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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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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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 properties that they exhibit. Additionally,...
Polymers02:34

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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 properties that they exhibit. Additionally,...
Polymers02:34

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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 catalyst, high molecular...
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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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Layer-by-layer Synthesis and Transfer of Freestanding Conjugated Microporous Polymer Nanomembranes
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Constructing monocrystalline covalent organic networks by polymerization.

Daniel Beaudoin1, Thierry Maris, James D Wuest

  • 1Département de Chimie, Université de Montréal, Montréal, Québec H3C 3J7 Canada.

Nature Chemistry
|September 24, 2013
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Summary

Researchers developed modular construction for ordered materials, creating diamondoid azodioxy networks via reversible polymerization. This advances polymer science and supramolecular chemistry for ordered covalent and non-covalent structures.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Supramolecular Chemistry

Background:

  • Modular construction is an emerging strategy for creating ordered materials by connecting molecular subunits.
  • Existing methods have produced metal-organic frameworks, supramolecular networks, and covalent organic frameworks.
  • However, this strategy has not yet yielded covalently bonded organic materials in large single crystals.

Purpose of the Study:

  • To demonstrate that modular construction can produce covalently bonded organic materials in the form of large single crystals.
  • To explore reversible self-addition polymerizations for creating ordered covalent networks.
  • To establish a unified modular strategy for both covalent and non-covalent ordered structures.

Main Methods:

  • Design and synthesis of monomers with four tetrahedrally oriented nitroso groups.
  • Investigation of reversible self-addition polymerization reactions.
  • Characterization of the resulting polymer networks using single-crystal X-ray diffraction.

Main Results:

  • Monomers with four nitroso groups successfully polymerized to form diamondoid azodioxy networks.
  • The resulting networks were fully characterized by single-crystal X-ray diffraction, confirming their ordered covalent structure.
  • This demonstrates the feasibility of using reversible polymerization within a modular strategy.

Conclusions:

  • Reversible self-addition polymerization of designed monomers enables the formation of covalently bonded organic materials as large single crystals.
  • This work bridges polymer science and supramolecular chemistry, showcasing a single modular strategy for diverse ordered structures.
  • The findings open new avenues for designing and synthesizing complex, ordered organic materials.