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Related Concept Videos

Ion Exchange01:17

Ion Exchange

669
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

2.2K
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,...
2.2K
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.4K
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...
2.4K
Ions as Acids and Bases02:54

Ions as Acids and Bases

24.2K
Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
24.2K
Polyprotic Acids03:38

Polyprotic Acids

29.6K
Acids are classified by the number of protons per molecule that they can give up in a reaction. Acids such as HCl, HNO3, and HCN that contain one ionizable hydrogen atom in each molecule are called monoprotic acids. Their reactions with water are:
29.6K
EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

2.2K
Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
2.2K

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Preparation of Hydroxy-PAAm Hydrogels for Decoupling the Effects of Mechanotransduction Cues
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Acid-Adaptive Polymers Capable of Proton-Capturing and Matrix-Strengthening.

Haixu Du1, Haoxiang Deng1, Di Liu1

  • 1Sonny Astani Department of Civil and Environmental Engineering, University of Southern California, Los Angeles, California, USA.

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This summary is machine-generated.

This study introduces an acid-adaptive polymer inspired by bacteria. The material neutralizes protons and self-repairs, enhancing stiffness and strength for use in harsh environments.

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Area of Science:

  • Materials Science
  • Biomimetic Engineering

Background:

  • Biological systems adapt to environmental stressors like acidity, a trait not seen in conventional polymers.
  • Polymers typically degrade in acidic conditions due to chemical bond cleavage, losing mechanical integrity.
  • Acid-resistant bacteria like Escherichia coli and Lactococcus lactis neutralize protons to survive acidic environments.

Purpose of the Study:

  • Develop an acid-adaptive polymer mimicking natural acid resistance.
  • Create a material with exceptional acid resistance and acid-triggered mechanical restoration.

Main Methods:

  • Incorporate sodium carboxylate and amino functional groups to neutralize protons.
  • Utilize acid-induced amidation reactions at 40°C to form secondary crosslinks.
  • Design a polymer matrix that mitigates acid degradation and enhances mechanical properties.

Main Results:

  • Achieved a 119% increase in stiffness.
  • Observed a 101% increase in strength.
  • Demonstrated dual functionality: proton neutralization and mechanical restoration.

Conclusions:

  • The developed polymer offers a novel solution for applications in acidic environments.
  • Potential applications include defense, chemical processing, and automotive industries.
  • The material's ability to adapt and self-repair in acidic conditions offers enhanced durability.