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Topic: Monomer

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In the News (Mon 18 Dec 17)

  Si Monomer Traps on Si(001)
The single-dimer-wide island in the upper right (arrow) appears as a broad band in the filled states and as two thinner stripes in the empty states.
Individual monomers can be seen in the empty states images bound at the end of the rebonded-SB dimer rows.
Monomers (labeled "M") can become trapped at the ends of rebonded-SB type dimer rows with a binding activation barrier of ~1.0 eV.
www.sandia.gov /surface_science/stm/monomers/MONOMERS.HTM   (425 words)

  Monomer Summary
Monomers are the single repeating units of any polymer (which means "many members.") For example, styrene is the monomer from which polystyrene polymers are produced and vinyl chloride is the monomer of polyvinyl chloride (or PVC).
A monomer is a an organic molecule that is involved in polymerization reactions.
Examples of monomers are hydrocarbons such as the alkene and arene homologous series.
www.bookrags.com /Monomer   (1362 words)

 Vinyl monomer compositions with accelerated surface cure - Patent 5288807
These compositions are prepared from a vinyl monomer or monomer mixtures such as blend of isobornyl methacrylate and hydroxypropyl methacrylate, a bulk phase polymerization catalyst system, a polyvalent metal oxidative surface phase catalyst, and a diolefin rubber dispersed in the vinyl monomer as a surface cure accelerator.
These compositions are prepared from a vinyl monomer or monomer mixture of dicyclopentenyloxyethyl methacrylate and hydroxypropyl methacrylate, a bulk phase polymerization catalyst system, a polyvalent metal oxidative surface phase catalyst and a diolefin rubber dispersed in the vinyl monomer as a surface cure accelerator.
The acceleration of the surface cure of the vinyl monomer by the diolefin rubber is unexpected, and the mechanism of the acceleration is unknown.
www.freepatentsonline.com /5288807.html   (4162 words)

 Monomer transfer device - US Patent 5306277   (Site not responding. Last check: 2007-10-31)
The monomer transfer device of this invention includes a syringe adapted to receive an ampule and adapted for connection to a vacuum source such that with the ampule open within the syringe body, the monomer is vacuumed out of the ampule and into the mixing container.
Still another object of the invention is to provide for a monomer transfer syringe including an offset to position the ampule at a critical angle and break the monomer ampule at a predetermined location when the ampule is placed within the syringe and the end cap is secured.
It should be understood that the vacuum source and monomer transfer device 10 are in flow communication with a mixing container (not shown) such that as the monomer liquid is drawn from the ampule and device 10, it is drawn into the mixing container.
www.patentstorm.us /patents/5306277-description.html   (2115 words)

 Styrene monomer - Shell Chemicals   (Site not responding. Last check: 2007-10-31)
Today, the Shell Group is the second largest producer of styrene monomer in the world and has a strong global manufacturing base.
Styrene monomer is an aromatic hydrocarbon which, under normal conditions, is a clear, colourless, flammable liquid.
The derivatives of styrene monomer are styrene-based polymers.
www.shellchemicals.com /styrene_monomer/1,1098,347,00.html   (255 words)

 EPA: Federal Register: Correction to Chemical Nomenclature for Monomer Acid and Derivatives for TSCA Inventory Purpose
The August 2, 1985 EPA letter to an industry representative on the nomenclature for monomer acids states: The co-product produced during the catalytic dimerization of tall oil fatty acids and generally known as `monomer acid' or `monomer fatty acid' is considered to be the same as tall oil fatty acids for TSCA Inventory purposes.
Therefore, it is incorrect to equate monomer acid to TOFA, or a monomer acid derivative to a TOFA derivative.
Monomer acid is considered to be the combination of non-dimerized fatty acids formed and separated as a co- product from the manufacture of dimer acid containing 36 carbon atoms that is listed in the TSCA Inventory as ``Fatty acids, C18-unsatd., dimers'' (CAS Registry Number 61788-89-4).
www.epa.gov /EPA-TOX/2001/June/Day-27/t16124.htm   (4054 words)

 Styrene Monomer
Styrene (vinyl benzene, styrene monomer sm) is a colorless to yellowish oily liquid with a distinctive aromatic odor.
Styrene Monomer liquid has a distinctive pleasant odor, but is harmful if swallowed and burns the skin and eyes.
This monomer is considered to be a moderately toxic, highly flammable and a highly reactive chemical.
www.sabic.com /asia/en/productsandservices/chemicals/styrenemonomer.aspx   (533 words)

 Quantitative Analysis of Styrene Monomer in Polystyrene and Foods Including Some Preliminary Studies of the Uptake and ...
Blood level studies with rats, dosed with styrene monomer by various routes, illustrated uptake phenomena that were dependent on the dose and route of administration and were also affected by the vehicle used to convey the styrene monomer.
Since styrene monomer is a liquid with a boiling point of 145.2°C and polystyrene is relatively soluble in aromatic hydrocarbons, alternative solvents were examined which would allow the gas chromatographic development of the solvent peak after elution of the styrene monomer.
Styrene monomer, vapor-phase exposure data: (a) 236-g male Wistar rat exposed to 45 ppm styrene monomer, 5 hr; (b) 316-g male Wistar rat exposed to 520 ppm styrene, 5 hr; (c) 281-g Wistar rat exposed to 2800 ppm styrene, 5 hr.
www.mindfully.org /Plastic/Polystyrene/Polystyrene-Foods-Styrene-Monomer.htm   (3485 words)

