distinguish hexane Unreferenced stub auto yes date December 2009 Hexene is a higher olefin , or alkene with a formula Carbon C sub 6 sub Hydrogen H sub 12 sub . The Hex is derived from the fact that there are 6 carbon atoms in the molecule, while the ene suffix denotes that two carbon atoms are connected via a double bond. There are several isomer s of hexene, depending on the position of the double bond and the branching of the carbon chain. One of the most common industrially useful isomers is 1 Hexene 1 hexene , an alpha olefin . Hexene is used as a comonomer in the production of polythene . See also Alkene ene Alkenes Category Alkenes Hydrocarbon stub ar cs Hexen de Hexene fi Hekseeni it Esene nl Hexeen sv Hexen alken ... more details
DISPLAYTITLE C sub 6 sub H sub 12 sub The molecular formula C sub 6 sub H sub 12 sub may refer to Cyclohexane Hexene s 1 Hexene Methylcyclopentane 4 Methyl 1 pentene MolFormDisambig Long comment to avoid being listed on short pages fr C6H12 it C6H12 nl C6H12 zh C6H12 ... more details
Image Isotoluenes.png right 400px The isotoluenes The isotoluenes in organic chemistry are the non Aromaticity aromatic toluene isomer s with an exocyclic double bond . They are of some academic interest in relation to aromaticity and isomerisation mechanisms. ref Radical production from the interaction of closed shell molecules. 10. Chemistry of methylenecyclohexadiene and the thermal polymerization of styrene W. David Graham, John Glass Green, and William A. Pryor J. Org. Chem. 1979 44 6 pp 907 914 DOI 10.1021 jo01320a003 . ref ref Bimolecular reactions of 3 methylene 1,4 cyclohexadiene p isotoluene , 5 methylene 1,3 cyclohexadiene o isotoluene , 1 methylene 1,4 dihydronaphthalene benzo p isotoluene , and 9 methylene 9,10 dihydroanthracene dibenzo p isotoluene Joseph J. Gajewski and Andrea M. Gortva J. Org. Chem. 1989 54 2 pp 373 378 DOI 10.1021 jo00263a021 ref The three basic isotoluenes are aromatic ortho substituent ortho isotoluene or 5 methylene 1,3 cyclohexadiene here labelled 1 aromatic para substituent para isotoluene 2 and aromatic meta substituent meta isotoluene 3 . Another structural isomer is the bicyclic compound 5 methylenebicyclo 2.2.0 hexene 4 . The o and p isotoluenes isomerise to toluene, a reaction driven by aromatic stabilisation. It is estimated that these compounds are 23 kcal mol less stable. The isomerisation of p isotoluene to toluene takes place at 100 C in benzene with second order reaction bimolecular reaction kinetics by an intermolecular free radical reaction . The intramolecular isomerisation, a 1,3 sigmatropic reaction , is unfavorable because a antarafacial mode is enforced. ref JerryMarch ref Other Dimer chemistry dimer radical reaction products are formed as well. The ortho isomer is found to isomerise at 60 C in benzene, also in a second order reaction. The proposed reaction mechanism is a concerted reaction concerted intermolecular ene reaction . The reaction product is either toluene or a mixture of dimerized ene reaction pro ... more details
File LLDPE.jpg thumb Linear low density polyethylene LLDPE granules. Linear low density polyethylene LLDPE is a substantially linear polymer polyethylene , with significant numbers of short branches, commonly made by copolymerization of ethylene with longer chain olefin s. Linear low density polyethylene differs structurally from conventional low density polyethylene LDPE because of the absence of long chain branching. The linearity of LLDPE results from the different manufacturing processes of LLDPE and LDPE. In general, LLDPE is produced at lower temperatures and pressures by copolymerization of ethylene and such higher alpha olefins as butene , hexene , or octene . The copolymerization process produces an LLDPE polymer that has a narrower molecular weight distribution than conventional LDPE and in combination with the linear structure, significantly different rheological properties. Production and properties The production of LLDPE is initiated by transition metal catalysts, particularly Ziegler or Philips type of catalyst. The actual polymerization process can be done either in solution phase or in gas phase reactors. Usually, octene is the comonomer in solution phase while butene and hexene are copolymerized with ethylene in a gas phase reactor. LLDPE has higher tensile strength and higher impact and puncture resistance than does Low density polyethylene LDPE . It is very flexible and elongates under stress. It can be used to make thinner films, with better environmental stress cracking resistance. It has good resistance to chemicals. It has good electrical properties. However, it is not as easy to process as LDPE, has lower gloss, and narrower range for heat sealer heat sealing . Processing LDPE and LLDPE have unique rheological or melt flow properties. LLDPE is less shear sensitive because of its narrower molecular weight distribution and shorter chain branching. During a shearing process, such as extrusion, LLDPE remains more viscous and, therefore, harder t ... more details
