phenylenediamine


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phenylenediamine

[¦fen·əl‚ēn′dī·ə‚mēn]
(organic chemistry)
C6H4(NH2)2 Also known as diaminobenzene. Any of three toxic isomeric crystalline compounds that are diamino derivatives of benzene; the ortho form, toxic colorless crystals melting at 102-104°C and soluble in alcohol, ether, water, and chloroform, is used to manufacture dyes, in photographic developers, and as a chemical intermediate; the meta form, colorless crystals unstable in air, melting at 63°C, and soluble in alcohol, ether, and water, is used to manufacture dyes, in textile dyeing, and as a nitrous acid detector; the para form, white to purple crystals melting at 147°C, soluble in alcohol and ether, and irritating to the skin, is used to manufacture dyes, in chemical analysis, and in photographic developers.
References in periodicals archive ?
Included is a rubber composition for tires, including: a rubber component; a phenylenediamine antioxidant; and a masterbatch, the masterbatch containing a specific nonionic surfactant and a silica having a BET value of 40-250 [m.sup.2]/g at a mass ratio of 1:5 to 1:0.15, the rubber component containing a diene rubber in an amount of 70-100% by mass per 100% by mass of the rubber component, the rubber composition including, per 100 parts by mass of the rubber component, 1.0-10.0 parts by mass of the phenylenediamine antioxidant and 0.1-5.0 parts by mass of the nonionic surfactant introduced in the form of the masterbatch.
She said that strict action would be taken over acid throwing while section 144 would be imposed to control the usage of black stone (phenylenediamine) in South Punjab and there would be ban of transportation, sale and storage of black stone.
The role of the antioxidant ascorbic acid in the elicitation of contact allergic reactions to p- phenylenediamine. Contact dermatitis 2016; 74(5): 267-72.
ME+ is the result of more than 20 years of research and the screening of hundreds of molecules to find a replacement for the existing hair color dye molecules, PPD (phenylenediamine) and PTD (toluenediamine).
Quotations are invited for Purchase Of N,N - Diethyl - P - Phenylenediamine (Dpd) Reagent Set To Determine Free Residual Chlorine By Dpd Method At Bhandup Complex Laboratory Document cost : INR 175 EMD value : INR 5800 Opening date : 04 May 2018 Period of contract : 90 DAYS
For instance, Pearson and Hwang were pioneers in the field and reported many TAPD-based chemosensors formed by crown ethers as ionophore sites and phenylenediamine moiety as a transducer capable of detection of alkaline or alkaline earth cations [12].
Co-polymerization of p-aminophenol and p- phenylenediamine at carbon and titanium electrodes:
However, they still contain some phenylenediamine or PPD, just a lower level."
The cause was PPD, phenylenediamine, a chemical which is used extensively in hair dye and which street traders were using mixed with convential henna because it was cheaper and produced faster results.
The breakthrough new molecule (ME+) was specifically developed to reduce the risk of new color allergies, according to Coty, and is the result of more than 20 years of research and the screening of hundreds of molecules to find a replacement for the existing hair color dye molecules, PPD (phenylenediamine) and PTD (toluenediamine).
Quotations are invited for Supply Of Silver Paste, Gmbs (N-Maleimidobutyryloxysuccinimide), 25 Mg, Sigma (2 Nos.), Zink Nitrate Hexahydrate, Sigma (500 G, 2 Nos.),(Bovine Serum Albumin, Sigma, Ortho Phenylenediamine, Srl (5 Grm),Double Door Refrigerator (240 L, Godrej), Wafer Handling Tweezers(Anti-Acid Steel).
The mechanism of dyeing is mainly related to the staining properties of constituent lawsone, and modified henna products such as black henna are available by adding para- phenylenediamine (PPD) to henna powder.