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Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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Vitrímeros de copolimero de bloque

Jacob J Lessard1, Georg M Scheutz1, Seung Hyun Sung2

  • 1George and Josephine Butler Polymer Research Laboratory, Center of Macromolecular Science, Department of Chemistry , University of Florida , Gainesville , Florida 32611 , United States.

Journal of the American Chemical Society
|December 4, 2019
PubMed
Resumen
Este resumen es generado por máquina.

Los copolímeros de bloque combinados con los vitrímeros ofrecen control a nanoescala sobre el flujo y la deformación. Esta nueva clase de vitrímeros de bloque muestra una mayor resistencia al deslizamiento debido a la topología controlada y la separación de microfasas.

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Área de la Ciencia:

  • Ciencias de los materiales
  • Química de los polímeros
  • Reología

Sus antecedentes:

  • Los vitrímeros son redes dinámicas de polímeros con enlaces cruzados asociativos que permiten el flujo y el reprocesamiento.
  • Los copolímeros de bloque ofrecen un control preciso sobre la arquitectura del polímero y el autoensamblaje en nanoestructuras.
  • La combinación de estos materiales podría conducir a polímeros avanzados con propiedades viscoelásticas ajustables.

Objetivo del estudio:

  • Para fusionar copolímeros de bloque con vitrímeros para el control a nanoescala sobre la dinámica y el flujo de enlaces cruzados asociativos.
  • Investigar las relaciones estructura-propiedad en estos nuevos vidriadores de bloque.
  • Para explorar el potencial de control de la topología sobre el comportamiento viscoelástico.

Principales métodos:

  • Utilizó técnicas de polimerización controlada para sintetizar copolímeros de bloque con arquitecturas y pesos moleculares definidos.
  • Vitrímeros formulados a partir de estos copolímeros de bloque de autoensamblaje.
  • Caracterizó las propiedades viscoelásticas y la resistencia a la deformación macroscópica.

Principales resultados:

  • Los vitrímeros derivados de copolímeros de bloque demostraron una resistencia superior a la deformación macroscópica en comparación con los análogos de copolímeros estadísticos.
  • La polimerización controlada permitió un ajuste preciso de la arquitectura del polímero y el peso molecular, impactando los efectos de la estructura y la propiedad.
  • Se observó una mayor resistencia al deslizamiento en los vitrímeros de bloque, atribuida a la topología de cadena controlada y la separación de microfasas.

Conclusiones:

  • Los vitrímeros de bloque representan una nueva clase de materiales con flujo viscoelástico controlado por topología.
  • La estructura separada por microfasas en los vitrímeros de bloque es clave para su mayor resistencia a la deformación.
  • Estos hallazgos abren vías para diseñar materiales avanzados con propiedades viscoelásticas adaptadas a aplicaciones específicas.