4,4 -Diaminophenyl ether

Fang, J., Guo, X., Harada, S., Watari, T., Tanaka, K., Kita, H. and Okamoto, K. 2002. Novel sulfonated polyimides as polyelectrolytes for fuel cell applications. 1. Synthesis, proton conductivity, and water stability of polyimides from 4,4 -diaminophenyl ether-2,2 -disulfonic acid. Macromolecules 35 9022-9028. 

It should be noted that PCMU based on cross-linked macroligands possess a relatively high chemical and thermal stability. The stability of poly(enol-ketonate) chelates obtained by oxidation of thin polyvinylacetate films increases in the series of mono-, di- and trivalent ions [122], the oxidation promoting the penetration of the metal ions into the deep film layers. The weight loss of Co and Mn polychelates based on the condensation products of stoichiometric amounts of 5,5 -methylene-bis-salicylaldehyde and 4,4 -diaminophenyl ether at 300, 500, and 600 °C is 2.1, and 0.5 8.0 and 9.8 25.0 and 27.5%, respectively [14b]. The stability, in the range between 275 and 640 °C, of chelates formed by the transition metals and condensation products of p-hydroxybenzoic acid, urea and formaldehyde follow the series [123] Fe(III)>Co(II)>Cu(II)>Ni(II)>V02(II)> Zn(II) Mn(II) > CML. 

SYNS p-AMINOPHENYL ETHER 4-AMINOPHENYL ETHER BIS(p-AMINOPHENYL)ETHER BIS(4-AMINOPHENYL)ETHER DADPE 4,4 -DIAMINO-BIPHENYLOXIDE DIAMINODIPHENYL ETHER p,p -DIAMINODIPHENYL ETHER 4,4-DIAMINODI-PHENYL ETHER 4,4 -DIAMINODIPHENYL OXIDE 4,4 -DIAMINOPHENYL ETHER NCI-C50146 OXYBIS(4-AMINOBENZENE) p,p -OXYBIS(ANILINE)... 

DIAMINO-3-(PHENYLAZO)PYRIDINE MONOHYDROCHLORIDE see PDC250 4,4 -DIAMINOPHENYL ETHER see OPMOOO... 

Polypyromellitimide (PPM) n. The original polyimide family of polymers, having enhanced heat resistance and formed from polyamide carboxylic acids derived by reacting pyromellitic dianhydride with 4,4 -diaminophenyl ether. Grades of the polymer are used for forming films, paint components, and are processable as thermoplastics under special conditions. More easily processed co-polymers have enjoyed greater commercial success. 

The poly(amic acid) (V) prepared from pyromellitic dianhydride and 4,4 -diaminophenyl ether is a typical example of a high molecular weight prepolymer. The initial condensation product, poly(amic acid), is soluble in organic solvents and can be cast to films, which are subsequently cyclized to the insoluble polyimide (Vl).9... 

The outstanding property of aromatic polyimides is their thermal stability. Films of the polyimide prepared from pyromellitic dianhydride and 4,4 -diaminophenyl ether are stable in air up to about 420 C above this temperature volatilization occurs. Mechanical and electrical insulation properties are maintained after prolonged exposure to elevated temperatures for example, after 1000 hours in air at 300°C the polymer retains 90% of its initial tensile strength and 90% of its initial dielectric strength. At room temperature the physical and electrical properties of the polyimide film are comparable to those of poly(ethylene terephthalate) film. The resistance of the polyimide to most... 

The outstanding property of aromatic polyimides is their thermal stability. Films of the polyimide prepared from pyromellitic dianhydride and 4,4 -diaminophenyl ether are stable in air up to about 420°C above this tempera-... 

Technora. In 1985, Teijin Ltd. introduced Technora fiber, previously known as HM-50, into the high performance fiber market. Technora is based on the 1 1 copolyterephthalamide of 3,4 -diaminodiphenyl ether and/ -phenylenediamine (8). Technora is a whoUy aromatic copolyamide of PPT, modified with a crankshaft-shaped comonomer, which results in the formation of isotropic solutions that then become anisotropic during the shear alignment during spinning. The polymer is synthesized by the low temperature polymerization of/ -phenylenediamine, 3,4 -diaminophenyl ether, and terephthaloyl chloride in an amide solvent containing a small amount of an alkaU salt. Calcium chloride or lithium chloride is used as the alkaU salt. The solvents used are hexamethylphosphoramide (HMPA), A/-methyl-2-pyrrohdinone (NMP), and dimethyl acetamide (DMAc). The stmcture of Technora is as follows ... 

NR056X - This resin represents a modification of the NR150 series synthesized from a monomeric solution of 4,4 -hexafluoropropylidene-bis-phthalic acid, diaminobenzene, and diaminophenyl ether (mole ration 1.0/0.75/0.25) in diglyme solvent. This resin formulation in diglyme offers potential for a tough adhesive bond and improvement in processibility by removing the undesirable polar solvent NMP. The chemistry of this system is very similar to the NR150B2 system. 

In a 250 ml flask, 2,98 g of bis(p-diaminophenyl)ether was dissolved in 35 ml DMF using mechanical stirring. Then added dropwise 2,4l6 g of 3 3AA-benzophenonetetracarboxylic dianhydride (dissolved in 40 ml DMF) over a period of 100 minutes.Then 1.47 g of maleic anhydride was slowly added, maintained not over 20 C. The resulting MPE amic acid was precipitated in water, filtered and washed with water, dried.MPE amic acid was characterized by Infra-red, DSC and Elemental analysis. 

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