Find more compounds similar to Styrene.. In 1839, the German apothecary Eduard Simon isolated a volatile liquid from the resin (called storax or styrax (Latin)) of the American sweetgum tree (Liquidambar styraciflua). ... Molecular Weight: 158.24 g/mol. Molecular Weight Distribution and Correlation between Chemical Composition and Molecular Weight in a High-Conversion Copolymer of Styrene-Methyl Acrylate. Finding molar mass starts with units of grams per mole (g/mol). Search results for styrene at Sigma-Aldrich. The dehydrogenation effluent is cooled and separated and the ethylene stream is recycled to the alkylation unit. Acid Number (mg KOH/gm) Tg, °C TS (Softening Point), °C T1, °C T2, °C Acrylonitrile Butadiene Styrene/Polycarbonate (ABS/PC) blends are commonly used in commercial and industrial applications such as example automotive, electronics, telecommunication, etc. Data compiled as indicated in comments: ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein DRB - Donald R. Burgess, Jr. GT- Glushko Thermocenter, Russian Academy of Sciences, Moscow Compare Products: Select up to 4 products. Styrene occurs naturally in small quantities in some plants and foods (cinnamon, coffee beans, balsam trees[disambiguation needed] and peanuts)[7] and is also found in coal tar. Polystyrene is a hard, brilliantly transparent, stiff resin. Go To: Top, References, Notes Data compilation copyrightby the U.S. Secretary of Commerce on behalf of the U.S.A.All rights reserved. Styrene will polymerise spontaneously to polystyrene, without the need of external initiators. The role of cytochrome-P-450 in initiating the metabolism of styrene derivatives was investigated in Holtzman-rat liver homogenates. Convert grams Styrene to moles  or  moles Styrene to grams, Molecular weight calculation: An example is the 2019 explosion of the tanker Stolt Groenland; in this incident 5,250 metric tons of styrene monomer detonated while the ship was docked in Ulsan, Republic of Korea. *Please select more than one item to compare Component Compounds: CID 7845 (1,3-Butadiene) CID 7501 (Styrene) Dates: Modify . STYRENE/ISOPRENE COPOLYMER AldrichCPR; CAS Number: 25038-32-8; Linear Formula: C13H16; find null-S462152 MSDS, related peer-reviewed papers, technical documents, similar products & more at Sigma-Aldrich. Solution for The molecular weight of polymer when styrene is polymerized in benzene is 400,000. A common request on this site is to convert grams to moles. They had found that cinnamic acid could be decarboxylated to form "cinnamene" (or "cinnamol"), which appeared to be styrene. [44] Various regulatory bodies refer to styrene, in various contexts, as a possible or potential human carcinogen. For instance, polymerizing styrene, a monomer, under suitable reaction conditions, results in the polymer polystyrene (Figure 1). [57][58], InChI=1S/C8H8/c1-2-8-6-4-3-5-7-8/h2-7H,1H2, Except where otherwise noted, data are given for materials in their. [12] Furthermore, they could obtain styrene by dry-distilling "metastyrol". The molecular weights of the general-purpose UP resins have a number average molecular weight of 900 g/mol and a weight average molecular weight of 2400 g with a polydispersity of 2.7. They concluded, "The findings have to be interpreted with caution, due to the company based exposure assessment, but the possible association between exposures in the reinforced plastics industry, mainly styrene, and degenerative disorders of the nervous system and pancreatic cancer, deserves attention". [36][37] However, a STATS author describes[38] a review that was done on scientific literature and concluded that "The available epidemiologic evidence does not support a causal relationship between styrene exposure and any type of human cancer". [15] Meanwhile, other chemists had been investigating another component of storax, namely, cinnamic acid. The source is also providing more information like the publication year, authors and more. molar mass and molecular weight. Styrene-butadiene copolymer is a polymer. Approximately 25 million tonnes of styrene were produced in 2010, increasing to around 35 million tonnes by 2018. The crude ethylbenzene/styrene product is then purified by distillation. [18] Eventually, in 1876, the Dutch chemist van 't Hoff resolved the ambiguity: the optical activity of the styrene that was obtained by distilling storax resin was due to a contaminant.