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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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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.
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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
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Olefin Metathesis Polymerization: Overview01:13

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
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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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Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by &#960;-&#960; Stacking Interactions
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Ingeniería de polimerizaciones topoquímicas utilizando plantillas de copolímero de bloque.

Liangliang Zhu1, Helen Tran, Frederick L Beyer

  • 1Department of Chemistry, Columbia University , New York, New York 10027, United States.

Journal of the American Chemical Society
|September 12, 2014
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron un método novedoso para la polimerización rápida en estado sólido utilizando un monómero de difenildiacetileno y una plantilla de copolimero de bloque. Esta técnica permite la creación eficiente de materiales fotopolimerizables para aplicaciones avanzadas.

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Área de la Ciencia:

  • Ciencia de los materiales Ciencia de los materiales.
  • Química de Polímeros La química de los polímeros es la química de los polímeros.
  • Nanotecnología La nanotecnología es la nanotecnología.

Sus antecedentes:

  • La polimerización en estado sólido ofrece ventajas para crear estructuras poliméricas ordenadas.
  • El control de la polimerización en películas delgadas a través del procesamiento de soluciones sigue siendo un desafío.
  • El ensamblaje supramolecular puede dirigir las reacciones químicas en los materiales.

Objetivo del estudio:

  • Desarrollar un método rápido y eficiente para la polimerización topoquímica en estado sólido.
  • Para crear materiales fotopolimerizables con plantilla supramolecular utilizando copolímeros de bloque.
  • Para permitir el procesamiento basado en soluciones de películas delgadas de polímeros conjugados.

Principales métodos:

  • Integración de un monómero de difenildiacetileno con una plantilla de copolímero de bloque de poli (ácido estireno-b-acrílico).
  • Utilizando interacciones no covalentes para el moldeado de la fotopolimerización topoquímica.
  • Procesamiento de la película delgada y exposición a la luz UV para la polimerización y micropatronización.

Principales resultados:

  • El autoensamblaje jerárquico de los monómeros de diacetileno a través de la segregación de microfasas de la segregación de bloques de copolímero mejora la polimerización.
  • Completa fotopolimerización topoquímica lograda dentro de los 20 segundos de la exposición a los rayos UV.
  • Fotopolimerización y micropatronización simultáneas de derivados de polidifenildiacetileno (PDPDA) utilizando grupos de enlace cruzado UV-activos.

Conclusiones:

  • La estrategia desarrollada permite una polimerización en estado sólido rápida, procesable en solución y con plantilla supramolecular.
  • El método permite la generación eficiente de derivados de polidifenildiacetileno con estructuras jerárquicas.
  • Aplicaciones potenciales en la microfabricación de sensores y materiales conjugados flexibles.