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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 species into...
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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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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 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 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.
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Curvature effects in the reaction-diffusion system governing frontal polymerization.

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Area of Science:

  • Polymer Chemistry and Materials Science
  • Chemical Engineering
  • Reaction Kinetics

Background:

  • Frontal polymerization is an efficient method for polymer curing.
  • The polymerization front's temperature, speed, and geometry are interconnected and impact polymer properties.
  • Understanding front dynamics is crucial for controlling curing processes.

Purpose of the Study:

  • To investigate the impact of polymerization front curvature on propagation speed.
  • To develop analytical models relating front geometry to propagation dynamics.
  • To provide insights into the relationship between front curvature and exothermic reaction kinetics.

Main Methods:

  • Utilized a reaction-diffusion model to study front propagation.
  • Employed finite element simulations for verification.
  • Validated model predictions through experimental studies.

Main Results:

  • Concave fronts exhibit higher temperatures and speeds compared to convex fronts.
  • A critical curvature for convex fronts leads to reaction quenching.
  • Derived analytical relationships between front speed, geometry, and thickness.
  • Demonstrated good agreement between model predictions and experimental observations.

Conclusions:

  • Frontal polymerization speed is significantly affected by front curvature.
  • The geometry of the polymerization front plays a critical role in reaction sustainability and propagation speed.
  • This research provides a framework for predicting and controlling frontal polymerization dynamics based on front geometry.