Diamino diphenylmethane

Based on the above studies, the identity of the diisocyanate component in BPUla was deduced by the presence of fragments at ra/z 250 [methylene-bis(4)phenyl-isocyanate] (MDI), 224 (4-amino-4 -iso-cyanato-diphenylmethane), and 198(diamino-diphenylmethane).27 The presence of the diamine, as the chain extender was evident from the presence of the fragments m/z 324, assignable to 1,l -bisCB-iso-jg cyanatoethyl)ferrocene, and 298, assignable to the structure 10. 

As a representative example of cure monitoring using a common commercially used aerospace resin and a complex cure cycle, Figure 4.6 displays the output of epoxy system. This resin consists of a tetraglycidyl 4,4 -diamino diphenylmethane (TGDDM) and diamino diphenyl sulfone (DDS). This system with catalyst is sold by the Hercules Corporation as 3501-6. 

In the second stage, the above prepolymer is prereacted with liquid epoxide resin in the presence of benzyltrimethylammonium chloride as a catalyst. The crosslinking occurs as a result of the reaction of the remained epoxy groups with 4,4 -diamino-diphenylmethane added [90]. 

As in the cyanate/epoxide compositions, polysulfone is used as an additive in cyanate/epoxide/maleimide systems. As an example, a composition for carbon-fiber composites should be mentioned. It contains BPA/DC-BMI prepolymer, epoxide resin and polyethersulfone [111-113] Zn acetate and dicumyl peroxide are added. Polyethersulfone powder was added to the three-component system with 4,4 -diamino-diphenylmethane-based tetraepoxide as one of the epoxy resins used [114]. 

Although 3,8-diamino-l ll/-dibenzo(c,/)-l,2-diazepine-5-oxide [67, R = NH2, and 67, R = N(CH3)2] were first prepared in 190651 52 by reduction of 2,2 -dinitro-4,4 -diaminodiphenylmethane with zinc dust and ammonium chloride and subsequent air oxidation in basic medium, the ring system has not received any attention until recent years. The dibenzo compounds (67, R = C1, Br, and I) were first prepared by the same method.53 The parent diazepine (68, R = H)54 and the dihalodiazepines (68, R = F, Cl, Br, and I)53 have been prepared by lithium aluminium hydride reduction of the appropriate 2,2 -dinitrodiphenylmethane. In the case of the reduction of 2,2 -dinitro-4,4 -diiododiphenylmethane, either 68 (R = H) or 68 (R = I) could be obtained depending upon the amount of reducing agent used. Attempts to prepare the system 68 by oxidation of 2,2 -diamino-diphenylmethanes led to inconclusive results.55... 

Before coupling, excess nitrous acid must be destroyed. Nitrite can react with coupling components to form nitroso compounds causing deliterious effects on the final dyestuff. The presence of nitrite can be detected by 4,4,-diamino-diphenylmethane-2,2,-sulfone [10215-25-5] (Green reagent) or starch—iodide. Removal of nitrite is achieved by addition of sulfamic acid or urea [57-13-6], however, sulfamic acid [5329-14-6] has been more effective in kinetic studies of nine nitrous acid scavangers (18). 

Trippel-Schulte P, Zeiske J, Kettrup A. 1986. Trace analysis of selected benzidine and diamino-diphenylmethane derivates in urine by means of liquid chromatography using precolumn sample preconcentration, UV and electrochemical detection. Chromatographia 22(1-6)138-146. 

The photolysis of 1 l//-dibenzo[c/][l,2]diazepine in acidified EtOH has given the corresponding dibenzodiazepin-ll-one and minor amounts of 2,2 -diaminobenzophenone and 2,2 -diamino-diphenylmethane <67AJC2229>. Similar treatment of the 3,8 -dichloro- and 3,8 -dibromo-ll/7-dibenzodiazepines, in the same solvent, also affords their 11-ethoxy derivatives (68), which adds support to the proposed photoinduced intermolecular hydride-transfer mechanism <91JIC299>. 

