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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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Shape memory starch-clay bionanocomposites.

Gildas Coativy1, Nicolas Gautier2, Bruno Pontoire3

  • 1LUNAM Université, CNRS, GEPEA, UMR 6144, CRTT, 37, Boulevard de l'Université, 44606 St Nazaire Cedex, France; UR1268 Biopolymères Interactions Assemblages, INRA, F-44300 Nantes, France; Structure Fédérative IBSM, INRA Nantes-Angers, Rue de la Géraudière, BP 71627, 44316 Nantes Cedex 3, France.

Carbohydrate Polymers
|December 3, 2014
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Summary
This summary is machine-generated.

Starch/clay bionanocomposites exhibit shape memory properties, enhanced mechanical strength, and improved stress recovery. These materials show potential for advanced sensors and actuators.

Keywords:
BionanocompositeClayMelt processingShape memoryStarch

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Area of Science:

  • Materials Science
  • Polymer Science

Background:

  • Starch-based materials are biodegradable but often lack mechanical strength.
  • Incorporating nanoparticles can enhance polymer properties.
  • Shape memory polymers offer unique functional capabilities.

Purpose of the Study:

  • To develop starch/clay bionanocomposites with shape memory properties.
  • To investigate the effect of clay nanoparticles on material characteristics.
  • To evaluate the shape memory performance and mechanical enhancement.

Main Methods:

  • Melt processing of starch/clay mixtures.
  • X-ray diffraction (XRD) and Transmission Electron Microscopy (TEM) for structural analysis.
  • Tensile testing above the glass transition temperature.
  • Shape memory testing involving elongation, cooling, and recovery.

Main Results:

  • Bionanocomposites contained clay tactoids (4-5 layers, 6.8 nm thick) with nanoparticle orientation.
  • Clay addition increased elastic modulus and maximum stress, maintaining elongation at break (~100%).
  • Shape memory behavior was observed, with improved maximum recovered stress under constrained conditions.

Conclusions:

  • Starch/clay bionanocomposites possess enhanced mechanical properties and shape memory effects.
  • Nanoparticle reinforcement significantly improves stress recovery, crucial for actuator applications.
  • These materials offer promising avenues for developing novel sensors and actuators.