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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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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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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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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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Polymers02:34

Polymers

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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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Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

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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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Chain-Length-Dependent Hydrogen-Bonded Self-Assembly of Terminally Functionalized Discrete Polyketones.

Kilingaru I Shivakumar1, Yumehiro Manabe2, Tomoki Yoneda2

  • 1Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University, Kita 21, Nishi 10, Kita-ku, Sapporo, Hokkaido 001-0021, Japan.

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|August 29, 2025
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Summary

This study explores how polyketone chain length affects self-assembly. Shorter chains form helical structures, while longer ones create different networks, with one showing gelation, demonstrating chain length

Keywords:
gelhelixhydrogen bondpolyketoneself-assembly

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Organic Synthesis

Background:

  • Hydrogen-bonding interactions are crucial for molecular self-assembly.
  • Polyketones offer a versatile scaffold for designing self-assembling materials.
  • Controlling chain length is a key strategy for tuning self-assembly.

Purpose of the Study:

  • To synthesize discrete polyketones with varying chain lengths.
  • To investigate the chain-length-dependent self-assembly of these polyketones.
  • To explore the influence of terminal functional groups (carboxyl and pyridine) on self-assembly.

Main Methods:

  • Synthesis of polyketones via coupling reactions and subsequent hydrolysis/amidation.
  • Single-crystal X-ray diffraction for structural analysis.
  • Scanning electron microscopy (SEM) for characterizing xerogel structures.
  • Gelation studies in solution.

Main Results:

  • Carboxyl-terminated polyketones (C1, C2) formed helical assemblies via carboxyl dimerization.
  • Longer C3 formed infinite chains mediated by 1,4-dioxane.
  • Pyridine-terminated P1 formed a 3D hydrogen-bonded network.
  • P2 exhibited a double-helix-like structure and showed gelation in chloroform.
  • SEM revealed rod-like structures for P2 xerogel.

Conclusions:

  • Polyketone chain length significantly impacts self-assembly in both solid and solution states.
  • Terminal functional groups (carboxyl vs. pyridine) direct distinct self-assembly pathways.
  • Precise control over polyketone architecture enables tailored supramolecular structures and functions, like gelation.