 Multilevel embossing by printing with a reactive monomer - Patent 4068030
Such monomers may be the di- and triacrylates and dimethacrylates and trimethylacrylates prepared by the esterification of glycols with acrylic acid and methacrylic acid.
By virtue of having the monomer present both in the dryblend and in the ink composition, relatively large amounts of monomer can readily be obtained in the printed areas resulting in a tougher, stronger, more shrink-resistant area than would be obtainable if the monomer were in the dryblend alone or in the ink alone.
Since these polymerizable monomers all serve as solvents or plasticizers for vinyl resins, there is a limit as to how much of the monomer can be blended with the vinyl resin in any one system, such as an ink system or a dryblend system.
www.freepatentsonline.com /4068030.html   (4119 words)

 Monomers Analysis   (Site not responding. Last check: 2007-10-31)
Monomers include a wide variety of chemical compounds, including acrylates, methacrylates, long chain alkyl esters, hydroxalkyl esters, sulfones, amines, glycidyl ethers, and many other chemicals.
Monomer and polymer testing laboratories are located in Europe, Asia Pacific and North America.
Monomer, Polymer and plastics contamination issues are identified and characterised, including identification of physical and chemical defects, inorganic fillers, lubricants, gels, nibs, fish eyes, deposits, stains, particles and residue.
www.intertek-cb.com /newsitetest/news/monomersanalysis.shtml   (96 words)

VT monomer produced by Deltech Corporation is a mixture of methylstyrene isomers with approximately 55% meta and 45% para isomer distribution.
VT monomer is widely used in the coatings industry as a modifier for drying oils and oil modified alkyds.
VT monomer is used as a replacement for styrene monomer in unsaturated polyester resins (UPR) where high temperature cures combined with less shrinkage are desired.
www.deltechcorp.com /deltech02/monomers/vt.htm   (377 words)

PMS monomer produced by Deltech Corporation is suggested for evaluation as a replacement for vinyltoluene and styrene monomers.
In applications where vinyltoluene monomer is replaced by PMS monomer, property improvements related to the higher para-content and polymerizables are obtained.
Use of PMS monomer as a partial or complete replacement for styrene monomer in unsaturated polyester resin applications results in lower resin vapor pressure at any temperature and a higher flashpoint.
www.deltechcorp.com /deltech02/monomers/pms.htm   (345 words)

 Cerius2 Builders - Polymer Builder
One kind of monomer may be joined to form a homopolymer, or several types of monomer may be used to form a random or a block copolymer.
The typical orientation of monomer units in a polymer is head-to-tail, that is, the tail of the monomer being added is connected to the head of the previously added monomer.
The "type" of the grouping is typically the name of a monomer from the monomer library, and the "class" of the grouping relates to the directory from which the monomer was chosen.
www.chem.cmu.edu /courses/09-560/docs/msi/builder/6_Polymer.html   (5895 words)

 Heterocyclic monomer - PatentStorm   (Site not responding. Last check: 2007-10-31)
Disclosed is a series of the water-insoluble polymeric quaternary phosphonium salt-type bactericides, which consists of as active bactericidal components an amino quaternary phosphonium salt, a quaternary ammonium group-containing quaternary phosphonium salt, an amino quaternary phosphonium...
The monomer can have a polymerizable functional group, such as an olefinic bond, to which the acid-functionalized glycoside moiety is attached by a spacer group, for example, an alkylene...
In one embodiment, the monomer has a polymerizable functional group, such as an olefinic bond, to which the acid-functionalized glycoside moiety is attached by a spacer group, for example, an...
www.patentstorm.us /class/424/78.32-Heterocyclic_monomer.html   (2301 words)

 Specialty Monomers, AMPS Monomer
monomer: A molecule or chemical compound usually containing carbon and of relatively low molecular weight and simple structure - which is capable of conversion to polymers, synthetic resins or elastomers by combination with itself or with other similar molecules or compounds.
Low molecular weight AMPS monomer co-polymers and terpolymers are typically used to inhibit calcium, magnesium and silica scale in cooling towers, boilers, air washers and gas scrubbers commonly found in a variety of industrial manufacturing facilities today.
AMPS monomer brings numerous benefits to emulsion polymer intermediates, the backbone ingredient in formulating a variety of consumer and industrial coatings, paints, building and construction chemicals and adhesives.
www.noveon.com /products/AMPS/default.asp   (865 words)

 Monomer [Polymer Database PoLyInfo]
In PoLyInfo, the monomers are classified roughly as follows, according to their structural differences and the polymerization types.
Monomers are classified into here only for the hydrocarbon radical for R not to contain the aromatic ring where monomer has the structure of C=C-R. Halo-olefins
It is a chemical formula of monomer and mass of monomer per mol.
polymer.nims.go.jp /guide/guide-eng/term_monomer.html   (593 words)

