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p-Phenylenediamine (PPD) is an organic compound with the formula C 6 H 4 (NH 2) 2. This derivative of aniline is a white solid, but samples can darken due to air oxidation. [1] It is mainly used as a component of engineering polymers and composites like kevlar. It is also an ingredient in hair dyes and is occasionally used as a substitute for ...
6PPD is an organic chemical widely used as stabilising additive (or antidegradant) in rubbers, such as NR, SBR and BR; all of which are common in vehicle tires. [1] Although it is an effective antioxidant it is primarily used because of its excellent antiozonant performance.
An alternative is the direct reaction of nitrobenzene with aniline via a nucleophilic aromatic substitution of hydrogen (vicarious nucleophilic substitution). [ 5 ] [ 6 ] This again requires a reduction step but is a good example of industrial green chemistry as it eliminates the need for organochlorine starting materials and metal catalysts.
Phenylenediamine may refer to: o-phenylenediamine or OPD, a chemical compound C 6 H 4 (NH 2) 2; m-phenylenediamine or MPD, a chemical compound C 6 H 4 (NH 2) 2; p-phenylenediamine or PPD, a chemical compound C 6 H 4 (NH 2) 2; N,N-dimethyl-p-phenylenediamine or DMPD; N,N,N′,N′-tetramethyl-p-phenylenediamine or TMPD, used in microbiology; N,N ...
m-Phenylenediamine, also called 1,3-diaminobenzene, is an organic compound with the formula C 6 H 4 (NH 2) 2.It is an isomer of o-phenylenediamine and p-phenylenediamine.This aromatic diamine is a colourless solid that appears as needles, but turns red or purple on exposure to air due to formation of oxidation products. [3]
Wurster's blue is the radical cation of the colorless chemical N,N,N′,N′-tetramethyl-p-phenylenediamine, also known as TMPD. [1] This is an easily oxidized phenylenediamine, which loses two electrons in one-electron oxidation steps; the radical cation is a characteristic blue-violet color, which gives the compound part of its name.
N-Isopropyl-N′-phenyl-1,4-phenylenediamine (often abbreviated IPPD) is an organic compound commonly used as an antiozonant in rubbers. [1] Like other p-phenylenediamine -based antiozonants it works by virtue of its low ionization energy , which allows it to react with ozone faster than ozone will react with rubber. [ 2 ]
Dimethyl-4-phenylenediamine can be converted to methylene blue by reaction with dimethylaniline and sodium thiosulfate in several steps: [3] It is used as accelerator for the vulcanization of rubber, being first converted to the corresponding mercaptobenzothiazole.