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Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

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 acceptor.
Mechanism of Lamellipodia Formation01:31

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Cells migrating in response to external stimuli form lamellipodia, which are thin membrane protrusions supported by a mesh of linked, branched, or unbranched actin filaments. These actin filaments interact with myosin motor proteins, creating the dynamic actomyosin complex within the cytoskeleton. Contractility, or the ability to generate contractile stress, is inherent to the actomyosin complex. It helps cells detect the stiffness of the surrounding ECM and exert contractile force for...
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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,...
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
09:22

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Published on: February 7, 2017

La función nanomecánica de los polifenilacetilenos helicoidales dendronizados autoorganizables tiene una función

Virgil Percec1, Jonathan G Rudick, Mihai Peterca

  • 1Roy & Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, USA.

Journal of the American Chemical Society
|May 21, 2008
PubMed
Resumen

Los polímeros helicoidales autoorganizables actúan como nanomáquinas moleculares. Estos materiales avanzados pueden realizar trabajos mecánicos, lo que demuestra el potencial para la activación a nanoescala y aplicaciones macroscópicas.

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Área de la Ciencia:

  • La ciencia de los polímeros es la ciencia de los polímeros.
  • Ciencia de los materiales Ciencia de los materiales.
  • Nanotecnología La nanotecnología es la nanotecnología.

Sus antecedentes:

  • Los polímeros helicoidales dendronizados ofrecen arquitecturas únicas para máquinas moleculares.
  • La autoorganización es clave para traducir el movimiento molecular en efectos macroscópicos.

Objetivo del estudio:

  • Para demostrar la función nanomecánica en los polifenilacetilenos cis-transoidales dendronizados helicoidales auto-organizados (cis-PPA).
  • Identificar las propiedades estructurales supramoleculares esenciales para la accionamiento nanomecánico.

Principales métodos:

  • Síntesis y caracterización de las bibliotecas cis-PPA.
  • Investigación de las transiciones de fase (recinto columnar hexagonal a la fase de cristal líquido).
  • Evaluación de las capacidades de extrusión de fibra y desplazamiento de trabajo.

Principales resultados:

  • cis-PPAs exhiben una transición de fase de primer orden que permite la función nanomecánica.
  • Las fibras extrudidas de cis-PPA pueden desplazar objetos de hasta 250 veces su masa.
  • Se observó la extensión / contracción reversible de la columna vertebral a través de la isomerización cisoide-transoide.

Conclusiones:

  • Los polímeros helicoidales dendronizados auto-organizables son eficaces nanomáquinas moleculares.
  • La función nanomecánica está vinculada a estructuras supramoleculares específicas y transiciones de fase.
  • Estos polímeros son prometedores como actuadores para aplicaciones macroscópicas.