 2242 In Vitro Diagnostic Fibrin Monomer Paracoagulation Test
Designation of this guidance document as a special control means that manufacturers attempting to establish that their device is substantially equivalent to a predicate device should demonstrate that the proposed device complies with either the specific recommendations of this guidance or some alternative control that provides equivalent assurances of safety and effectiveness.
A fibrin monomer paracoagulation test is a device used to detect fibrin monomer in the diagnosis of disseminated intravascular coagulation (nonlocalized clotting within a blood vessel) or in the differential diagnosis between disseminated intravascular coagulation (DIC) and primary fibrinolysis (dissolution of the fibrin in a blood clot).
Fibrin monomer tests are assays used to monitor the proteolytic cleavage of fibrinogen by thrombin and the resulting generation of soluble fibrin monomers.
www.fda.gov /cdrh/ode/2242.html   (673 words)

It is assumed that the buoyant molar masses of monomer and all oligomeric species are additive, which allows to calculate the oligomer diffusion coefficient using the Svedberg equation from sedimentation coefficients and oligomer molar masses.
Alternatively, the monomer and dimer sedimentation coefficients might be known, in which case the equilibrium constant can be determined from sedimentation velocity analysis.
If s and D are chosen as parameters instead of s and M (Fit M and s), an analogous box with monomer diffusion coefficient instead of monomer molar mass is used.
www.analyticalultracentrifugation.com /sedfit_help_selfassociation.htm   (1168 words)

 monomer - Search Results - MSN Encarta
Polymer, substance consisting of large molecules that are made of many small, repeating units called monomers.
Molecules of its alpha form can be joined by glycosidic bonds to form the polymers of starch and glycogen, while...
The chemical nature of a plastic is defined by the monomer that makes up the chain of the polymer.
uk.encarta.msn.com /monomer.html   (115 words)

 Monomer Sciences - oligo dt cellulose nucleosides organic chemicals USA biotech deoxy ribo
Monomer Sciences - oligo dt cellulose nucleosides organic chemicals USA biotech deoxy ribo
Since 1990 Monomer Sciences, Inc. has strived to produce the highest quality of standard and custom modified nucleosides, as well as other fine organic chemicals and custom products for the pharmaceutical and biotech industries.
A specialty of Monomer Sciences is Oligo (dT)-Cellulose, an affinity matrix used for the isolation of mRNA containing polyadenylic (poly A) regions.
www.monomer.com   (191 words)

 Vinyl CHloride Monomer Emissions From The Polyvinyl Chloride Processing Industries. Report to U. S. Environmental ...
For each process we have identified the major sources of vinyl chloride monomer loss where such information was available, or have attempted to estimate the loss based on known losses from similar processes.
The amount of vinyl chloride monomer emitted from flexible resin compounding processes is almost directly proportional to the amount of residual VCM in the input resin to the operation, since practically all, of the residual VCM in the resin is released upon compounding.
The amount of residual VCM in the incoming resin is highly variable, and dependent upon a number of factors, notably the details of the polymerization and post-stripping process, and the storage and shipping history of the resin prior to compounding.
www.mindfully.org /Plastic/VCMEmay1973-4.htm   (6336 words)

 Polymer Chemistry Glossary
Acrylonitrile is one of the more toxic monomers, and is a proven carcinogen; one of its main applications is in the production of carbon fibres.
A monomer that is polymerised along with one or more other monomers to make a copolymer.
Just as there are monomers, dimers, trimers, oligomers, and polymers, indicating one, two, three, several, and many identical units joined together in a molecule, the combinations of saccharides (aka sugars) are known as mono-, di-, tri-, oligo- and polysaccharides.
www.kcpc.usyd.edu.au /discovery/glossary-all.html   (6465 words)

 Structural Conservation between the Actin Monomer-binding Sites of Twinfilin and Actin-depolymerizing Factor ...
The residues that have been shown to be important for actin monomer and actin filament interactions in ADF/cofilins are indicated with asterisks and hash marks, respectively, above the cofilin sequence (32-34, 42).
The side chains of the residues important for actin monomer binding in these proteins are indicated by red.
The gelsolin segment-1 residues important for G-actin interaction are taken from the segment-1 actin monomer co-crystal structure (43), and the cofilin residues important for G- and F-actin interactions are taken from (32-34, 42, 44, 45).
www.jbc.org /cgi/content/full/277/45/43089   (3797 words)

 LabNotes: Monomer Purification   (Site not responding. Last check: 2007-10-31)
If the monomer to be purified has been in the refigerator, allow two (2) hours for the monomer to come to room temperature to prevent any additional water absorbtion through condensation.
Take a 4 cm diameter column (diameter may vary depending on amount of monomer to be purified) and insert cotton fibers into the lower end (stopcock) of the column.
Pour the monomer into the column carfully until the column is full (you can use a resevoir to add more monomer).
www.pslc.ws /macrog/labnotes/monfilt.htm   (533 words)

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