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Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

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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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Anionic Chain-Growth Polymerization: Overview01:20

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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
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Amides are synthesized by treating carboxylic acids with amines in the presence of dehydrating agents like dicyclohexylcarbodiimide (DCC).
The DCC-promoted synthesis of amides begins with the protonation of DCC by carboxylic acid. The protonation makes it a better acceptor. Next, the addition of carboxylate to the protonated carbodiimide gives a reactive acylating agent.
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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Conjuntos mixtos de amida paraciclófano que emulan los copolímeros supramoleculares

Cole D Stearns1, Ajeet Kumar1, Ion Ghiviriga1

  • 1Department of Chemistry, University of Florida, P.O. Box 117200 Gainesville, Florida 32611, United States.

Journal of the American Chemical Society
|July 7, 2025
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Resumen

Las nuevas [2.2]paraciclofanotetracarboxamidas ([2.2]pCpMTAs) imitan los copolímeros supramoleculares. El enlace de hidrógeno programable controla el autoensamblaje y los resultados estructurales en polímeros a base de amida.

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Área de la Ciencia:

  • Química supramolecular
  • Ciencia de los materiales orgánicos
  • Química de los polímeros

Sus antecedentes:

  • [2.2]Los paraciclopanos ([2.2]pCps) son valiosos para el estudio de la transferencia de carga y en la química fotorreductiva.
  • El primer [2.2]paraciclfano-tetracarboxamida ([2.2]pCpTA) fue sintetizado en 2016.
  • Los polímeros supramoleculares ofrecen propiedades sintonizables a través del autoensamblaje controlado.

Objetivo del estudio:

  • Explorar las amidas mixtas [n.n]paraciclofano-tetracarboxamidas ([n.n]pCpMTA) para emular los copolímeros supramoleculares.
  • Investigar cómo los efectos estereoelectrónicos influyen en el autoensamblaje y la formación de polímeros.
  • Demostrar el control estructural en polímeros supramoleculares basados en amida a través de enlaces H diseñados.

Principales métodos:

  • Síntesis y caracterización de monómeros pseudo-orto y pseudo-meta de cubierta mixta [2.2]pCpMTA.
  • Espectroscopia de concentración variable y de temperatura variable.
  • Cálculos de cristalografía de rayos X y teoría funcional de la densidad (DFT).

Principales resultados:

  • Los monómeros de [2.2]pCpMTA diseñados exhiben enlaces de hidrógeno transanulares programables.
  • El enlace H dicta la conformación de moléculas pequeñas y la secuenciación de amidas en ensamblajes.
  • Los datos espectroscópicos, cristalográficos y DFT se correlacionan con el enlace H, el ensamblaje y los efectos dipolares con el control estructural.

Conclusiones:

  • Los [n.n]pCpMTA mezclados emulan eficazmente los copolímeros supramoleculares alternados.
  • La ingeniería estereoelectrónica a través del enlace H proporciona un control preciso sobre la polimerización supramolecular.
  • Estos hallazgos ofrecen ideas aplicables al diseño de diversas arquitecturas supramoleculares más allá de los ciclófanos.