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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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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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Anionic Chain-Growth Polymerization: Mechanism01:04

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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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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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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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[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

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The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Side-functionalized two-dimensional polymers synthesized via on-surface Schiff-base coupling.

Lirong Xu1, Lili Cao, Zongxia Guo

  • 1State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin, 150001, People's Republic of China. leisb@hit.edu.cn.

Chemical Communications (Cambridge, England)
|April 24, 2015
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Summary
This summary is machine-generated.

A novel 2D polymer with o-hydroxyl groups was synthesized for chelating applications. Higher temperatures induced oxazoline formation, distorting the polymer network.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Surface Science

Background:

  • Two-dimensional (2D) polymers offer unique properties for advanced applications.
  • Functionalization of 2D polymers is crucial for tailoring their chemical behavior.
  • Chelating agents are vital for metal ion sequestration and catalysis.

Purpose of the Study:

  • To design and synthesize an imine-based 2D polymer functionalized with o-hydroxyl groups.
  • To investigate the polymer's potential as a chelating agent.
  • To study the thermal stability and structural changes of the 2D polymer.

Main Methods:

  • Synthesis of an imine-based 2D polymer on a highly oriented pyrolytic graphite (HOPG) surface.
  • Annealing the polymer at low and high temperatures.
  • Characterization using Attenuated Total Reflectance Fourier-Transform Infrared Spectroscopy (ATR-FTIR).

Main Results:

  • Successful synthesis of a 2D polymer with o-hydroxyl side groups on HOPG at low annealing temperatures.
  • Formation of oxazoline rings upon annealing at higher temperatures due to intramolecular reaction.
  • Significant network distortion observed after oxazoline formation, confirmed by ATR-FTIR.

Conclusions:

  • The synthesized 2D polymer exhibits potential as a chelating agent.
  • Thermal treatment leads to irreversible structural modification via oxazoline formation.
  • The study highlights the importance of annealing temperature in controlling 2D polymer network integrity and functionality.