Shen, Xingyuan;Connolly, Timothy;Huang, Yuhui;Colvin, Michael;Wang, Changchun;Lu, Jennifer published 《Adjusting Local Molecular Environment for Giant Ambient Thermal Contraction》. The research results were published in《Macromolecular Rapid Communications》 in 2016.Application In Synthesis of 3-(4-Aminophenoxy)aniline The article conveys some information:
A low-energy triggered switch that can generate mechanoresponse has great technol. potential. A submol. moiety, S-dibenzocyclooctadiene (DBCOD) that is composed of a flexible eight-membered ring connecting to a Ph ring at each end, undergoes a conformational change from twist-boat to chair under a low-energy stimulus such as near IR irradiation, resulting in thermal contraction of DBCOD-based polymer. Exptl. evidence corroborated by theor. calculations indicates that introducing mol. asymmetry can reduce crystallinity significantly and consequently facilitate the kinetics of the conformational change. It has been demonstrated that the neg. thermal expansion (NTE) coefficient of a DBCOD-based polymer system can be adjusted in a range from -1140 to -2350 ppm K-1. -2350 ppm K-1 is ≈10 times better than the value reported by the second best NTE system. 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 lack the hydroxyl groups of alcohols. Without the strongly polarized O―H bond, ether molecules cannot engage in hydrogen bonding with each other. Application In Synthesis of 3-(4-Aminophenoxy)anilineEthers do have nonbonding electron pairs on their oxygen atoms, however, and they can form hydrogen bonds with other molecules (alcohols, amines, etc.) that have O―H or N―H bonds.
Reference:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem