• #11 Condensation Polymerization: Preparation of Thiokol ...

    Condensation Polymerization: Preparation of Thiokol (Polysulfide Rubber) Scenario. Along with the economics of manufacturing a chemical, its physical and chemical properties will dictate its end-use applications. A major chemical company has contracted the research company you work for to develop polysulfide coatings and sealants for tanks and ...

  • Equilibrium Distribution of Polysulfide Ions in Aqueous ...

    This method resolves the dispute over the existence of hexasulfide in aqueous solutions and establishes the presence of even higher polysulfide chains in water. The Gibbs free energies of formation ( ) for the polysulfide species are 77.4, 71.6, 67.4, 66.1, 67.2, 70.5, and 73.6 kJ/mol for n = 2−8, respectively.

  • Sodium polysulfide - Wikipedia

    Sodium polysulfide can be produced by dissolving sulfur in a solution of sodium sulfide. Alternatively they are produced by the redox reaction of aqueous sodium hydroxide with sulfur at elevated temperatures. Finally they arise by the reduction of elemental sulfur with sodium, a reaction often conducted in anhydrous ammonia.

  • Sodium polysulfides Na2Sn Reactions

    SODIUM POLYSULFIDES Na2Sn. Reactions with sodium polysulfides na2sn. Obtaining sodium polysulfides Na2Sn. Properties:A mixture of Na2(Sn) (n = 2, 4, 5) has a yellow-brown color, Na2S2 - yellow.

  • Aliphatic compound - Wikipedia

    Aliphatic compounds can be saturated, joined by single bonds, or unsaturated, with double bonds or triple bonds . Besides hydrogen, other elements can be bound to the carbon chain, the most common being oxygen, nitrogen, sulfur, and chlorine. The least complex aliphatic compound is methane (CH 4). Properties

  • aliphatic compound | Definition & Examples | Britannica.com

    Aliphatic compound, any chemical compound belonging to the organic class in which the atoms are connected by single, double, or triple bonds to form nonaromatic structures. One of the major structural groups of organic molecules, the aliphatic compounds include the alkanes, alkenes, and alkynes and

  • Corrosionpedia - What is an Aliphatic Solvent? - Definition ...

    Since aliphatic solvents are considered to be alphatic compounds, they contain carbon and hydrogen joined together in straight chains, branched trains or non-aromatic rings. The hydrocarbons of the alkane, alkene and alkyne series are aliphatic compounds, as are fatty acids and many other compounds.

  • Nucleophilic Aliphatic Substitution - an overview ...

    The basic polymerization reaction is an aliphatic nucleophilic substitution reaction and a variety of difunctional reagents such as tosylates, sulfates and thiosulfates and even gem-dinitrates have been reacted with alkali polysulfides to form polymers. In some cases there are advantages to using these reactants, but the availability and ...

  • Petroleum Ether Aliphatic hydrocarbon mixture CAS No.: see ...

    Petroleum Ether Aliphatic hydrocarbon mixture CAS No.: see synonyms Synonyms and CAS Numbers: naphtha 8002-05-9, VM&P naphtha 8032-32-4, rubber solvent 8030-30-6, Stoddard solvent 8052-41-3, petroleum thinner 64742-89-3. Other synonyms: Ligroin, mineral spirits, white spirits, safety solvent, SBP spirits, painter's n aphtha.

  • MS 918 - Epoxide and Ether Practice | MendelSet

    In this case, the ether was cyclic, so the ring had to open up. The reaction can go through either an S N 1 or S N 2 mechanism. Since this was a primary ether, it will go through an S N 2 mechanism (the carbocation is too unstable for the reaction to go S N 1). Problem Details

  • (PDF) Inorganic and Organic Hybrid Nanoparticles as ...

    aliphatic ether polysulfide as the organic phase supported on the silica su rface could effectively improve interfacial interaction between the filler and rubber matrix [21]. In addition, during the

  • How do you prepare sodium polysulfide Na2Sx in aqueous solution?

    How can I easily prepare the sodium polysulfide Na 2 S x, preferrably in aqueous solution? ... ( x = 2,3,4,5,6 ) solution and so based on your reaction the polysulfide you wish to get will react.

  • Sodium sulfide | Sigma-Aldrich

    • obtain aliphatic and alicyclic γ-keto, γ,γ*-diketo, bis sulfides, thiamono-, and thiabicyclanes by alkylthiomethylation of ketones • improve myocardial and endothelial function in a canine model of cardiopulmonary bypass • to study the cytoprotective and anti-inflammatory effects of hydrogen sulfide in macrophages and mice

  • ALIPHATIC AND AROMATIC ETHERS (JECFA 52, 2004)

    Aliphatic and aromatic ethers have been detected in a variety of foods including fruits, vegetables, alcoholic beverages, coffee and tea (Maarse et al., 1999). The ether with the highest annual volume of production, eucalyptol (No. 1234), is widely distributed in the plant kingdom (see Table 3).

