Polysulfide

A thermosetting resin, used as a building sealant.

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Polysulfide

a derivative of hydrogen polysulfide, H₂S_x where x = 2–9. Polysulfides are solids, ranging in color from light yellow to brownish red, with a specific, unpleasant odor.

Polysulfides of ammonia, alkali metals, and alkaline-earth metals are known—for example, potassium forms K₂S₂, K₂S₃, K₂S₄, K₂S₅, and K₂S_6. Sulfur atoms are arranged in an —S—S—S— chain in polysulfide molecules. The melting point of polysulfides is lower than that of sulfides. For example, the melting point of K₂S is 835°C, whereas that of K₂S₆ is 183°C. Polysulfides are chemically very unstable; they decompose upon heating to form sulfides. In the presence of acids they liberate H₂S_x which decomposes immediately into H₂S and S.

Polysulfides are produced by fusing sulfides, hydroxides, or carbonates with sulfur; sulfur may be added to an aqueous sulfide solution. Polysulfides of calcium and barium are used against agricultural pests. Barium polysulfide is an effective depilatory.

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[USPRwire, Thu Jul 25 2019] Sealants based on polysulfide polymers are solvent and chemical resistant, have good flexibility and adhere to various materials including steel, aluminum, concrete, glass, wood, etc.

Polysulfide sealants Market Analysis Focuses on Innovations & Opportunities Experienced Across Major

[ClickPress, Fri Jul 26 2019] Sealants based on polysulfide polymers are solvent and chemical resistant, have good flexibility and adhere to various materials including steel, aluminum, concrete, glass, wood, etc.

Polysulfide sealants Market Analysis Focuses on Innovations & Opportunities Experienced Across Major

Polysulfide sealants are widely used in construction and transportation applications, especially insulated glass window seals.

Emerald Launches VITROFLEX B Plasticizer

Peng et al., "Polysulfide shuttle control: towards a lithium-sulfur battery with superior capacity performance up to 1000 cycles by matching the sulfur/electrolyte loading," Journal of Power Sources, vol.

Determination of Cyclability of Li/Fe[S.sub.2] Batteries Based on Measurement of Coulombic Efficiency

Generally, the sheet resistance of metal is lower than that of a commercial FTO glass, but only noble metals like gold (Au) or platinum (Pt) are available as a counter electrode of QDSSCs to avoid their corrosion in polysulfide electrolyte solution.

Copper Sulfide Catalyzed Porous Fluorine-Doped Tin Oxide Counter Electrode for Quantum Dot-Sensitized Solar Cells with High Fill Factor

* Provide polysulfide toning treatment (to resist oxidation)

Keeping the legacy of trust: how to assure the longevity of earlier-generation microfilm images

"Until now, there has been no such method, but the new sulphur-limonene polysulfide addresses this urgent need."

Orange peels to combat mercury contamination

Common additives used in the process include emulsified vegetable oil or calcium polysulfide. "Essentially, [the] additives interact with the contaminants to render them less toxic or, in some cases, inert," said Elias Rodriguez, an EPA spokesman.

EPA changes cleanup plan for New Jersey's Shieldalloy site

Polysulfide Oligomer Sealants: Synthesis, Properties, and Applications

Bound sulfane sulfur is incorporated into proteins as persulfide or polysulfide, which release [H.sub.2]S under reducing conditions (see Fig.

Hydrogen sulfide and polysulfides as signaling molecules

After the Mooney viscosities have reached the maximum value, the compounds show some sort of reversion which could be linked to a change within the polysulfide linkages.

Mechanistic aspects of silane coupling agents with different functionalities on reinforcement of silica-filled natural rubber compounds

Herein, we prepared a novel carbyne polysulfide material containing a conducting carbon skeleton and energy-storing sulfur side chain without other elements by coheating carbyne and sulfur.

Carbyne polysulfide as a novel cathode material for rechargeable magnesium batteries

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