature" in Ullmann's Encyclopedia of Industrial Chemistry 2002, Wiley-VCH: Weinheim. Polyphenylene sulfide is an engineering plastic, commonly used today as a high-performance thermoplastic. PPS can be molded, extruded, or machined to tight tolerances. In its pure solid form, it may be opaque white to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seal (mechanical)
A mechanical seal is a device that helps join systems and mechanisms together by preventing leakage (e.g. in a pumping system), containing pressure, or excluding contamination. The effectiveness of a seal is dependent on adhesion in the case of sealants and compression in the case of gaskets. The seals are installed in pumps in a wide range of industries including chemicals, water supply, paper production, food processing and many other applications. A stationary seal may also be referred to as 'packing'. Seal types: *Induction sealing or cap sealing * Adhesive, sealant * Bodok seal, a specialized gas sealing washer for medical applications * Bonded seal, also known as Dowty seal or Dowty washer. A type of washer with integral gasket, widely used to provide a seal at the entry point of a screw or bolt * Bridgman seal, a piston sealing mechanism that creates a high pressure reservoir from a lower pressure source *Bung *Compression seal fitting *Diaphragm seal *Ferrofluidic se ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DIC Corporation
is Japanese chemical company, specializing in the development, manufacture and sale of inks, pigments, polymers, specialty plastics and compounds and biochemicals. It was founded in 1908 as Kawamura Ink Manufactory, renamed to Kawamura Kijuro Shoten in 1915, incorporated as Dainippon Printing Ink Manufacturing in 1937 and renamed to Dainippon Ink and Chemicals (DIC) in 1962 before the name was changed to the present name DIC Corporation in 2008 on the occasion of its 100th anniversary. The company slogan "Color & Comfort By Chemistry" suggests that DIC products should deliver color and comfort to daily life. The company operates worldwide (through 176 subsidiary and affiliate companies in 62 countries) and includes the Sun Chemical corporation, based in the Americas and Europe. DIC in Japan has 10 plants in Japan, located in Tokyo, Chiba, Hokuriku, Sakai, Kashima, Yokkaichi, Shiga, Komaki, Saitama, and Tatebayashi. The main research laboratory in Japan is located in Sakura ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Celanese
Celanese Corporation, formerly known as Hoechst Celanese, is an American technology and specialty materials company headquartered in Irving, Texas. A Fortune 500 corporation, the company is the world’s leading producer of acetic acid, producing about 1.95 million tonnes per year, representing approximately 25% of global production. Celanese is also the world's largest producer of vinyl acetate monomer (VAM). Celanese operates 25 production plants and six research centers in 11 countries, mainly in North America, Europe, and Asia. The company owns and operates the world's three largest acetic acid plants: one in the Clear Lake area of Pasadena, Texas, one on Jurong Island in Singapore, and a third in Nanjing, China. History In 1918, the American Cellulose & Chemical Manufacturing Company (known as Amcelle) was founded in New York City by Swiss chemist Camille Dreyfus. The American Cellulose and Chemical Manufacturing Co. Ltd plant in Cumberland, Maryland, was set up dur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SK Chemicals
SK Group (Korean: SK그룹, 에스케이그룹) is the second largest South Korean chaebol behind Samsung Group. SK Group is composed of 186 subsidiaries and affiliates that share the SK brand name and the group's management culture, named SKMS (SK Management System). It changed its name from Sunkyong Group (Korean: 선경그룹, Hanja : 鮮京그룹) to SK Group in 1998. The group is controlled by estate of Chey Tae-won through a holding company SK Inc. The cornerstone of SK Group is its energy and chemicals division. While its largest businesses are primarily involved in the energy, petroleum, and chemical industries, the group also owns the nation's largest wireless mobile phone service provider SK Telecom, and provides services in construction, marketing, local telephone, high-speed Internet, and wireless broadband (WiBro), and also the owner of SK Hynix, the world's fourth largest chipmaker. History Formation and early production As with many other chaebols, SK Group's ch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kureha Chemical Industries
is a Japanese manufacturer of specialty chemicals, polymers and agrichemicals. Corporate affairs Kureha Chemical Industries is a member of the Mizuho keiretsu. Products Polyglycolic acid One of the company's long term investments is in polyglycolic acid (PGA). The company developed a mass scale manufacturing technique for the chemical, which has been a development project of the company since the early 90s. The company has stated a strategy of committing to invest in PGA for a long period, patiently waiting for market demand to develop. To manufacture PGA, the company invested 100 million in a manufacturing facility in Belle, West Virginia to be located nearby a Dupont plant that produces glycolic acid, a primary feedstock for PGA. Polyphenylene sulfide Kureha is the world's largest producer of polyphenylene sulfide, a heat-resistant polymer is used in industrial applications such as automotive electronics. The polymer its produced at the company's site in Iwaki, Japan and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solvay S
