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Related Concept Videos

Ion Exchange01:17

Ion Exchange

593
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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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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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.3K
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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Intermolecular Forces03:13

Intermolecular Forces

58.4K
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
58.4K
Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

2.0K
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...
2.0K
Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

3.3K
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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Preparation of Monodomain Liquid Crystal Elastomers and Liquid Crystal Elastomer Nanocomposites
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Poly(Ionic Liquid) Double-Network Elastomers with High-Impact Resistance Enhanced by Cation-π Interactions.

Qingning Li1, Weizheng Li1, Ziyang Liu1

  • 1Jiangsu Engineering Laboratory of Novel Functional Polymeric Materials, Jiangsu Key Laboratory of Advanced Negative Carbon Technologies, Suzhou Key Laboratory of Soft Material and New Energy, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China.

Advanced Materials (Deerfield Beach, Fla.)
|December 27, 2023
PubMed
Summary

New poly(ionic liquid) (PIL)/poly(hydroxyethyl acrylate) (PHEA) double-network (DN) elastomers offer superior impact resistance and toughness. These advanced materials provide enhanced protection for fragile items, paving the way for next-generation safety materials.

Keywords:
DN elastomerscation‐π interactionshigh toughnessimpact protection materialsimpact resistance

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • The demand for advanced impact protection materials necessitates lightweight, high-impact resistance, flexibility, and controllable toughness.
  • Existing materials often struggle to balance these competing properties effectively.
  • Poly(ionic liquid)s (PILs) and poly(hydroxyethyl acrylate) (PHEA) are promising polymer components for material design.

Purpose of the Study:

  • To construct novel poly(ionic liquid) (PIL)/poly(hydroxyethyl acrylate) (PHEA) double-network (DN) elastomers.
  • To enhance impact resistance, toughness, and mechanical strength through specific cross-linking and interactions.
  • To explore the potential of these elastomers as next-generation safety and protective materials.

Main Methods:

  • Synthesized PIL/PHEA double-network (DN) elastomers using multiple cross-linking strategies.
  • Utilized cation-π interactions of PIL chains to enhance noncovalent cohesion.
  • Investigated material properties under high-velocity impact loads (5000 s-1).

Main Results:

  • The prepared PIL DN elastomers demonstrated exceptional compressive strength (95.24 ± 2.49 MPa).
  • Extraordinary toughness (55.98 ± 0.66 MJ m-3) was achieved under high-velocity impact.
  • The material successfully combined strength and flexibility for impact protection.

Conclusions:

  • The developed PIL DN elastomers exhibit outstanding mechanical properties, including high strength and toughness.
  • Cation-π interactions are crucial for achieving strong noncovalent cohesion and superior performance.
  • This strategy offers a new avenue for designing advanced safety and protective materials.