4-4 diamino diphenyl propane

Zur Reduktion von Harnsaure und seinen N-Alkyl-Derivaten s. S. 597 Auch 2,3-Dihydro-1,4-diazepinium-Salze werden in Athanol/Perchlorsaure an Kupfer im wesentlichen zu 1,4-Diazepanen reduziert. Wahrend beim 1,4-Diphenyl-Derivat hauptsachlich das Ringsystem erhalten bleibt, erhalt man aus dem 5,7-Diphenyl-Derivat unter Ringspaltung 1,2-Diamino-athan, 3-Oxo-l,3-diphenyl-propan und Chalkon3 ... 

Grillet et al. (1991) studied mechanical properties of epoxy networks with various aromatic hardeners. It is possible to compare experimental results obtained for networks exhibiting similar Tg values (this eliminates the influence of the factor Tg — T). For instance, epoxy networks based on flexible BAPP (2-2 - bis 4,4-aminophenoxy phenyl propane) show similar Tg values ( 170°C) to networks based on 3-3 DDS (diamino diphenyl sulfone). However, fracture energies are nine times larger for the former. These results constitute a clear indication that the network structure does affect the proportionality constant between ay and Tg — T. Although no general conclusions may be obtained, it may be expected that the constant is affected by crosslink density, average functionality of crosslinks and chain... 

Diphenyl isophthalate 3, 3w-Diamino-2,2-diphenyl-propan e-4, 4 -diol... 

Synthesis of DNTA-based PNI that are soluble in phenolic solvents and in some other organic solvents is described in [14]. Optimal PNI structures were determined by computer-aided design. As a result, 4,4 -diamino(diphenyl ether of resorcinol), 2,2-bis[4-(4-aminophenoxy) phenyl]propane (diamine A), 2,2-bis[4-(3-aminophenoxy)phenyl]propane, and 2,2-bis[4-(4-aminophenoxy)phenyl] hexafluoro-propane, were chosen as the DNTA comonomers. 

Figure 2 Relation between dissolution rate and PAA/PAE blend ratio. BTDA 3,3, 4,4-benzophenonetetracarboxylic dianhydride, DDE 4,4 -diamino-diphenyl ether, ODPA 4,4 -oxydiphthalic anhydride, DAPP 2,2-bis((3-amino-phenoxy)phenyl)propane.

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