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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.
These are primarily derivatives of p-phenylenediamine (PPD) and work by reacting with ozone faster than it can react with vulnerable functional groups in the polymer (typically alkene groups). They achieve this by having a low ionization energy which allows them to react with ozone via electron transfer, this converts them into radical cations ...
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] This reaction converts it to the corresponding aminoxyl radical (R 2 N–O•), with the ozone being converted to a hydroperoxyl radical (HOO•), [ 2 ] these species ...
The phenylenediamine reacts with aldehydes to yield Schiff bases according to the following reaction: [9] R−CHO + H 2 N−C 6 H 4 −NH 2 → R−CH=N−C 6 H 4 −NH 2 + H 2 O. Products of this reaction are yellow to red in colour. Most β-orcinol depsidones and some β-orcinol depsides will react positively. [11]
o-Phenylenediamine (OPD) is an organic compound with the formula C 6 H 4 (NH 2) 2. This aromatic diamine is an important precursor to many heterocyclic compounds. OPD is a white compound although samples appear darker owing to oxidation by air. It is isomeric with m-phenylenediamine and p-phenylenediamine.
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.
One of the active ingredients is PPD, p-phenylenediamine, which can cause a reaction in some people.Studies have shown that less than 5% of the population may experience some allergy, [4] which can range from minor irritation, rashes and swelling to burning, [5] [6] though severe reactions are rare. [7]