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The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
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Una red de polímeros supramoleculares de auto-enlace cruzado habilitada por el reconocimiento molecular basado en

Lei Wang1, Lin Cheng1, Guangfeng Li1

  • 1School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules , Shanghai Jiao Tong University , Shanghai 200240 , People's Republic of China.

Journal of the American Chemical Society
|January 7, 2020
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Resumen

Este estudio explora las redes poliméricas supramoleculares (SPN) a granel, revelando sus propiedades dinámicas y su potencial termoplástico. La comprensión de estas interacciones no covalentes avanza en el desarrollo de materiales inteligentes.

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Área de la Ciencia:

  • Química supramolecular
  • Ciencia de los Polímeros
  • Ciencias de los materiales

Sus antecedentes:

  • Los polímeros supramoleculares basados en el reconocimiento anfitrión-invitado son clave para los materiales inteligentes.
  • La investigación se ha centrado en gran medida en los estados de solución y gel, con una comprensión limitada de las propiedades a granel.
  • Las propiedades dinámicas y las aplicaciones masivas de estos polímeros siguen siendo poco exploradas.

Objetivo del estudio:

  • Investigar las propiedades a granel de las redes de polímeros supramoleculares (SPN).
  • Comprender el papel de las interacciones no covalentes en el control del comportamiento de los materiales.
  • Explorar el potencial de los SPN como una nueva clase de materiales termoplásticos.

Principales métodos:

  • Desarrollo de un SPN de autoenlace mediante el uso de fracciones huésped de benzo-21-corona-7 (B21C7) y sal de dialquilamonio.
  • Caracterización de la dinámica y la reversibilidad de la SPN mediante mediciones de viscoelasticidad.
  • Evaluación de las propiedades térmicas, incluida la transición de vidrio y la energía de activación.

Principales resultados:

  • La complejación huésped-huésped impulsa la formación de SPN con enlaces dinámicos [2] de pseudotoxano.
  • Las temperaturas elevadas mejoran la naturaleza dinámica del reconocimiento molecular huésped-invitado.
  • El SPN exhibe una alta energía de activación, característica de un material termoplástico con topología de red de transición de congelación de vidrio.

Conclusiones:

  • El estudio proporciona información fundamental sobre las propiedades masivas de los SPN controlados por interacciones no covalentes.
  • Los hallazgos demuestran la maleabilidad y procesamiento de los SPN, destacando su potencial como materiales termoplásticos.
  • Esta investigación facilita el avance y la aplicación de materiales supramoleculares a granel.