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Related Concept Videos

Plasticizers01:31

Plasticizers

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Water-reducers, or plasticizers, are chemical admixtures used in concrete to improve strength and workability. These additives reduce the water-cement ratio without compromising workability, lower the cement content while maintaining the same workability, or increase workability to assist concrete placement in inaccessible areas.
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Superplasticizers are advanced admixtures that enhance the workability of concrete by lowering the water content without compromising the strength of the material. These substances are highly effective water reducers, improving concrete flow, making it easier to work with, and enabling concrete to reach inaccessible areas or densely reinforced sections without mechanical vibration. The key components in superplasticizers are either sulfonated melamine or naphthalene formaldehyde condensates,...
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Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
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A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
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Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
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Plasticity is the property where an object loses its elasticity and undergoes irreversible deformation, even after the deformation forces are eliminated. If a material deforms irreversibly without increasing stress or load, then this is called ideal plasticity. For example, when a force is applied to an aluminum rod, it changes its shape, but it does not return to its original shape once the force is removed. Plastic deformation or ductility is thus a permanent deformation or change in the...
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Casting Protocols for the Production of Open Cell Aluminum Foams by the Replication Technique and the Effect on Porosity
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Mineral plastic foams.

Philipp Menold1, Helmut Cölfen, Cosima Stubenrauch

  • 1Physical Chemistry, University of Konstanz, Universitätsstraße 10, 78457 Konstanz, Germany. helmut.coelfen@uni-konstanz.de.

Materials Horizons
|November 25, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed a mechanically stable, non-flammable foam from poly(acrylic acid) and calcium. This "mineral plastic" foam is recyclable in acidic solutions and features a tailorable structure.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Foam Technology

Background:

  • Development of novel materials with enhanced stability and safety is crucial.
  • Poly(acrylic acid) (PAA) and its salts offer versatile properties for material synthesis.
  • Creating stable, non-flammable foams with tunable structures presents a significant challenge.

Purpose of the Study:

  • To synthesize a mechanically stable, non-flammable foam using poly(acrylic acid) and calcium.
  • To investigate the feasibility of tailoring the foam's structure.
  • To establish a method for recycling the synthesized foam.

Main Methods:

  • Foaming of a poly(acrylic acid)-containing aqueous solution with calcium.
  • Gelation of the continuous foam phase to stabilize the structure.
  • Drying of the resulting hydrogel foam to obtain the solid foam.

Main Results:

  • Successful synthesis of a mechanically stable, non-flammable poly(acrylic acid)-calcium salt foam.
  • Achieved tunable foam structures with pore sizes around 220 μm.
  • Demonstrated easy dissolution and recyclability of the foam in acidic solutions.

Conclusions:

  • A viable route for producing stable, non-flammable mineral plastic foams has been established.
  • The synthesized foams offer potential for sustainable material applications due to their recyclability.
  • The method allows for control over foam structure, opening avenues for customized material design.