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Related Concept Videos

Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

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

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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 generated carbocation,...

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Supramolecular ABC triblock copolymers.

Ashootosh V Ambade1, Si Kyung Yang, Marcus Weck

  • 1Department of Chemistry and Molecular Design Institute, New York University, 100 Washington Square East, New York, NY 10003, USA.

Angewandte Chemie (International Ed. in English)
|March 17, 2009
PubMed
Summary
This summary is machine-generated.

Ruthenium initiators create polymers with dual functional groups in one step. These polymers then self-assemble into complex supramolecular ABC triblock copolymers by adding complementary polymers.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Ring-opening metathesis polymerization (ROMP) is a versatile method for polymer synthesis.
  • Creating polymers with specific end-group functionalities (heterotelechelic polymers) is crucial for advanced material design.
  • Self-assembly of block copolymers into complex architectures like ABC triblocks is a key goal in supramolecular chemistry.

Purpose of the Study:

  • To develop a facile method for synthesizing heterotelechelic polymers with both hydrogen-bonding and metal-coordination sites.
  • To demonstrate the one-pot self-assembly of these polymers into supramolecular ABC triblock copolymers.

Main Methods:

  • Utilized ruthenium initiators functionalized with hydrogen-bonding sites for ring-opening metathesis polymerization.
  • Synthesized heterotelechelic polymers in a single step.
  • Achieved one-pot self-assembly by mixing heterotelechelic polymers with complementary telechelic polymers.

Main Results:

  • Successfully prepared heterotelechelic polymers bearing hydrogen-bonding and metal-coordination units.
  • Demonstrated the efficient one-pot self-assembly of these polymers into supramolecular ABC triblock copolymers.
  • The process is simplified by 'just adding it' complementary polymers.

Conclusions:

  • Ruthenium-initiated ROMP offers a straightforward route to functional polymers.
  • The developed method enables the facile construction of complex supramolecular architectures.
  • This approach provides a versatile platform for designing advanced polymeric materials.