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Related Concept Videos

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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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,...
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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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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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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...
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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

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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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A Simple and Efficient Protocol for the Catalytic Insertion Polymerization of Functional Norbornenes
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User-Friendly, Living Coordination-Insertion Polymerizations with Broad Functional Group Tolerance.

Jesse H Hsu1, Cassandra A Haynes1, Alexandra J Macbeth1

  • 1Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States.

Journal of the American Chemical Society
|October 24, 2025
PubMed
Summary
This summary is machine-generated.

A new catalyst enables user-friendly, air-stable polymerization of functional materials at room temperature. This breakthrough facilitates the synthesis of advanced polymers with diverse functionalities.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Catalysis

Background:

  • Developing user-friendly polymerization methods is crucial for accelerating materials science discovery.
  • Existing methods often struggle with monomer sensitivity and functional group tolerance.

Purpose of the Study:

  • To introduce a novel, bench-stable catalyst for living coordination-insertion polymerization.
  • To enable the synthesis of advanced functional materials with broad functional group tolerance.

Main Methods:

  • Utilized a single-component catalyst, (Ad3P)Pd(Me)SbF6, for polymerization.
  • Conducted polymerization under ambient conditions (air, room temperature).
  • Investigated the role of tri(1-adamantyl)phosphine (Ad3P) ligand and silver salt activator.

Main Results:

  • Achieved living coordination-insertion polymerization of substituted norbornenes.
  • Demonstrated broad functional group tolerance (>30 groups).
  • Successfully synthesized block copolymers, ultrahigh molecular weight polymers, and functional polymers.

Conclusions:

  • The developed catalytic system offers a user-friendly approach to synthesizing advanced functional materials.
  • This method overcomes limitations of traditional polymerization techniques.
  • Enables direct synthesis of complex polymer architectures.