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Radical Chain-Growth Polymerization: Mechanism01:09

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The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
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Characteristics and Nomenclature of Copolymers01:24

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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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Radical Chain-Growth Polymerization: Overview01:10

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Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
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Free-Radical Chain Reaction and Polymerization of Alkenes02:35

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The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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Radical Chain-Growth Polymerization: Chain Branching01:17

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The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
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Step-Growth Polymerization: Overview01:03

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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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Síntesis en fase sólida de copolímeros de varios bloques bien definidos mediante polimerización radical por

Grzegorz Szczepaniak1,2, Kriti Kapil1, Samuel Adida1

  • 1Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States.

Journal of the American Chemical Society
|July 30, 2024
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Resumen

Este estudio introduce un nuevo método de síntesis de polímeros en fase sólida utilizando resina anfifílica ChemMatrix y polimerización de radicales de transferencia atómica (ATRP) para crear copolímeros de bloque controlados por secuencia.

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Área de la Ciencia:

  • Química de los polímeros
  • Ciencias de los materiales
  • Síntesis orgánica

Sus antecedentes:

  • La síntesis de fase sólida, originada en la química de péptidos, es una técnica poderosa para las macromoléculas.
  • Los soportes sólidos tradicionales a menudo tienen limitaciones en la compatibilidad y el procesamiento de disolventes.

Objetivo del estudio:

  • Desarrollar un método eficiente en fase sólida para la síntesis de polímeros controlada por secuencia.
  • Utilizar las propiedades únicas de la resina ChemMatrix (CM) para mejorar la síntesis de polímeros.

Principales métodos:

  • Inmovilización covalente de cadenas de polímeros en una resina de ChemMatrix (CM) a base de polietileno glicol (PEG).
  • Combinación de polimerización radical por transferencia de átomos (ATRP) con técnicas de fase sólida.
  • Síntesis de copolímeros de varios bloques (di-, tri-, tetra-, y penta-bloques)

Principales resultados:

  • Se obtienen altos rendimientos de copolímeros de bloque bien definidos con un excelente control del peso molecular y la dispersión.
  • Demostró la versatilidad del método con varios monómeros en medios orgánicos y acuosos.
  • Limitaciones identificadas en el logro de pesos moleculares muy altos debido al confinamiento de los poros de la resina.

Conclusiones:

  • El enfoque de síntesis de polímeros en fase sólida desarrollado utilizando resina CM es eficaz para crear copolímeros de bloque controlados por secuencia.
  • Este método ofrece una vía simplificada y rápida para la síntesis de copolímeros de bloque a medida con diversas funcionalidades.
  • La naturaleza anfifílica de la resina CM mejora la eficiencia del procesamiento en comparación con los soportes tradicionales.