Density g cm 4,4 -Diphenylmethane diisocyanate (MDI)/polyether polyol/ 4,4 -diaminodiphenyl methane (MDA) MDl/polyether polyol/diethyl toluene dicunine (DETDA) MDl/ polyether polyol/ 3-chloro-3 methoxy-4,4 diamino diphenylmethane (CMOMDA) 0.96 0.98 0.94 (1)... 

Fig. 21 Comparison of fracture surfaces of (a) neat diethyltoluene diamine cured tetraglycedyl diamino diphenylmethane resin system (top) and (b) its corresponding nanocomposite containing 7.5% octadecyl ammoninm modified layered silicate...

Gailhofer G, Ludvan M (1989) Zur Wertigkeit positiver Epikutantestreaktionen auf 4,4 -Diamino-diphenylmethan. Dermatosen 37 17-22... 

PUs are formed as a result of a condensation or an adduction reaction between isocyanates and polyols [polyesters or polyethers with terminal hydroxyl (OH) groups, castor oil or tall oil]. If both components are more than difunctional, thermosetting end products are produced. Many auxiliary substances are also used in the manufacture of PU products. The hardening process can be modified by heat or with a catalyst [diamino diphenylmethane or meth-ylenedianiline (MDA), triethylenediamine, triethyl-amine, cobalt naphthenate or nickel salts]. Figure 1... 

Finally, a synthetic approach should be mentioned yielding polyamides containing cyclic OESs as part of the repeating unit [78]. The cyclic dicarboxylic acid (53c) was prepared from (53a) and (53b) by a conventional procedure and polycondensed with 4,4 -diamino-diphenylmethane using the triphenylphosphite-pyridine method. 

This limitation is overcome when the elastomer is cast from a mixture consisting of a linear polyester or poly ether, diisocyanate and glycol or diamine. In this process, the hydroxy-terminated polymer (e.g., poly(ethylene adipate) or poly(oxytetramethylene) glycol) is treated with an excess of diisocyanate (e.g., naphthylene 1,5-diisocyanate, tolylene diisocyanate or diphenylmethane 4,4 -diisocyanate). The product is a pre-polymer which is, in effect, a mixture of isocyanate-terminated polymer and unreacted diisocyanate. The pre-polymer is then mixed with either a glycol (e.g., 1,4-butanediol or 1,6-hexanediol) or diamine (which is usually a deactivated amine such as 3,3 -dichloro4,4 -diamino-diphenylmethane (MOCA)). The mixture is poured into a heated mould where it quickly sets. After about 30 mins the casting is removed from the mould and cured at about 110°C for 24 hours. 

Synonyoe 4,4 MethylenebiB[benzenaminel p,p -diamino-diphenylmethane Trade names ... 

An extremely large variety of resins exist which allows the fine-tuning of the processing and/or the characteristics of the final material. For instance, N,N -tetraglycidyl-4,4 diamino-diphenylmethane that carries tertiary amino groups ensures the self-catalysis of the cross-linking process. 

Resol Single Tg 1 was made from rosin maleic anhydride Diels-Alder adduct with 4,4 -diamino-diphenylmethane 468... 

Diaminodiphenylmethane reacted with HN03 and as a result of this reaction 4,4-diamino-2,2-dinitro-diphenylmethane was obtained. 

C HgiNsOa 2 Nitro-4>ainino-a-o toluidino 3-methyl diphenylmethan 13, 255. 4"-Nitro 4.4 aiamino-3.3 -dimethyl-triphenylmethan 13, 284. 8" NItm 6.8 -diamino-3.3 -dimethyl triphenylmethan 18, 285. 4 NitrO 6.6 -diammo-3.3 dimethyl-triphenylmethan 13, 285. oc Phenylhydrazlno Q( oxy phenyless s ure>... 

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