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Related Concept Videos

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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Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

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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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Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

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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...
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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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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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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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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.
Many natural and synthetic polymers are produced by...
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Using Polystyrene-block-polyacrylic acid-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization
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Liquid-phase synthesis of block copolymers containing sequence-ordered segments.

Sebastian Pfeifer1, Zoya Zarafshani, Nezha Badi

  • 1Nanotechnology for Life Science Research Group, Fraunhofer Institute for Applied Polymer Research, Geiselbergstrasse 69, Potsdam-Golm 14476, Germany.

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Summary

Sequence-defined oligomers were synthesized without protecting groups using click chemistry and amidation. Soluble polymer supports enabled versatile synthesis of oligomers and block copolymers.

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Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions
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Area of Science:

  • Polymer Chemistry
  • Organic Synthesis
  • Supramolecular Chemistry

Background:

  • Developing methods for synthesizing sequence-defined oligomers is crucial for creating advanced functional materials.
  • Traditional solid-phase synthesis often requires protecting groups, adding complexity and steps.
  • Controlling the precise sequence of monomers in oligomers is essential for predictable properties.

Purpose of the Study:

  • To develop a protecting-group-free method for synthesizing monodisperse, sequence-defined oligomers.
  • To explore the use of soluble polymer supports for oligomer synthesis and block copolymer preparation.
  • To demonstrate the versatility of chemoselective reactions in constructing complex oligomeric structures.

Main Methods:

  • Stepwise synthesis utilizing 1,3-dipolar cycloaddition (click chemistry) and amidification reactions.
  • Construction of oligomers on both conventional solid supports (Wang resin) and tailor-made soluble polystyrene supports.
  • Synthesis of soluble polystyrene supports via atom-transfer radical polymerization (ATRP).

Main Results:

  • Successful synthesis of monodisperse sequence-defined oligomers in solution without protecting groups.
  • Demonstration of efficient oligomer construction on both solid and soluble polymer supports.
  • Versatile application of soluble macromolecular supports for both cleavable oligomer synthesis and non-cleavable block copolymer preparation.

Conclusions:

  • Protecting-group-free synthesis of sequence-defined oligomers is achievable using sequential chemoselective reactions.
  • Soluble polymer supports offer a versatile platform for synthesizing defined oligomers and block copolymers.
  • This approach expands the toolkit for creating precisely structured macromolecules with potential applications in materials science.