Wang, Qihua;Bai, Yongkang;Chen, Yu;Ju, Junping;Zheng, Fei;Wang, Tingmei published 《High performance shape memory polyimides based on π-π interactions》 in 2015. The article was appeared in 《Journal of Materials Chemistry A: Materials for Energy and Sustainability》. They have made some progress in their research.Safety of 3-(4-Aminophenoxy)aniline The article mentions the following:
A series of polyimides (PIs) with different chain structures were synthesized by a two-step method. The influences of chain conformations on their thermal and mech. properties were investigated by dynamic mech. anal., thermogravimetric anal., as well as by a universal testing machine. All PIs exhibited high glass transition temperature (>240 °C) and thermal decomposition temperature (>480 °C). Moreover, all these PIs could show shape memory properties more or less, especially ODA-BPDA with a shape recovery ratio (Rr) greater than 93%. The high value of Rr was mainly due to the existence of π-π interaction, a type of non-covalent interaction. The dependence of Rr on π-π interaction was investigated in detail by UV-vis spectroscopy. Finally, at. oxygen (AO) exposure experiments showed that the shape memory properties of ODA-BPDA were affected little by the erosion due to AO. To complete the study, the researchers used 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. Safety of 3-(4-Aminophenoxy)aniline 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