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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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Adhesion01:14

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Adhesion occurs when one type of molecule is attracted to a different molecule. Water exhibits adhesive properties in the presence of polar surfaces, such as glass or cellulose in plants. For instance, when water is poured into a glass, the positively charged hydrogen molecules of water are more attracted to the negatively charged oxygen molecules in the silica than to the oxygen in neighboring water molecules.
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Classifying Matter by Composition03:35

Classifying Matter by Composition

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Matter: Pure Substances and Mixtures
According to its composition, the matter can be classified into two broad categories — pure substances and mixtures. 
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A composite body is a body made up of multiple parts, connected to form a larger, unified object. Each part has its own weight and center of gravity, which must be considered to determine the center of gravity of the composite body. In cases where the density or specific weight is constant, the center of gravity coincides with the centroid.
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The blood in our bodies comprises three major components: blood plasma, formed elements, and the extracellular matrix. Blood plasma is a yellowish fluid that constitutes 55% of the total blood volume. It is primarily made up of water and essential substances such as electrolytes and proteins. Blood plasma serves as a medium for transporting blood cells and also contains nutrients, enzymes, hormones, antibodies, and gases.
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One-pot polymer-clay composite reversible adhesive.

Adriana Sierra-Romero1, Emmanuel Abotsi1, Katarina Novakovic1

  • 1School of Engineering, Newcastle University, Newcastle Upon Tyne, NE1 7RU, UK. adriana.sierra-romero@newcastle.ac.uk.

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Summary
This summary is machine-generated.

New polymer-clay composites offer reversible adhesion triggered by pH changes. These water-based adhesives enhance product dismantling and recycling efficiency.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Developing sustainable adhesives is crucial for product lifecycle management.
  • Reversible adhesives facilitate easier product disassembly and material recovery.
  • Current adhesives often leave residues, complicating recycling processes.

Purpose of the Study:

  • To create novel water-based polymer-clay composites with tunable reversible adhesion.
  • To investigate the influence of clay type and charge on adhesive properties and rheology.
  • To demonstrate the potential of these composites for enhanced product dismantling and recycling.

Main Methods:

  • Emulsion polymerization was used to synthesize polymer-clay composites.
  • Polyanionic composites incorporated negatively charged montmorillonite.
  • Polycationic composites utilized positively charged hydrotalcite and chitosan stabilization.
  • Adhesion strength was measured using lap shear tests.
  • Rheological properties were analyzed to determine viscosity changes.

Main Results:

  • Both polyanionic and polycationic composites exhibited reversible adhesion triggered by pH.
  • Lap shear strengths exceeded 1 MPa on various substrates.
  • Polycationic composites detached under acidic conditions; polyanionic under alkaline conditions.
  • Polyanionic composites achieved complete substrate detachment without washing.
  • Clay incorporation significantly increased emulsion viscosity (8x and 800x for polyanionic and polycationic, respectively).

Conclusions:

  • The developed polymer-clay composites offer tunable, pH-triggered reversible adhesion.
  • These adhesives are effective on diverse substrates and enhance recyclability.
  • The rheological improvements and clean detachment properties present significant advantages for industrial applications.
  • This technology supports sustainable manufacturing by facilitating product disassembly and improving recycling efficiency.