Choi, Young Chul;Kim, Min Su;Ryu, Kyoung Moon;Lee, Sang Hoon;Jeong, Young Gyu published 《Synthesis and Characterization of Aromatic Poly(azomethine ether)s with Different meta- and para-Phenylene Linkage Contents》. The research results were published in《Fibers and Polymers》 in 2020.Product Details of 2657-87-6 The article conveys some information:
New aromatic poly(azomethine ether)s (PAMEs) bearing different meta- and para-phenylene linkage ratios in the main chains were synthesized via solution polycondensation reactions of terephthalaldehyde and/or isophthaldehyde with 3,4′-diaminodiphenyl ether. The mol. structures, thermal stability, thermo-mech. and optical properties of the synthesized PAME homopolymers and copolymers were investigated by using FT-IR, TGA, DMA, and UV-visible/ fluorescence spectroscopy, resp. The synthesized PAMEs were characterized to be thermally stable up to ∼400° under nitrogen or air atm. and to have high char residues of above 55% at 800° under nitrogen condition. The DMA data revealed that the glass transition temperatures of PMAEs are in the range of 150-200°, depending on the relative contents of meta- and para-phenylene linkages. The maximum absorption wavelength of transparent yellowish PAME films was detected at 410 ±10 nm. In addition, all PAME films exhibited a broad visible emission band at 500-800 nm and two IR emission bands at 800-1400 nm. The synthesized PAMEs with high thermal stability and thermo-mech. performance can be thus used as functional polymeric materials for tech. fibers, optoelectronic films, and carbon fiber precursors.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 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