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Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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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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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...
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Molecular Weight of Step-Growth Polymers01:08

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Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
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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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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: 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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Progress in Synthetic 2D Polymers Obtained at the Air/Water Interface.

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Researchers developed a new method to analyze 2D polymer monolayers, enabling laser-triggered writing and novel lithography techniques. This breakthrough advances the synthesis and application of these advanced sheet-like polymers.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Synthetic 2D polymers are gaining attention due to their unique sheet-like structure.
  • Current synthesis methods often require exfoliation, limiting scalability.
  • The air/water interface offers a promising route for synthesizing macroscopic 2D polymer monolayers.

Purpose of the Study:

  • To introduce recent monomers for single-crystal 2D polymer synthesis.
  • To present a novel analytical method for determining the crystallinity of 2D polymer monolayers.
  • To explore potential applications of 2D polymer monolayers in laser-triggered writing and lithography.

Main Methods:

  • Synthesis of 2D polymer monolayers at the air/water interface.
  • Tip-enhanced Raman spectroscopy (TERS) combined with a crystallization model for structural analysis.
  • Fabrication of ordered monomer arrays for laser-induced polymerization.

Main Results:

  • Demonstration of recent monomers enabling the synthesis of ordered 2D polymer monolayers.
  • Validation of an indirect analytical method to confirm the crystallinity of 2D polymer monolayers.
  • Successful application of 2D polymer monolayers in laser-triggered writing and a new lithography technique.

Conclusions:

  • The single-crystal approach at the air/water interface is a powerful method for synthesizing macroscopic 2D polymer monolayers.
  • The developed analytical technique provides crucial insights into the structure of 2D polymers.
  • These 2D polymers show significant potential for advanced fabrication and patterning applications.