01894nas a2200241   4500008004100000022001400041245007900055210006900134260000900203300001600212490000800228520112300236100002001359700001801379700002001397700002301417700002201440700002401462700001901486700001701505700002001522856011001542       2022                        eng d  a0002-786300aViscoelastic covalent organic nanotube fabric via macroscopic entanglement0 aViscoelastic covalent organic nanotube fabric via macroscopic en  cSEP   a16052-160590 v1443 a<p>
	Covalent organic nanotubes (CONTs) are one-dimensional porous frameworks constructed from organic building blocks via dynamic covalent chemistry. CONTs are synthesized as insoluble powder that restricts their potential applications. The judicious selection of 2,2'-bipyridine-5,5'-dicarbaldehyde and tetraaminotriptycene as building blocks for TAT-BPy CONTs has led to constructing flexible yet robust and self-standing fabric up to 3 mu m thickness. The TAT-BPy CONTs and TAT-BPy CONT fabric have been characterized by solid-state one-dimensional (1D) C-13 CP-MAS, two-dimensional (2D) C-13-H-1 correlation NMR, 2D H-1-H-1 DQ-SQ NMR, and 2D N-14-H-1 correlation NMR spectroscopy. The mechanism of fabric formation has been established by using high-resolution transmission electron microscopy and scanning electron microscopy techniques. The as-synthesized viscoelastic TAT-BPy CONT fabric exhibits high mechanical strength with a reduced modulus (E-r) of 8 (+/- 3) GPa and hardness (H) of 0.6 (+/- 0.3) GPa. Interestingly, the viscoelastic fabric shows time-dependent elastic depth recovery up to 50-70%.</p>
1 aKoner, Kalipada1 aDas, Susobhan1 aMohata, Shibani1 aDuong, Nghia, Tuan1 aNishiyama, Yusuke1 aKandambeth, Sharath1 aKarak, Suvendu1 aReddy, Malla1 aBanerjee, Rahul  uhttps://library.ncl.res.in/content/viscoelastic-covalent-organic-nanotube-fabric-macroscopic-entanglement