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Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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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: Ring-Opening Metathesis Polymerization (ROMP)01:16

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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

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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.
Many natural and synthetic polymers are produced by...
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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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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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Cyclic polymers: synthesis, characteristics, and emerging applications.

Chaojian Chen1,2, Tanja Weil1

  • 1Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany. chenc@northwestern.edu.

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Summary
This summary is machine-generated.

Cyclic polymers, ring-like macromolecules without chain ends, offer unique properties and applications. This review covers their synthesis, properties, and future potential in areas like drug delivery.

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Area of Science:

  • Macromolecular chemistry
  • Polymer science
  • Materials science

Background:

  • Cyclic polymers are macromolecules characterized by a ring-like topology and the absence of chain ends.
  • Significant progress has been made in synthesizing these unique polymers over recent decades.
  • Their topological nature allows for distinct physical properties and behaviors compared to linear analogues.

Purpose of the Study:

  • To review synthetic strategies for cyclic and topological polymers.
  • To discuss the unique physical properties and self-assembly of cyclic polymers.
  • To highlight current and potential applications of cyclic polymers.

Main Methods:

  • Review of synthetic methodologies for cyclic polymer preparation.
  • Comparative analysis of cyclic versus linear polymer properties.
  • Exploration of self-assembly phenomena in cyclic polymers.
  • Summary of diverse application areas.

Main Results:

  • Established synthetic routes for cyclic polymers and complex topological structures.
  • Demonstrated unique physical properties and self-assembly behaviors of cyclic polymers.
  • Highlighted hierarchical macromolecular architectures formed by cyclic polymers.
  • Presented applications in drug/gene delivery and surface functionalization.

Conclusions:

  • Cyclic polymers exhibit distinct properties due to their topology.
  • They self-assemble into complex architectures with diverse applications.
  • Future research should focus on scalable synthesis, purification, and programmable assembly.