[19]. Convert grams Styrene to moles or moles Styrene to grams. Another application is as cement used in total hip replacements as well as total knee replacements. Figure 1. It becomes rigid again when it cools down. It is reported[24] that an approximately 9:1 mixture of styrene and ethylbenzene is obtained, with a total styrene yield of over 60%. 2021-01-02. polystyrene). [25], Another route to styrene involves the reaction of benzene and ethane. Molecular weight calculation: 12.0107*8 + … Thirteen people reportedly died and over 200 people were hospitalized. Note: Cheméo is only indexing the data, follow the source links to retrieve the latest data. SBR 1500 is a high-molecular-weight SBR combining good extrusion behavior and superior compound properties. [13] In 1865, the German chemist Emil Erlenmeyer found that styrene could form a dimer,[14] and in 1866 the French chemist Marcelin Berthelot stated that "metastyrol" was a polymer of styrene (i.e. [40] In 2012, the Danish EPA concluded that the styrene data do not support a cancer concern for styrene. Styrene is regarded as a "known carcinogen", especially in case of eye contact, but also in case of skin contact, of ingestion and of inhalation, according to several sources. Six parasubstituted styrenes were prepared from the corresponding acetophenones by borohydride reduction to p-bromostyrene, p-chlorostyrene, p-cyanostyrene, p-methylstyrene, p-phenylstyrene, and p-methoxystyrene. Contents. The compound evaporates easily and has a sweet smell, although high concentrations have a less pleasant odor. A comprehensive mathematical model for styrene polymerization with asymmetric bifunctional initiators was developed, aiming at the prediction of not only productivity and average molecular properties as previous models did, but also the complete molecular weight distribution. To complete this calculation, you have to know what substance you are trying to convert. The International Agency for Research on Cancer considers styrene to be "probably carcinogenic to humans". 12.0107*8 + 1.00794*8. What is Polystyrene? This derivative of benzene is a colorless oily liquid, although aged samples can appear yellowish. The reason is that the molar mass of the substance affects the conversion. Approximately 25 million tonnes of styrene were produced in 2010,[6] increasing to around 35 million tonnes by 2018. 2005-08-08. The process attempts to overcome previous shortcomings in earlier attempts to develop production of styrene from ethane and benzene, such as inefficient recovery of aromatics, production of high levels of heavies and tars, and inefficient separation of hydrogen and ethane. Molar mass of C8H8 = 104.14912 g/mol. The formula weight is simply the weight in atomic mass units of all the atoms in a given formula. [11] They had also determined that Simon's "styrol oxide" – which they renamed "metastyrol" – had the same empirical formula as styrene. Create . In chemistry, the formula weight is a quantity computed by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together. 6,806 6,944 4,801 8,544 The remaining 1-phenylethanol is dehydrated to give styrene: Extraction from pyrolysis gasoline is performed on a limited scale. Substituted Styrene's Preparation of Low Molecular Weight Monofunctional Polystyrene Macroinitiators: MW 1100 and 2000. In this process, ethylbenzene is treated with oxygen to form the ethylbenzene hydroperoxide. This process is being developed by Snamprogetti and Dow. ›› Styrene molecular weight. where hard yet light-weight, heat resistant and easily processed materials are required. [22] The polymerisation reaction is exothermic; hence, there is a real risk of thermal runaway and explosion. [54][55][56], On 7 May 2020, a gas, reported to be styrene, leaked from a tank at the LG Chem (LG Polymers India Private Limited) plant at RR Venkatapuram, Visakhapatnam, Andra Pradesh, India. [34][35] On 10 June 2011, the U.S. National Toxicology Program has described styrene as "reasonably anticipated to be a human carcinogen". Sigma-Aldrich offers a number of Styrene products. This is achieved using superheated steam (up to 600 °C) over an iron(III) oxide catalyst. 