Acar, Oktay;Varis, Serhat;Isik, Tugba;Tirkes, Seha;Demir, Mustafa M. published 《Synthesis and characterization of novel high temperature structural adhesives based on nadic end capped MDA-BTDA-ODA copolyimide》. The research results were published in《Materials Research Express》 in 2018.Product Details of 2657-87-6 The article conveys some information:
A series of novel copolyimide structural adhesives were synthesized using 4,4′-diaminodiphenyl- methane (MDA), 3,4′-oxydianiline (ODA) and 3,3′,4,4′-benzophenonetetracarboxylic acid dianhydride (BTDA) as co-monomers, and nadic anhydride as an end cap reagent. The adhesives with different MDA and ODA contents were examined in terms of their structure, thermal stability, mech. properties, and adhesive performance. They have glass transition temperatures (Tg) about 400 °C, with thermal stability up to 500 °C. The effect of diamine monomer compositions on adhesion performance and processability of the copolyimides were studied. The copolyimides exhibited adhesion strength up to 16.3 MPa at room temperature Nadic end capped MDA-BTDA-ODA copolyimide resins gained adjustable and controllable processability with the addition of ether bridged aromatic segments. The copolyimide adhesive with equimolar composition of MDA:ODA is distinguished form the both com. PMR-15 and LARC RP-46 polyimides in terms of its better processability and mech. performance. And 3-(4-Aminophenoxy)aniline (cas: 2657-87-6) was used in the research process.
3-(4-Aminophenoxy)aniline is one of ethers-buliding-blocks. Ethers feature bent C–O–C linkages. In dimethyl ether, the bond angle is 111° and C–O distances are 141 pm. The barrier to rotation about the C–O bonds is low. Product Details of 2657-87-6 The bonding of oxygen in ethers, alcohols, and water is similar. In the language of valence bond theory, the hybridization at oxygen is sp3.
Reference:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem