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[4] The energy released in the reaction of sodium and elemental sulfur is the basis of battery technology. The sodium–sulfur battery and the lithium–sulfur battery require high temperatures to maintain liquid polysulfide and Na + -conductive membranes that are unreactive toward sodium, sulfur, and sodium sulfide.
In 1838, Swiss chemists reported the preparation of hydrophobic rubbery materials by the alkylation of sodium polysulfide with 1,2-dichloroethane. [2] In 1926 chemists Joseph C. Patrick and Nathan Mnookin further developed this class of materials, which first achieved commercial success as sealants for fuel lines, exploiting the solvent resistance of these materials.
The species S x 2−, called polysulfide anions, include disulfide (S 2 2−), trisulfide (S 3 2−), tetrasulfide (S 4 2−), and pentasulfide (S 5 2−). In principle, but not in practice, the chain lengths could be longer. [1] [2] The salts are dark red solids that dissolve in water to give highly alkaline and corrosive solutions.
— "Values ranging from 21.3 to 21.5 gm/cm 3 at 20 °C have been reported for the density of annealed platinum; the best value being about 21.45 gm/cm 3 at 20 °C." 21.46 g/cm 3 — Rose, T. Kirke. The Precious Metals, Comprising Gold, Silver and Platinum .
Sealant is a substance used to block the passage of fluids through openings in materials, [1] a type of mechanical seal. In building construction sealant is sometimes synonymous with caulk (especially if acrylic latex or polyurethane based) [ 2 ] and also serve the purposes of blocking dust, sound and heat transmission.
4 Standard Test Methods for Thermoplastic Elastomers-Tension. ASTM : D 412-1992 (H) HYSD BARS; 1 Specifications for HYSD bars. IS 1786 – 1985 2 Specification for Mild Steel and Medium Tensile steel bars. IS 432 (P II) 1966 3 Method for Tensile testing of steel wires. IS 5121 – 1972 4 Hard drawn steel wire for concrete reinforcement. IS 1566 ...
Bis(4-fluorophenyl)sulfone can be used in place of bis(4-chlorophenyl)sulfone. The difluoride is more reactive than the dichloride but more expensive. Through chain terminators (e.g. methyl chloride), the chain length can be controlled for melt-processing. The diphenol is typically bisphenol-A or 1,4-dihydroxybenzene. Such step polymerizations ...
Na 2 S 4 + 2 ClC 3 H 6 Si(OEt) 3 → S 4 [C 3 H 6 Si(OEt) 3] 2 + 2 NaCl Bis(triethoxysilylpropyl)tetrasulfide is a bifunctional molecule in that it contains two kinds of reactive functional groups . The tetrasulfide group is a polysulfide , which means that it consists of a chain of sulfur atoms.
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