Chembox verifiedrevid 477207844 Name 1 Hexene ImageFile 1 Hexene.PNG ImageSize ImageName 1 Hexene IUPACName Hex 1 ene OtherNames Hexene, Hexylene, butyl ethylene Section1 Chembox Identifiers SMILES C CCCCC ChemSpiderID Ref chemspidercite correct chemspider ChemSpiderID 11109 InChI 1 C6H12 c1 3 5 6 4 ... flammable F Harmful XN 1 Hexene is an organic compound with the formula CH sub 2 sub CHC sub 4 sub ... with higher reactivity and thus useful chemical properties. 1 Hexene is an industrially significant linear alpha olefin . 1 Hexene is a colourless liquid. Production 1 Hexene is commonly manufactured ... technology. A minor route to 1 hexene, used commercially on smaller scales, is the Dehydration reaction dehydration of hexanol . Prior to the 1970s, 1 hexene was also manufactured by the thermal ... to produce 21 percent 1 hexene. CP Chemicals and Innovene also have full range processes. Typically, 1 hexene content ranges from about twenty percent distribution in the Ethyl Innovene process, whereas ... to 1 hexene using ethylene trimerization was first brought on stream in Qatar in 2003 by Chevron ... Chemical announces plans for world scale 1 hexene plant Plastinfo, Plastics Industry Directory, Retrieved 30 September 2011 ref The Sasol process is also considered an on purpose route to 1 hexene ... coal. The synthesis recovers 1 hexene from the aforementioned fuel streams, where the initial 1 hexene concentration cut may be 60 in a narrow distillation, with the remainder being vinylidenes, linear ... as Highly Efficient Catalysts for the Trimerization of Ethylene to 1 Hexene J. Am. Chem. Soc ... to produce 1 hexene. A semi commercial unit has been in operation in Tianjin, China to demonstrate the Lummus technology. Applications The primary use of 1 hexene is as a comonomer in production of polyethene ... 2 4 and 8 10 of comonomers, respectfully. Another significant use of 1 hexene is the production of the linear ... ull.chemistry.uakron.edu erd chemicals 1000 71.html Chemical Database, 1 Hexene DEFAULTSORT Hexene ... more details
Image Pallet wrapper.jpg right thumb Pallet with corrugated fiberboard boxes being stretch wrapped Stretch wrap or stretch film is a highly stretchable plastic film that is wrapped around items. The elastic recovery keeps the items tightly bound. In contrast, shrink wrap is applied loosely around an item and shrinks tightly with heat. It is frequently used to unitize pallet loads but also may be used for bundling smaller items. Types of stretch film include bundling stretch film, hand stretch film, extended core stretch film, machine stretch film and static dissipative film. Materials The most common stretch wrap material is linear low density polyethylene or LLDPE, which is produced by copolymerization of ethylene with alpha olefins, the most common of which are butene , hexene and octene . The use of higher alpha olefins hexene or octene gives rise to enhanced stretch film characteristics, particularly in respect of elongation at break and puncture resistance . Other types of polyethylene and Polyvinyl chloride PVC can also be used. Many films have about 500 stretch at break but are only stretched to about 100 300 in use. Once stretched, the elastic recovery is used to keep the load tight.These machines offers safety for the products. There are two methods of producing stretch wrap. 1 Blown the resin is melted and blown out, it is air cooled. This is a slower process but provides for higher quality in all the areas listed below. The cost of production is also higher due to the quantity that can be produced per hour. 2 Cast the film is passed over cooling rollers. This makes the cooling process quick. The quality is not as good as blown but more can be produced in an hour lower costs. Other properties such as break strength, cling, clarity, tear resistance, static discharge , etc. are also important. Functions In pallet unitizing, stretch wrap can have several functions improved stability of products or packages, forming a unit load more efficient handling and stor ... more details
