Cao, Kaikai;Liu, Yufeng;Yuan, Feng;Yang, You;Wang, Jin;Song, Zhicheng;Li, Zhongliang;Wu, Wei;Jiang, Mengjin;Yang, Jun published 《Preparation and properties of an aromatic polyamide fibre derived from a bio-based furan acid chloride》 in 2021. The article was appeared in 《High Performance Polymers》. They have made some progress in their research.COA of Formula: C12H12N2O The article mentions the following:
A high-mol.-weight aromatic polyamide resin incorporating furan-rings (f-resin) was prepared by low-temperature solution polycondensation of bio-based 2,5-furandiformyl chloride and 3,4′-diaminodiphenyl ether, in N,N-dimethylacetamide. Further, an aromatic polyamide fiber containing furan-rings (f-fiber) was obtained from the fresin by dry-jet wet spinning, and its structure and properties were investigated. The prepared f-resin showed good solubility and possessed good spinnability in solution The mech., heat-resistance, and flame-retardant properties of the f-fiber were found to be excellent – comparable to or exceeding those of meta-aramid fiber (m-fiber). In addition, the furan acid chloride monomer is bio-based and is derived from abundant resources, unlike petroleum-based monomers. Therefore, f-fiber has good potential and broad application prospects as an environment-friendly and sustainable high-performance material. 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. COA of Formula: C12H12N2O 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