1170 matches found for styrene Advanced Search | Structure Search Sort By Relevance Name ↑ Name ↓ Base Name ↑ Base Name ↓ Formula Weight ↑ Formula Weight ↓ Development of the process is ongoing. View information & documentation regarding Styrene, including CAS, MSDS & more. Polystyrene-polybutadiene. For further details of the history of styrene, see: F. W. Semmler, (Blyth and Hofmann, 1845a), p. 348. [8][9] He also noticed that when styrol was exposed to air, light, or heat, it gradually transformed into a hard, rubber-like substance, which he called "styrol oxide". Calculate the molecular weight As such, the two production processes are often highly integrated. Stephen K. Ritter, Chemical & Engineering News, 19 March 2007, p.46. [43] The National Toxicology Program of the U.S. Department of Health and Human Services has determined that styrene is "reasonably anticipated to be a human carcinogen". The polymer is formed by a radical polymerization, using an organic peroxide as the initiator. The compound evaporates easily and has a sweet smell, although high concentrations have a less pleasant odor. [50][51][52][53] Studies on rats have yielded contradictory results,[51][52] but epidemiologic studies have observed a synergistic interaction with noise in causing hearing difficulties. Each carbon of the backbone has tetrahedral geometry, and those carbons that have a phenyl group (benzene ring) attached are stereogenic. Styrene maleic anhydride (SMA or SMAnh) is a synthetic polymer that is built-up of styrene and maleic anhydride monomers.The monomers can be almost perfectly alternating, making it an alternating copolymer, but (random) copolymerisation with less than 50% maleic anhydride content is also possible. Data compiled as indicated in comments: BS - Robert L. Brown and Stephen E. Stein TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Kenneth Kroenlein director ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein AC - William E. Acree, Jr., James S. Chickos DRB - Donald R. Burgess, Jr. DH- Eugene S. Domalski and Elizabeth D. Hearing When calculating molecular weight of a chemical compound, it tells us how many grams are in one mole of that substance. The percentage by weight of any atom or group of atoms in a compound can be computed by dividing the total weight of the atom (or group of atoms) in the formula by the formula weight and multiplying by 100. Styrene (/ˈstaɪriːn/)[5] is an organic compound with the chemical formula C6H5CH=CH2. This derivative of benzene is a colorless oily liquid, although aged samples can appear yellowish. Ethylbenzene is produced via a Friedel–Crafts reaction between benzene and ethylene; originally this used aluminum chloride as a catalyst, but in modern production this has been replaced by zeolites. Go To: Top, References, Notes Data compilation copyrightby the U.S. Secretary of Commerce on behalf of the U.S.A.All rights reserved. [41] The U.S. EPA does not have a cancer classification for styrene,[42] but it has been the subject of their Integrated Risk Information System (IRIS) program. Bound Styrene, mole % Bound Allyl Alcohol, mole % PHYSICAL PROPERTIES Physical Form Appearance Color, APHA (30% in MEK) Molecular Weight, GPC (Number Average, Mn) Molecular Weight, GPC (Weight Average, Mw) Pd (Polydispersity) Hydroxyl Number (mg KOH/gm) Equivalent wt. The atomic weights used on this site come from NIST, the National Institute of Standards and Technology. It has relatively wide molecular weight distribution and the butadiene component has an average about 9% Cis-1,4; 54.5% trans and 13% 1,2 vinyl structure. This site explains how to find molar mass. The word “polymer” has been derived from the Greek words 'poly' and 'meros', implying many parts, and refers to a characterizing feature of polymeric materials – their chain like structure. Browse the list of SBR 1500 contains antioxidant to avoid product degradation. of a chemical compound, More information on Butadiene-styrene rubber. 