refimprove date September 2008 Polymer characterization is the analytical branch of polymer science . The discipline is concerned with the characterization of polymeric materials on a variety of levels. The characterization typically has as a goal to improve the performance of the material which implies that the characterization should ideally also be linked to the parameters that are related to the desirable properties of the material such as strength, impermeability, toughness, optical properties and the like. Chemical structure The chemical structure of many polymers is rather complex because the polymerization reaction does not necessarily produce identical molecules as in the case in the DNA coded synthesis of biopolymers. A polymeric material typically consists of a distribution of molecular sizes and sometimes also of shapes. Chromatography Chromatographic methods like size exclusion chromatography often in combination with Low angle laser light scattering LALLS and or viscometry can be used to determine the molecular weight distribution as well as the degree of long chain branching of a polymer, provided a suitable solvent can be found. Copolymers with short chain branching such as linear low density polyethylene a copolymer of ethylene and a higher alkene such as hexene or octene require a different approach. Analytical Temperature Rising Elution Fractionation ATREF techniques can reveal how the short chain branches are distributed over the various molecular weights. Thermal properties A true workhorse for polymer characterization is thermal analysis , particularly Differential scanning calorimetry . Changes in the compositional and structural parameters of the material usually affect its melting transitions or glass transitions and these in turn can be linked to many performance parameters. For semicrystalline polymers it is an important method to measure crystallinity. Thermogravimetric analysis can also give an indication of polymer thermal stability and ... more details
s. ref name Ullmann In principle, 1 Hexene 1 hexene could be converted to 1 hexanol by hydroboration ... Hexene hexanol.png center This method is instructive and useful in laboratory synthesis but of no practical ... more details
Distinguish hexene Contradict reason I don t think even the word relatively allows this claim to easily coexist with all the warnings later in the article date February 2012 Chembox Watchedfields changed verifiedrevid 443856572 ImageFile Hexane 2D Skeletal.svg ImageFile Ref chemboximage correct ?? ImageSize 100 ImageName Skeletal formula of hexane ImageFileL1 Hexane from xtal 1999 at an angle 3D balls.png ImageFileL1 Ref chemboximage correct ?? ImageNameL1 Ball and stick model of hexane ImageFileR1 Hexane 3D vdW.png ImageFileR1 Ref chemboximage correct ?? ImageNameR1 Spacefill model of hexane IUPACName Hexane ref Cite web title n hexane Compound Summary url http pubchem.ncbi.nlm.nih.gov summary summary.cgi?cid 8058&loc ec rcs work PubChem Compound publisher National Center for Biotechnology Information accessdate 31 December 2011 location USA date 16 September 2004 at Identification and Related Records ref OtherNames n Hexane Citation needed date December 2011 Section1 Chembox Identifiers CASNo 110 54 3 CASNo Ref cascite correct CAS PubChem 8058 PubChem Ref Pubchemcite correct Pubchem ChemSpiderID 7767 ChemSpiderID Ref chemspidercite correct chemspider UNII 2DDG612ED8 UNII Ref fdacite correct FDA EINECS 203 777 6 UNNumber 1208 DrugBank DB02764 DrugBank Ref drugbankcite correct drugbank KEGG C11271 KEGG Ref keggcite correct kegg MeSHName n hexane ChEBI 29021 ChEBI Ref ebicite correct EBI ChEMBL 15939 ChEMBL Ref ebicite correct EBI RTECS MN9275000 Beilstein 1730733 Gmelin 1985 SMILES CCCCCC StdInChI 1S C6H14 c1 3 5 6 4 2 h3 6H2,1 2H3 StdInChI Ref stdinchicite correct chemspider StdInChIKey VLKZOEOYAKHREP UHFFFAOYSA N StdInChIKey Ref stdinchicite correct chemspider Section2 Chembox Properties C 6 H 14 ExactMass 86.109550448 g mol sup 1 sup Appearance Colorless, transparent liquid Odor Petrolic Density 654.8 mg mL sup 1 sup MeltingPtKL 177 MeltingPtKH 179 BoilingPtKL 341.6 ... Hexene References Reflist 2 External links http www.inchem.org documents icsc icsc eics1262.htm International ... more details
of 1 hexene can be copolymerized with ethylene into a more flexible form of polyethylene. other higher ... ethylene dichloride or EDC br Ethylene glycol EG br Ethylene oxide EO br Formaldehyde br n Hexene ... more details
this value is set on 1. For some compounds the q parameter is optimized between 0.9 and 1 e.g. hexene ... 0.90 0.00 0.24 N,N diethylacetamide 124.5 15.66 6.71 1.00 0.25 18.67 1 hexene 125.8 15.23 0.22 0.93 ... more details
a matter of seconds chemical equilibrium with 2 butene and 3 hexene . No double bond migrations are observed, the reaction can be started with the butene and hexene as well and the reaction can ... more details
Encyclopedia
top
