Poly -azide

Fawcett, J. et al., J. Chem. Soc., Dalton Trans., 1980, 2294-2296 Trimethylsilyl azide reacts with excess tungsten hexafluoride in solvent to give the title compound, which explodes at 63 °C or if dried in dynamic vacuum. A deficiency of the hexafluoride gave a mixture (presumably containing poly-azides) which exploded at ambient temperature. 

Polyhydrazides can be converted to poly(azides). These polymers find application in affinity chromatography and other biochemical procedures. 

Several studies have demonstrated the successful incoriDoration of [60]fullerene into polymeric stmctures by following two general concepts (i) in-chain addition, so called pearl necklace type polymers or (ii) on-chain addition pendant polymers. Pendant copolymers emerge predominantly from the controlled mono- and multiple functionalization of the fullerene core with different amine-, azide-, ethylene propylene terjDolymer, polystyrene, poly(oxyethylene) and poly(oxypropylene) precursors [63,64,65,66,62 and 66]. On the other hand, (-CggPd-) polymers of the pearl necklace type were fonned via the periodic linkage of [60]fullerene and Pd monomer units after their initial reaction with thep-xy y ene diradical [69,70 and 71]. 

Lead azide is not readily dead-pressed, ie, pressed to a point where it can no longer be initiated. However, this condition is somewhat dependent on the output of the mixture used to ignite the lead azide and the degree of confinement of the system. Because lead azide is a nonconductor, it may be mixed with flaked graphite to form a conductive mix for use in low energy electric detonators. A number of different types of lead azide have been prepared to improve its handling characteristics and performance and to decrease sensitivity. In addition to the dextrinated lead azide commonly used in the United States, service lead azide, which contains a minimum of 97% lead azide and no protective colloid, is used in the United Kingdom. Other varieties include colloidal lead azide (3—4 pm), poly(vinyl alcohol)-coated lead azide, and British RE) 1333 and RE) 1343 lead azide which is precipitated in the presence of carboxymethyl cellulose (88—92). 

Gun Propellents. Low sensitivity gun propeUants, often referred to as LOVA (low vulnerabUity ammunition), use RDX or HMX as the principal energy components, and desensitizing binders such as ceUulose acetate butyrate or thermoplastic elastomers (TPE) including poly acetal—polyurethane block copolymers, polystyrene—polyacrjiate copolymers, and glycidyl azide polymers (GAP) to provide the required mechanical... 

As an energetic polymer, poly(glycidyl azide) (PGA) mance solid propellant binder [63,64]. For this purpose,... 

Poly-1,2-1//-azepines, produced by gas-phase photopolymerization of aryl azides yield, after oxidation, electrically conducting films.103 By photolyzing 4-(pcntyloxy)phenyl azide in the gas phase, a flexible polyazepine is produced which can be deposited directly as a thin polymer film onto a suitable surface. 

This change in editorial leadership has resulted, perhaps inevitably, in a change in editorial policy which is reflected in the contents of Volume 8. There has been a marked de-emphasis on the inclusion of organic parent compounds followed by an exhaustive and voluminous cataloging of azide, azido, azo, diazido, diazonium, diazo, nitro, dinitro, polynitro, hitr amine, nitrate (esters and salts), dinitrate, poly nitrate, nitroso, polynitroso, chlorate, perchlorate, peroxide, picrate, etc, derivatives — regardless of whether any of these derivatives exhibit documented explosive or energetic properties. Only those materials having such properties have been included in this volume... 

Refs 1) Beil — DADNBU not found DADNPE not found 2) LP. Kuhn A.C. Duckworth, The Preparation of Some New Polyfunctional Organic Azides , BRL Rept No 1607 (1972) also, the following limited distribution Addnl Ref YP. Carignan, Evaluation of Some New Poly functional Organic Azides for Propellant Applications , PATR 4592(1973)... 

Recendy, Guiver et al. reported a number of derivatives of polysulfone and poly(aryl sulfone).172 188 Polysulfones were activated either on the ortho-sulfone sites or the ortho-ether sites by direct lithiation or bromination-lithiation. The lithiated intermediates were claimed to be quantitatively converted to azides by treatment with tosyl azides. Azides are thermally and photochemically labile groups capable of being transformed readily into a number of other useful derivatives. 

It should be remarked here that trimethylsilane 84 a or triethylsilane 84 b and most other known silanes, for example tetramethyldisiloxane 1788, are quite expensive for any large-scale reduction, whereas the subsequently described poly-methylhydrosiloxane 1856 (cf. reductions of an azide moiety in 1855 and a carbo-benzoxy moiety in 1859) is available as large-scale orders for ca 15 kg , which is only a fraction of the cost of any other silane. 

See other POLY(DIMERCURYIMMONIUM) compounds See related metal azides... 

See Caesium azide Sulfur dioxide, also Poly (selenium nitride)... 

See Trimethylsilyl azide Selenium halides See also Poly (sulfur nitride) See other nitrides See related N-S COMPOUNDS... 

The endothermic nitride is susceptible to explosive decomposition on friction, shock or heating above 100°C [1], Explosion is violent if initiated by a detonator [2], Sensitivity toward heat and shock increases with purity. Preparative precautions have been detailed [3], and further improvements in safety procedures and handling described [4], An improved plasma pyrolysis procedure to produce poly (sulfur nitride) films has been described [5], Light crushing of a small sample of impure material (m.p. below 160°C, supposedly of relatively low sensitivity) prior to purification by sublimation led to a violent explosion [6] and a restatement of the need [4] for adequate precautions. Explosive sensitivity tests have shown it to be more sensitive to impact and friction than is lead azide, used in detonators. Spark-sensitivity is, however, relatively low [7],... 

Hiki S, Kataoka K (2010) Versatile and selective synthesis of click chemistry compatible heterobifunctional poly(ethylene glycol)s possessing azide and alkyne functionalities. Bioconjug Chem 21 248-254... 

Meijer, F.W., Nijhuis, S., and Vroonhoven, F.C.B.M. (1988) Poly-1,2-azepines by the photo-polymerization of phenyl azides. Precursors for conducting polymer films./. Am. Chem. Soc. 110, 7209-7210. 

A photosensitive composition, consisting of an aromatic azide compound (4,4 -diazidodi-phenyl methane) and a resin matrix (poly (styrene-co-maleic acid half ester)), has been developed and evaluated as a negative deep UV resist for high resolution KrF excimer laser lithography. Solubility of this resist in aqueous alkaline developer decreases upon exposure to KrF excimer laser irradiation. The alkaline developer removes the unexposed areas of this resist. 

The photosensitive azide compound was 4,4 -diazidodiphenyl methane (m.p. 44.0 t). The poly(styrene-co-maleic acid half ester) was used as a resin matrix. 

Phosphorus azide dilluoride-borane, 4316 Poly[borane(l)], 0134 Tetraborane(lO), 0181... 

Several explosive salts including the acetylide, azide, borate, bromate, chlorate, chromate, iodate (and ammonium iodate double salt), nitrite, perchlorate (and ammonium perchlorate double salt), periodate, permanganate, picrate and trinitrobenzoate were prepared. The 3 latter salts and the acetylide, azide and bromate are impact-sensitive detonators [1], It appears probable that many of the explosively unstable compounds [2], formed in various ways from interaction of mercury or its compounds with ammonia or its salts, may have the common polymeric structure now recognised for Millon s base [3], This is a silica-like network of N+ and Hg in 4- and 2-coordination, respectively, with OH and water in the interstitial spaces. Individually indexed compounds are Poly(dimercuryimmonium acetylide)... 

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