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They were first proposed as a method to help identify species by the Finnish lichenologist William Nylander in 1866. [1] Three common spot tests use either 10% aqueous KOH solution (K test), saturated aqueous solution of bleaching powder or calcium hypochlorite (C test), or 5% alcoholic p-phenylenediamine solution (P test). The colour changes ...
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 ...
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 ...
2-Propenoic acid, polymer with 2 p-propenamide, sodium salt / copolymer of acrylamide and sodium acrylate: Friction reducer 71050-62-9: 2-Propenoic acid, polymer with sodium phosphinate (1:1) No record 66019-18-9: 2-propenoic acid, telomer with sodium hydrogen sulfite: No record 107-19-7: 2-Propyn-1-ol / propargyl alcohol: No record 51229-78-8
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.
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 ]
Synthesis of benzotriazole involves the reaction of o-phenylenediamine, sodium nitrite, and acetic acid. The conversion proceeds via diazotization of one of the amine groups: [7] [8] The synthesis can be improved when the reaction is carried out at low temperatures (5–10 °C) and briefly sonicated in an ultrasonic bath. [9]
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 ]