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Related Concept Videos

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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Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and 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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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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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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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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Stability of Conjugated Dienes01:28

Stability of Conjugated Dienes

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Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
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Synthesis of Soft Polysiloxane-urea Elastomers for Intraocular Lens Application
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Dynamic Covalent Polyurethane Network Materials: Synthesis and Self-Healability.

Pothanagandhi Nellepalli1, Twinkal Patel1, Jung Kwon Oh1

  • 1Department of Chemistry and Biochemistry, Concordia University, Montreal, Quebec, H4B 1R6, Canada.

Macromolecular Rapid Communications
|August 21, 2021
PubMed
Summary

This review explores self-healable polyurethane materials using dynamic covalent bonds for enhanced durability and recyclability. These advanced polymers offer promising solutions for sustainable material applications.

Keywords:
covalent adaptive networksdynamic/reversible bondspolyurethanesreprocessabilityself-healability

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The Preparation and Properties of Thermo-reversibly Cross-linked Rubber Via Diels-Alder Chemistry
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Area of Science:

  • Polymer Science
  • Materials Science

Background:

  • Polyurethane (PU) is a versatile polymer with widespread applications.
  • There is a growing demand for high-performance, durable, and recyclable PU materials.
  • Self-healing capabilities are crucial for extending material lifetime and reliability.

Purpose of the Study:

  • To review strategies for synthesizing self-healable, reprocessable, and recyclable PU materials.
  • To highlight the role of dynamic covalent bonds in achieving these properties.
  • To explore the integration of dynamic chemistries with nanofillers for advanced composites.

Main Methods:

  • Incorporation of dynamic covalent bonds (e.g., Diels-Alder, disulfide, imine) into PU structures.
  • Design of covalently crosslinked polymers and thermoplastic elastomers.
  • Fabrication of dynamic heterogeneous PU composites using nanofillers.

Main Results:

  • Dynamic covalent bonds enable PU materials to dissociate and reform, facilitating self-healing and reprocessing.
  • Various dynamic chemistries can be integrated to tune material properties.
  • Combining dynamic covalent chemistries with nanofiller surface modification enhances composite performance.

Conclusions:

  • Self-healable, reprocessable, and recyclable PU materials can be synthesized using dynamic covalent bonds.
  • These advanced materials offer significant advantages in performance, longevity, and sustainability.
  • Future research can focus on novel dynamic chemistries and composite designs for tailored applications.