Sulfides, poly

Ammonium sulfide (colorless), (NH4)2S — saturated pass H2S through 200 mL of concentrated NH4OH in the cold until no more gas is dissolved, add 200 mL NH4OH and dilute with water to a liter the addition of 15 g of sulfur is sufficient to make the poly sulfide. 

Poly sulfide Polymers. These polymers are made up of aliphatic hydrocarbon units connected by di-, tri- or tetrasulfide links. The synthetic rubber found useful in ordn has hydrocarbon units linked by either O or formal segments. The polymers are usually prepd by the condensation of a suitable organic dihalide, usually the chloride, with aq Na polysulfide. According to Ref 8, the most practical organic dichloride is dichlorodiethylformal viz, Bis[ 2[Pg.827]

A.V. Tobolsky, Polymer Sulfur and Other Poly sulfide Polymers , ONR Tech Rept RLT-BO, Contract Nonr-1853(07), Princeton Univ, Princeton (1964) 8) Urbaiiski 3 (1967), 368-80... 

N. Anastasijevic The name of Dr. Anastasijevic is associated both to the first NEMCA study in liquids (Chapter 10), together with Baltruschat and Heitbaum, but also with the development at LURGI of a new NEMCA-based process for the production of ammonium poly sulfide (Chapter 10). Chronologically he was the first aqueous electrochemist who realized the importance and potential of NEMCA. 

Superior Environmental Products, Inc. introduced a product based on liquid poly sulfide containing 40% of a surface-modified scrap tire mbber. The product, ER-IOOR, is a coating that can temporarily contain chemical, oil, and gasoline spills. Rodriguez [97] reported that an unsaturated polyester resin containing silane-treated CGR showed better mechanical properties than that containing untreated CGR. 

The authors relate this effect to ion pairing for strongly hydrated cations such as Li which results in a decreased activity of the active (poly) sulfide at the electrode. Using Cs instead of Li not only the electrochemical kinetics but also the stability would be considerably improved ... 

Nitrobenzenediazonium salts [25910-37-6] (ion) N III N+ Sodiiun disulfide, or Sodium poly sulfide See DIAZONIUM SULFIDES AND DERIVATIVES c6h4n3o2z... 

Sealants obtained by curing polysulfide liquid polymers with aryl bis(nitrile oxides) possess stmctural feature of thiohydroximic acid ester. These materials exhibit poor thermal stability when heated at 60°C they soften within days and liquefy in 3 weeks. Products obtained with excess nitrile oxide degrade faster than those produced with equimolar amounts of reagents. Spectroscopic studies demonstrate that, after an initial rapid addition between nitrile oxide and thiol, a second slower reaction occurs which consumes additional nitrile oxide. Thiohydroximic acid derivatives have been shown to react with nitrile oxides at ambient temperature to form 1,2,4-oxadiazole 4-oxides and alkyl thiol. In the case of a polysulfide sealant, the rupture of a C-S bond to form the thiol involves cleavage of the polymer backbone. Continuation of the process leads to degradation of the sealant. These observations have been supported by thermal analysis studies on the poly sulfide sealants and model polymers (511). 

A powerful and efficient method for the preparation of poly(ketone)s is the direct polycondensation of dicarboxylic acids with aromatic compounds or of aromatic carboxylic acids using phosphorus pentoxide/methanesulfonic acid (PPMA)16 or polyphosphoric acid (PPA)17 as the condensing agent and solvent. By applying both of these reagents to the synthesis of hexafluoroisopropylidene-unit-containing aromatic poly(ketone)s, various types of poly(ketone)s such as poly(ether ketone) (11), poly(ketone) (12), poly(sulfide ketone) (13), and poly-... 

The reaction of 15 with diphenyl ether and diphenyl sulfide yields poly(ether ketone) (11) and poly(sulfide ketone) (13) with exclusively para-substituted benzene rings according to Scheme 8. 

Crystallinity of these hexafluoroisopropylidene-unit-containing poly(ketone)s is low except for poly(sulfide ketone) (13). The water contact angle for the fluorine-containing poly(ketone) films is high, being 98° for poly(ether ketone) (11), from 2,2-bis(4-carboxyphenyl)-l,l, l,3,3,3-hexafluoropropane(15) and 96° for poly(sulfide ketone) (13) from 15, whereas it is 78° for poly(ether ketone) from 2,2-bis(4-carboxy-phenyl)propane (16) and 74° for the poly(sulfide ketone) from 16. This result indicates that the substitution of isopropylidene units of poly-(ketone)s with hexafluoroisopropylidene units has a remarkable effect on the surface properties of poly(ketone) films. 

There is a long history of the preparation of explosive solids or oils from interaction of diazonium salts with solutions of various sulfides and related derivatives. Such products have arisen from benzene- and toluene-diazonium salts with hydrogen, ammonium, or sodium sulfides [1,5] 2- or 3-chlorobenzene-, 4-chloro-2-methylbenzene-, 2- or 4-nitrobenzene- or 1- or 2-naphthalene-diazonium solutions with hydrogen sulfide, sodium hydrogen sulfide or sodium mono-, di- or poly-sulfides [l]-[4,7], 4-Bromobenzenediazonium solutions gave with hydrogen sulfide at -5°C a product which exploded under water at 0°C [2], and every addition of a drop of 3-chlorobenzenediazonium solution to sodium disulfide solution... 

The blister agents are labeled H, HD, and HT. The active ingredient, mustard, in all these blister agents is bis(2-chloroethyl) sulfide, (C1CH2CH2)2S. HD, called distilled mustard, is nominally pure mustard. H, often called Levenstein mustard, is approximately 70 percent mustard and 30 per cent impurities, which tend to be poly sulfides such as (ClCH2CH2)2Sn, where n > 2. HT contains 67 per cent mustard and 22 percent T, (C1CH2CH2SCH2CH2)20, and minor components. 

NICHOLAS Scission of Poly sulfide CrosS Links... 

Zhang, L., Ma, C. and Mukerjee, S. 2005. Effect of copolymer composition on the oxygen transport properties of sulfonated poly(arylene ether sulfone) and sulfonated poly(sulfide sulfone) PEMs. Journal of the Electrochemical Society 152 A1208-A1216. 

Addition of chemical catalysts. Compounds such as anthraquinone or poly sulfide or a mixture of the two are introduced into the Kraft cooking liquor. 

Caesium selenide, 4265 Calcium poly sulfide, 3942 Calcium sulfide, 3941 Cerium trisulfide, 3967 Chromium(II) sulfide, 4245 Cobalt(II) sulfide, 4218 Copper iron(II) sulfide, 4269 Copper(II) sulfide, 4285 Europium(II) sulfide, 4293... 

Significant progress has been achieved in the identification of poly sulfides in non-aqueous solvents, mainly by application of Raman spectroscopy. However, there are... 

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