P-Phenyl diamine

Epoxy-resins picryl chloride or chlor-2-4-dinitrobenzene p-phenyl diamine. Isocyanates proteolytic enzymes p henylene diamine complex salts of platinum cyanuric chloride. 

Epoxy-resins picryl chloride or chlor-2-4-dinitrobenzene p-phenyl diamine. 

Since the commercialization of Nomex and Kevlai a great number of PAs have been reported that covers a wide rage of properties. However the properties of Kevlar , the PA fibre made from terephthalic acid and p-phenyle diamine are still unique in terms properties-price balance. Thus all the efforts dedicated to design and produce novel aromatic PAs have concentrated to improve the... 

Stabilisers are usually determined by a time-consuming extraction from the polymer, followed by an IR or UV spectrophotometric measurement on the extract. Most stabilisers are complex aromatic compounds which exhibit intense UV absorption and therefore should show luminescence in many cases. The fluorescence emission spectra of Irgafos 168 and its phosphate degradation product, recorded in hexane at an excitation wavelength of 270 nm, are not spectrally distinct. However, the fluorescence quantum yield of the phosphate greatly exceeds that of the phosphite and this difference may enable quantitation of the phosphate concentration [150]. The application of emission spectroscopy to additive analysis was illustrated for Nonox Cl (/V./V -di-/i-naphthyl-p-phcnylene-diamine) [149] with fluorescence ex/em peaks at 392/490 nm and phosphorescence ex/em at 382/516 nm. Parker and Barnes [151] have reported the use of fluorescence for the determination of V-phenyl-l-naphthylamine and N-phenyl-2-naphthylamine in extracted vulcanised rubber. While pine tar and other additives in the rubber seriously interfered with the absorption spectrophotometric method this was not the case with the fluoromet-ric method. 

Antiozonant additives are employed with unsaturated rubbers such as natural rubber, nitrile rubber, styrene-butadiene rubber, etc., to minimise the atmospheric ozone degradation reaction. Common antiozonant types include the parapheny-lene diamines such as N-(l,3-dimethylbutyl)-AT-phenyl-p-phenylene diamine (6PPD) and N-isopropyl-N7 phenyl-p-phenylene diamine (IPPD). Both these antioxidants can be identified and quantified using GC- or LC-based techniques. 

Imines 268 (Ar = phenyl, p-anisyl, p-chloro-phenyl) are dimerized on heating in aprotic solvents to give the yellow tetraphenyl p-benzoquinone imines 267 and (or) their reduction products, the colorless p-phenylene diamine derivatives 270ss ... 

Of course, this re-equilibration behavior of two homopoly(amic acids) can be eliminated if one of the components does not exhibit this back reaction. Recombination of different fragments is not possible and stable polyimide precursor blends are accessable [119]. For example, combining a relatively flexible poly(amic acid), hexafluoroisopropylidene diphthalic anhydride (6F)/2,2-bis(4-aminophenoxy-4 -phenyl) propane (BDAF), with a rigid poly(amic alkyl ester), PMDA/p-phenylene diamine (PDA), produced microphase separated polyimide blends as can be interred by the persistence of the... 

Chloride, (H3C)2N.CGH4.N( N).Cl, mw 183.64, N 22.88% pale-yel crysts (from ale + eth), mp — puffs off at ca 130° sol in cold w in ale insol in eth decumpd by hot w. Hantzsch (Refs 1 2) prepd it hy the low-temp diazotization of N -dinethyl-p-phenyl-enediamine with Na nitrite, while Stolle (Ref 4) treated N,N-dimethyl-p-phenylene-diamine hydrochloride with amyl nitrite in alcoholic medium... 

Akroflcx C [Du Pont], TM for a rubber antioxidant containing 35% di phenyl-p-phcnylcne-diamine C6H4(NHC6H5)2 and 65% phenyl-a-naph-thylamine ( Neozone A). 

N,N, P - phenylcyclohexil - p - phenylene diamine N,N, P - diphenyl - p - phenylene diamine and phenyl - P - naphthylamine conserve strength of PA - fibres by 70-95% at it warming up for 2 hours at 200 ° C (unstabilized fibre - 22%). Despite high inhibitive activity their use is limited, as intermediate products of their transformations dye polymer. 

Crosslinking Perfluorophenoxy-Containing Elastomers. Vulcanization of the perfluoroelastomer containing a phenoxy group may be carried out several ways. One method uses diamines such as p-phenyl-enediamine, tetraethylenepentamine, or hexamethylenediamine carbamate (Du Pont DIAK No. 1) (3). A typical recipe is shown in Figure 8. 

IV-phenyl-IV-(1,3-dimethyl-butyl)-p--p henylene diamine [793-24-8] C18H24N2 (10) RU Akron Chemical Co. Goodyear Tire and Rubber Co. Mobay Chemical Co. Monsanto Co. Pennwalt Corp. R T. Vanderbilt Co., Inc. Uniroyal Chemical UOP, Inc. 

IV-phenyl-IV-cyclohexyl-p-phenyle ne diamine [101-87-1] 18 22 2 RU Uniroyal Chemical R T. Vanderbilt Co., Inc. 

Aromatic amines, which are derived from p-phenylenediamine and dipheny-lamine and are more effective than phenolic antioxidants for unsaturated elastomers. A-phenyl-A-(l,3-dimethylbutyl)-p-phenylene diamine is also an effective stabilizer in the presence of ozone. 

N-(1.3-dimethylbutyl)-N -phenyl-p-phenyltaie diamine NJl diphenyl-p-phtaryltaie diamine 6PPD heavily staining... 

To extend the operation period of prolinamide-derived IL-supported catalysts, bis-amides 58a-e were synthesised from (25, 4R)-4-hydro yproline and various diamines. C2-Symmetric compounds 58c-e bearing p-phenyle-nediamine, l,2-diaminocyclohexane or 1,2-diphenyl ethylenedia-mine ° structural units exhibited excellent catalytic performance in asymmetric cross-aldol reactions between ketones 8 and aldehydes 9 in the aqueous medium and could be recycled 15 times without any decrease of activity or loss of enantiocontrol. Furthermore, bis-amide 58e efficiently catalysed aldol reactions of acetone with a-ketoesters 62 to afford a-hydrojqr-y-ketoesters 63 in a nearly quantitative yield, yet with moderate enantioselectivity (Scheme 10.14). 

Although no ideal method exists, at present, that can distinguish between free and combined chlorine without interference, analytical methods based on amperometry and the use of N,N-diethyl-p-phenyl-ene diamine (DPD) are the most frequently employed in water analysis. With both of these methods, FAC is first determined in the absence of iodide (I ). Iodide can then be added to the solution, and the iodine (present as triiodide ion, 13 ), formed from the oxidation of iodide by combined chlorine, is determined. 

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