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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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Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the...
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The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
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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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A Group-Enriched Viscoelastic Model for High-Damping Vitrimers with Many Dangling Chains.

Yan Li1, Haibo Feng1, Jing Xiong1

  • 1State Key Laboratory of Intelligent Manufacturing Equipment and Technology, School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.

Materials (Basel, Switzerland)
|October 26, 2024
PubMed
Summary

A new group-enriched viscoelastic model accurately predicts self-healing vitrimer behavior, improving upon classical models by accounting for group movements in damping materials.

Keywords:
damping materialgroup effectloss modulusviscoelastic modelvitrimer

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Rheology

Background:

  • Classical viscoelastic models often fail to capture complex behaviors in self-healing vitrimers due to their limited scope, primarily considering chain segment and whole chain motion.
  • Vitrimer materials, particularly those designed for damping applications, exhibit significant group movements that are crucial for their performance but are neglected in traditional models.

Purpose of the Study:

  • To develop and validate a "group-enriched" viscoelastic model capable of accurately describing the behavior of self-healing vitrimers where group effects are prominent.
  • To synthesize a novel damping vitrimer with numerous dangling chains to enhance damping properties and highlight the importance of group effects.

Main Methods:

  • Synthesis of a damping vitrimer featuring abundant dangling chains to increase damping capacity.
  • Development of a group-enriched viscoelastic model incorporating the influence of group movements.
  • Experimental characterization of the synthesized vitrimer's damping behavior and comparison with model predictions.

Main Results:

  • The synthesized vitrimer demonstrated enhanced damping capabilities due to its dangling chains.
  • The group-enriched viscoelastic model accurately captured the experimental damping behavior of the synthesized vitrimer.
  • The model's accuracy significantly improved compared to classical viscoelastic models for this specific material.

Conclusions:

  • The group-enriched viscoelastic model provides a more accurate representation of self-healing vitrimer dynamics, especially when group movements are significant.
  • The influence of group effects on viscoelastic behavior is frequency and temperature-dependent, being negligible at low frequencies but significant at high frequencies or low temperatures.