Solvay may refer to: Companies and organizations * Solvay Brussels School of Economics and Management, Brussels, Belgium * Solvay Conference, founded by Ernest Solvay, deals with open questions in physics and chemistry * Solvay Indupa, an Argentine petrochemical company formerly owned by Solvay * Solvay Institute of Sociology, Brussels, Belgium, part of the Université Libre de Bruxelles * Solvay Process Company (1880–1985), a former U.S. company that employed the Solvay process * Solvay Public Library, on the National Register of Historic Places * Solvay S.A., an international chemicals and plastics company founded by Ernest Solvay Places * Solvay Castle, La Hulpe, Belgium * Solvay Hut, on the Matterhorn * Hôtel Solvay, a town house in Brussels, Belgium * Solvay, New York, a village * Solvay Mountains, Brabant Island, off the coast of Antarctica People * Ernest Solvay (1838–1922), Belgian chemist, inventor of the Solvay process * Lucien Solvay (1851–1950), Belgian journal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lumena
China Lumena New Materials (commonly called Lumena) is a Chinese mining and manufacturing company primarily engaged in the production of polyphenylene sulfide (PPS), an industrial plastic. According to a market research report in 2016, the company is among the largest producers of PPS. Lumena mines the glauberite and associated class of minerals that is the raw ingredient used by the company to manufacture PPS and thenardite products including laxatives. History The company traces its origins to 1952. In June 2009, the company raised US$149 million in an IPO on the Hong Kong Stock Exchange. Although the company had planned to launch an IPO in 2008, the Sichuan earthquake that year delayed the plans. The Hong Kong listed company was suspended from trading by the exchange after Glaucus, a short seller investment research firm, published a report that alleged sales stated by the company were fraudulently inflated and its claim to have the most production capacity volume was mislea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
High-performance Plastics
High-performance plastics are plastics that meet higher requirements than ''standard'' or ''engineering'' plastics. They are more expensive and used in smaller amounts. Definition High performance plastics differ from standard plastics and engineering plastics primarily by their temperature stability, but also by their chemical resistance and mechanical properties, production quantity, and price... There are many synonyms for the term high-performance plastics, such as: high temperature plastics, high-performance polymers, high performance thermoplastics or high-tech plastics. The name high temperature plastics is in use due to their continuous service temperature (CST), which is always higher than 150 °C by definition (although this is not their only feature, as it can be seen above). The term "polymers" is often used instead of "plastics" because both terms are used as synonyms in the field of engineering. If the term "high-performance thermoplastics" is used, it is b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Engineering Plastic
Engineering plastics are a group of plastic materials that have better mechanical and/or thermal properties than the more widely used commodity plastics (such as polystyrene, PVC, polypropylene and polyethylene). Being more expensive than standard plastics, engineering plastics are produced in lower quantities and tend to be used for smaller objects or low-volume applications (such as mechanical parts), rather than for bulk and high-volume ends (like containers and packaging). Engineering plastics have a higher heat resistance than standard plastics and are continuously usable at temperatures up to about 150 °C. The term usually refers to thermoplastic materials rather than thermosetting ones. Examples of engineering plastics include polyamides (PA, nylons), used for skis and ski boots; polycarbonates (PC), used in motorcycle helmets and optical discs; and poly(methyl methacrylate) (PMMA, major brand names acrylic glass and plexiglass), used e.g. for taillights and protective ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dopant
A dopant, also called a doping agent, is a trace of impurity element that is introduced into a chemical material to alter its original electrical or optical properties. The amount of dopant necessary to cause changes is typically very low. When doped into crystalline substances, the dopant's atoms get incorporated into its crystal lattice. The crystalline materials are frequently either crystals of a semiconductor such as silicon and germanium for use in solid-state electronics, or transparent crystals for use in the production of various laser types; however, in some cases of the latter, noncrystalline substances such as glass can also be doped with impurities. In solid-state electronics using the proper types and amounts of dopants in semiconductors is what produces the p-type semiconductors and n-type semiconductors that are essential for making transistors and diodes. Transparent crystals Lasing media The procedure of doping tiny amounts of the metals chromium (Cr), ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oxidation
Redox (reduction–oxidation, , ) is a type of chemical reaction in which the oxidation states of substrate change. Oxidation is the loss of electrons or an increase in the oxidation state, while reduction is the gain of electrons or a decrease in the oxidation state. There are two classes of redox reactions: * ''Electron-transfer'' – Only one (usually) electron flows from the reducing agent to the oxidant. This type of redox reaction is often discussed in terms of redox couples and electrode potentials. * ''Atom transfer'' – An atom transfers from one substrate to another. For example, in the rusting of iron, the oxidation state of iron atoms increases as the iron converts to an oxide, and simultaneously the oxidation state of oxygen decreases as it accepts electrons released by the iron. Although oxidation reactions are commonly associated with the formation of oxides, other chemical species can serve the same function. In hydrogenation, C=C (and other) bonds ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
