Liu, Biao et al. published new progress in experiments with the help of cas: 2657-87-6

3-(4-Aminophenoxy)aniline is one of ethers-buliding-blocks. Ethers lack the hydroxyl groups of alcohols. Without the strongly polarized O―H bond, ether molecules cannot engage in hydrogen bonding with each other. Electric Literature of C12H12N2OEthers do have nonbonding electron pairs on their oxygen atoms, however, and they can form hydrogen bonds with other molecules (alcohols, amines, etc.) that have O―H or N―H bonds.

Electric Literature of C12H12N2O《Phenylethynyl-endcapped polymerizable monomer reactants poly(amic ester) resins for high impact-toughened carbon fiber composites》 was published in 2013. The authors were Liu, Biao;Ji, Mian;Lin, Fan;Yang, Shiyong, and the article was included in《High Performance Polymers》. The author mentioned the following in the article:

Toughened polymerizable monomer reactants (PMR) poly(amic ester) matrix resins were prepared by the reaction of the diesters of aromatic dianhydrides (3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA) and/or 2,3′,3,4′-biphenyltetracarboxylic dianhydride) and aromatic diamines (the mixture of 3,4′-oxydianiline and 1,3-bis(4-aminophenoxy)benzene) in the presence of monoester of 4-phenylethynyl phthalic anhydride as the end-capping agent using ethanol as solvent. The PMR matrix resins owned the characteristic of high resin concentration and low viscosity, suitable for impregnating carbon fibers (Cfs) to give high-quality Cf prepreg. The B-staged imide oligomers prepared by thermal baking of the PMR matrix resins at the temperature of ≤240°C showed good meltability at elevated temperatures The polyimide (PI) neat resins prepared by thermally curing the B-staged oligoimide resins at 370°C showed good combined thermal and mech. properties. The Cf/PI composite (T300/PI) showed high impact toughness, with compression strength after impact of as high as 260 MPa. Unidirectional laminates had high mech. properties at room temperature and high strength retention at 250°C, with 97.4% for flexural modulus, 53.3% for flexural strength, and 48.8% for interlaminar shear strength, demonstrating that the high impact-toughened Cf/PI composite could be long-term served at a temperature as high as 250°C.3-(4-Aminophenoxy)aniline (cas: 2657-87-6) were involved in the experimental procedure.

3-(4-Aminophenoxy)aniline is one of ethers-buliding-blocks. Ethers lack the hydroxyl groups of alcohols. Without the strongly polarized O―H bond, ether molecules cannot engage in hydrogen bonding with each other. Electric Literature of C12H12N2OEthers do have nonbonding electron pairs on their oxygen atoms, however, and they can form hydrogen bonds with other molecules (alcohols, amines, etc.) that have O―H or N―H bonds.

Reference:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem