Hong, Weijie 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 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.

COA of Formula: C12H12N2OIn 2021, Hong, Weijie;Yuan, Lili;Ma, Yanping;Cui, Chao;Zhang, Haoyang;Yang, Shiyong;Sun, Wen-Hua published 《Resin transfer moldable fluorinated phenylethynyl-terminated imide oligomers with high Tg: structure-melt stability relationship》. 《Polymers (Basel, Switzerland)》published the findings. The article contains the following contents:

Phenylethynyl-terminated aromatic polyimides meet requirements of resin transfer molding (RTM) and exhibits high glass transition temperature (Tg) were prepared Moreover, the relationship between the polyimide backbones structure and their melting stability was investigated. The phenylethynyl-terminated polyimides were based on 4,4-(hexafluorosiopropylidene)-diphthalic anhydride (6FDA) and different diamines of 3,4-oxydianiline (3,4-ODA), m-phenylenediamine (m-PDA) and 2,2-bis(trifluoromethyl)benzidine (TFDB) were prepared These oligoimides exhibit excellent melting flowability with wide processing temperature window and low min. melt viscosities (<1 Pa·s). Two of the oligoimides display good melting stability at 280-290°C, which meet the requirements of resin transfer molding (RTM) process. After thermally cured, all resins show high glass transition temperatures (Tgs, 363-391°C) and good tensile strength (51-66 MPa). The cure kinetics studied by the differential scanning calorimetry (DSC), 13C NMR (13C NMR) characterization and d. functional theory (DFT) definitely confirmed that the electron-withdrawing ability of oligoimide backbone can tremendously affect the curing reactivity of terminated phenylethynyl groups. The replacement of 3,4-ODA units by m-PDA or TFDB units increase the electron-withdrawing ability of the backbone, which increase the curing rate of terminated phenylethynyl groups at processing temperatures, hence results in the worse melting stability. The experimental procedure involved many compounds, such as 3-(4-Aminophenoxy)aniline (cas: 2657-87-6) .

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