  • © Professor Kathleen V. Kilway and Robert Clevenger, Depart ...

    solvent is important because "like dissolves like." So if the extraction is from an aqueous solution, we do not want a solvent that is miscible with water. Thus during the extraction two layers are formed, aqueous and organic. It is important to know the density of the solvent so that we can predict which one is the organic layer.

  • Sulfide containing aliphatic epoxy resins - The Dow Chemical ...

    The reaction is suitably carried out by heating the aqueous sulfide or polysulfide solution from about 25° to about 90° C., suitably from about 50° C. to about 80° C., and adding the polyfunctional organic compound(s) and the hydroxyalkyl compound(s) over a period of about 5 minutes to about 2 hours.

  • Reactions of Ethers - CliffsNotes

    This reaction proceeds via a nucleophilic substitution mechanism. Primary and secondary alkyl ethers react by an S N 2 mechanism, while tertiary, benzylic, and alcylic ethers cleave by an S N 1 mechanism. A typical S N 2 reaction would be the reaction of ethylisopropyl ether with HI. The mechanism for this reaction is:

  • What is an Aliphatic Ester? - Definition, Synthesis & Solvent ...

    The term aliphatic means that there are only carbon-carbon single bonds present, and an ester is a functional group in organic chemistry in which a carbon atom contains a double bond to an oxygen ...

  • Aliphatic Ether | OChemPal

    An aliphatic ether is an ether in the molecule of which there are no aryl groups on the ether group.. eg: An ether molecule may contain aryl groups, nevertheless, be an aliphatic ether.

  • On the Way Toward Understanding Solution Chemistry of Lithium ...

    Here, the fundamental understanding and control of lithium polysulfide chemistry are studied to enable the development of liquid phase Li–S redox flow prototype cells. These differ significantly from conventional static Li–S batteries targeting for vehicle electrification.

  • Aryl amine terminated polysulfide polymers, related compounds ...

    Fully and partially aryl amine terminated polysulfide polymers and processes for their preparation and use are disclosed. The fully aryl amine terminated products are curable with isocyanates to high molecular weight polymers and are thus useful in molding and casting as well as in sealants.

  • Kinetics of the chemical oxidation of polysulfide anions in ...

    The kinetic properties of the chemical oxidation of aqueous polysulfide solutions have been studied in phosphate-buffered systems at pH 7–12, at temperatures between 20 and 40 °C, and ionic strength between 0.05 and 0.50 M. Polysulfide solutions were mixed with a buffer solution of known dissolved oxygen concentration, after which the decrease in the oxygen concentration of the solution was ...

  • Aliphatic Hydrocarbons: Definition & Properties Video with ...

    Learn about aliphatic hydrocarbons and discover where you can find these types of compounds in everyday life. Understand the definition and properties of aliphatic hydrocarbons.

  • US5434225A - Amine-unsaturated epoxidized polysulfide ...

    An epoxy resin adhesive, sealing or coating composition containing as a curing agent an addition product of A) at least one member of the group consisting of primary amines and secondary amines and B) at least one ester having a formula selected from the group consisting of ##STR1## wherein m is 0 or 1, n is an integer from 3 to 25, 0 is an integer from 1 to 20, p is an integer from 1 to 10, R ...

  • US3499863A - Air-curable polysulfide-polyurethane sealants ...

    A polysulfide-polyurethane air-curable sealant and coating composition comprising a prepolymer of the structure wherein R is a member selected from the group consisting of arylene and alkylene radicals, R and R" are the same members selected from the group consisting of aliphatic hydrocarbon and aliphatic ether radicals having up to 26 carbon ...

  • Aliphatic Hydrocarbon - Chemistry Definition

    An aliphatic compound is a hydrocarbon compound containing carbon and hydrogen joined together in straight chains, branched trains or non-aromatic rings. Aliphatic compounds may be saturated (e.g., hexane and other alkanes) or unsaturated (e.g., hexene and other alkenes, as well as alkynes).

  • Isocyanato-terminated Polysulfide Polymers And ... - The Lens

    Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99( 1) European patent convention). Courier Press, Leamington Spa, England. -- PatentLens OCR page0002.txt 0025 272 Isocyanato-terminated polysulfide polymers and processes for their prepaL on.

  • 10 Reactions of Alcohols, Ethers, Epoxides, Amines, and

    Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing Compounds 10 Chemists search the world for plants and berries and the ocean for flora and fauna that might be used as the source of a lead compound for the development of a new drug. In this chapter, we will

  • First-Principles Investigation of Lithium Polysulfide ...

    First-Principles Investigation of Lithium Polysulfide Structure and Behavior in Solution Ethan P. Kamphaus and Perla B. Balbuena * Department of Chemical Engineering, Texas A&M University, College Station, Texas 77843, United States

  • Aliphatic ether polysulfide (Vulcanizator VA-7)

    Aliphatic ether polysulfide (Vulcanizator VA-7) Chemical name: Aliphatic ether polysulfide Structural formula: Properties: It is yellow sticky liquid, with light thioalcohol odor. Specific gravity: 1.42-1.47. Viscosity: about 5-10 pa.s at 26.7 °C. Functions: VA-7 is vulcanizator for NR, SBR, NBR and other unsaturated rubber. It can easily ...

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