1 Structures Expand this section. If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. Ethane, along with ethylbenzene, is fed to a dehydrogenation reactor with a catalyst capable of simultaneously producing styrene and ethylene. Styrene is an organic compound with the chemical formula C6H5CH=CH2. This structure is formed by developing chemical links between a number of monomers or repeating units. This is energy intensive and is further complicated by the tendency of styrene to undergo thermally induced polymerisation into polystyrene,[22] requiring the continuous addition of polymerization inhibitor to the system. common chemical compounds. Simon, in Polymer Nanocomposites, 2006. [39] Despite this claim, work has been done by Danish researchers to investigate the relationship between occupational exposure to styrene and cancer. Styrene is the precursor to polystyrene and several copolymers. At 100 °C it will polymerise at a rate of ~2% per hour, and more rapidly than this at higher temperatures. Styrene and maleic anhydride monomers are copolymerized in 1,2-dichloroethane employing 3-mercaptopropionic acid or methyl-3-mercaptopropionate chain transfer agents producing an odorless copolymer in the molecular weight range of about 500 to 10,000 which remains soluble in the solvent. [33] The U.S. Environmental Protection Agency (EPA) has described styrene to be "a suspected toxin to the gastrointestinal tract, kidney, and respiratory system, among others". Styrene is named after storax balsam, the resin of Liquidambar trees of the Altingiaceae plant family. Around 80% of styrene is produced by the dehydrogenation of ethylbenzene. This process has suffered from low selectivity associated with the competing decomposition of methanol. 0.3146g CuBr (2.2 x 10-3 mole) was added to a round bottom flask. This is how to calculate molar mass (average molecular weight), which is based on isotropically weighted averages. This is not the same as molecular mass, which is the mass of a single molecule of well-defined isotopes. US7985819B2 US12/411,522 US41152209A US7985819B2 US 7985819 B2 US7985819 B2 US 7985819B2 US 41152209 A US41152209 A US 41152209A US 7985819 B2 US7985819 B2 US 7985819B2 Authority US United States Prior art keywords maleic anhydride styrene copolymer water weight Prior art date 2006-03-30 Legal status (The legal status is an assumption and is not a legal … The invention discloses a low-molecular-weight styrene-maleic anhydride alternating copolymer synthesis method. The general-purpose UP resins based on propylene glycol, phthalic, and maleic anhydride are miscible with styrene. ChEBI. mol −1 : Appearance Colorless liquid Density: 0.91 g/cm 3: Melting point −24 °C (−11 °F; 249 K) Boiling point: 165 to 169 °C (329 to 336 °F; 438 to 442 K) [17] However, the styrene that was obtained from cinnamic acid seemed different from the styrene that was obtained by distilling storax resin: the latter was optically active. This hydroperoxide is then used to oxidize propylene to propylene oxide, which is also recovered as a co-product. It is produced by the polymerization of styrene and is the most widely used plastic. [20][30][31][32] Styrene is largely metabolized into styrene oxide in humans, resulting from oxidation by cytochrome P450. 12.2.3 Styrene-butadiene rubber (SBR) Styrene-butadiene rubber is the most-widely used synthetic rubber in the elastomer industry, with the largest volume production.It is a copolymer of styrene (C 6 H 5 CH=CH 2) and butadiene (CH 2 =CH–CH=CH 2), typically containing about 23% styrene and 77% butadiene. Styrene oxide is considered toxic, mutagenic, and possibly carcinogenic. Question:.The Number-average Molecular Weight Of A Poly (styrene-butadiene) Alternating Copolymer Is 1,350,000 G/mol.What Is The Average Number Of Styrene And Butadiene Repeat Units Per Molecule. Commercially significant products include polystyrene, ABS, styrene-butadiene (SBR) rubber, styrene-butadiene latex, SIS (styrene-isoprene-styrene), S-EB-S (styrene-ethylene/butylene-styrene), styrene-divinylbenzene (S-DVB), styrene-acrylonitrile resin (SAN), and unsaturated polyesters used in resins and thermosetting compounds.