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Related Concept Videos

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 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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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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Ionic Bonds

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Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
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Members Made of Elastoplastic Material01:19

Members Made of Elastoplastic Material

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The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
As the bending moment...
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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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Robust Ionic Gel Elastomers Derived from Molecularly Entangled Nodes.

Honggang Mei1,2, Chen Liu3, Nan Jiang1,2

  • 1Department of Chemistry, Stoddart Institute of Molecular Science, Zhejiang University, Hangzhou, 310058, P.R. China.

Angewandte Chemie (International Ed. in English)
|June 4, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed advanced ionic gel-based elastomers for intelligent devices. These materials offer superior mechanical strength and flexibility, enhancing robot and device performance and reliability.

Keywords:
ElastomerEntangled nodeIonic gelMechanical propertySupramolecular polymer

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Robotics

Background:

  • Flexible polymeric elastomeric materials are crucial for intelligent devices like bionic robots.
  • Conventional elastomers face limitations in balancing intelligence with mechanical robustness.

Purpose of the Study:

  • To engineer ionic gel-based elastomers that combine high intelligence with superior mechanical properties.
  • To address the compromise between performance and durability in existing elastomeric materials.

Main Methods:

  • Construction of ionic gel-based elastomers utilizing molecularly entangled nodes.
  • Exploiting dynamic interplay of entangled nodes for stress-induced dissociation and polymer chain slippage.
  • Characterization of mechanical properties, including tensile strength, strain capacity, and cyclic stability.

Main Results:

  • Achieved a tensile strength of 33.5 ± 0.5 MPa and a strain capacity of 4000 ± 280%.
  • Demonstrated stable performance over 7000 cycles, indicating high durability.
  • Incorporated the ability to detect minor material defects, enhancing diagnostic capabilities.

Conclusions:

  • The developed ionic gel-based elastomers offer a breakthrough in material design for intelligent devices.
  • These materials significantly advance the versatility, reliability, and performance of bionic robots and other intelligent systems.
  • The unique properties pave the way for next-generation smart materials with integrated sensing capabilities.