Redesigned Nylon 6 Variants with Enhanced Recyclability, Ductility, and Transparency.
Angew Chem Int Ed Engl
; 63(17): e202320214, 2024 Apr 22.
Article
em En
| MEDLINE
| ID: mdl-38418405
ABSTRACT
Geminal (gem-) disubstitution in heterocyclic monomers is an effective strategy to enhance polymer chemical recyclability by lowering their ceiling temperatures. However, the effects of specific substitution patterns on the monomer's reactivity and the resulting polymer's properties are largely unexplored. Here we show that, by systematically installing gem-dimethyl groups onto ϵ-caprolactam (monomer of nylonâ
6) from the α to ϵ positions, both the redesigned lactam monomer's reactivity and the resulting gem-nylonâ
6's properties are highly sensitive to the substitution position, with the monomers ranging from non-polymerizable to polymerizable and the gem-nylon properties ranging from inferior to far superior to the parent nylonâ
6. Remarkably, the nylonâ
6 with the gem-dimethyls substituted at the γ position is amorphous and optically transparent, with a higher Tg (by 30 °C), yield stress (by 1.5â
MPa), ductility (by 3×), and lower depolymerization temperature (by 60 °C) than conventional nylonâ
6.
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Coleções:
01-internacional
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MEDLINE
Idioma:
En
Ano de publicação:
2024
Tipo de documento:
Article