Anion-Coordination Foldamer-Based Polymer Network: from Molecular Spring to Elastomer.
Angew Chem Int Ed Engl
; 63(27): e202400989, 2024 Jul 01.
Article
en En
| MEDLINE
| ID: mdl-38623921
ABSTRACT
Foldamer is a scaled-down version of coil spring, which can absorb and release energy by conformational change. Here, polymer networks with high density of molecular springs were developed by employing anion-coordination-based foldamers as the monomer. The coiling of the foldamer is controlled by oligo(urea) ligands coordinating to chloride ions; subsequently, the folding and unfolding of foldamer conformations endow the polymer network with excellent energy dissipation and toughness. The mechanical performance of the corresponding polymer networks shows a dramatic increase from P-L2UCl (non-folding), to P-L4UCl (a full turn), and then to P-L6UCl (1.5 turns), in terms of strength (2.62â
MPa; 14.26â
MPa; 22.93â
MPa), elongation at break (70 %; 325 %; 352 %), Young's modulus (2.69â
MPa; 63.61â
MPa; 141.50â
MPa), and toughness (1.12â
MJ/m3; 21.39â
MJ/m3; 49.62â
MJ/m3), respectively, which is also better than those without anion centers and the non-foldamer based counterparts. Moreover, P-L6UCl shows enhanced strength and toughness than most of the molecular-spring based polymer networks. Thus, an effective strategy for designing high-performance anion-coordination-based materials is presented.
Texto completo:
1
Base de datos:
MEDLINE
Idioma:
En
Revista:
Angew Chem Int Ed Engl
Año:
2024
Tipo del documento:
Article