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Related Concept Videos

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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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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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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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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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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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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Sequence and gelation in supramolecular polymers.

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This summary is machine-generated.

We extended coherent states (CS) field theories to model supramolecular polymers with backbone reversible bonds. This reveals how reactive site placement influences phase behavior, predicting a novel microstructured gel phase.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Theoretical Chemistry

Background:

  • Supramolecular polymer networks offer tunable properties for applications like adhesives and rheology modifiers.
  • Coherent states (CS) field theories effectively describe associating polymers but were limited to simpler architectures.

Purpose of the Study:

  • To extend the CS framework for polymers with reversible bonds along the backbone.
  • To investigate the impact of reactive site placement on supramolecular polymer phase behavior.

Main Methods:

  • Developed an extended CS field theory framework.
  • Applied the theory to analyze polymers with backbone-distributed reversible bonds.
  • Investigated sol-gel phase transitions and microphase formation.

Main Results:

  • Successfully extended CS theory to complex polymer architectures.
  • Identified the critical role of reactive site placement in determining phase behavior.
  • Predicted a novel microstructured gel phase in neutral polymer gels.

Conclusions:

  • The extended CS framework enables theoretical study of new supramolecular materials.
  • Reactive site distribution significantly influences thermodynamic properties and phase behavior.
  • Advanced theoretical approaches are crucial for understanding complex supramolecular polymer systems.