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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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Humidity-activated shape memory effect on plasticized starch-based biomaterials.

Valentina Sessini1, Marina P Arrieta2, Alberto Fernández-Torres2

  • 1Dipartimento di Ingegneria Civile e Ambientale, Università di Perugia, Strada di Pentima, 05100, Terni, Italy; Instituto de Ciencia y Tecnología de Polímeros, ICTP-CSIC, Calle Juan de la Cierva 3, 28006, Madrid, Spain.

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Summary
This summary is machine-generated.

Plasticized starch films with starch nanocrystals (SNCs) and catechin exhibit humidity-activated shape memory. This combination enhances film properties for potential biomedical applications.

Keywords:
BendingCatechinHumidityShape memoryStarch

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Area of Science:

  • Materials Science
  • Polymer Science
  • Biomaterials Engineering

Background:

  • Starch-based films are being explored for various applications.
  • Previous work demonstrated enhanced thermal and mechanical properties of starch films with SNCs and catechin.
  • Understanding humidity-activated shape memory is crucial for developing smart materials.

Purpose of the Study:

  • To characterize the humidity-activated shape memory behavior of plasticized starch-based films.
  • To investigate the influence of starch nanocrystals (SNCs) and catechin on these shape memory properties.
  • To evaluate the antioxidant effectiveness of catechin and the thermo-mechanical relaxation of the materials.

Main Methods:

  • Preparation of plasticized starch-based films incorporating SNCs and catechin.
  • Characterization of moisture absorption and desorption kinetics.
  • Assessment of shape memory behavior under humidity changes.
  • Evaluation of antioxidant stability and thermo-mechanical properties.

Main Results:

  • The developed starch-based films exhibit excellent humidity-activated shape memory behavior.
  • Incorporation of SNCs and catechin significantly influences moisture management and shape recovery.
  • Catechin enhances polymer stability against oxidative stress.
  • The composite films show increased hydrophilicity.

Conclusions:

  • The combination of SNCs and catechin in plasticized starch films creates a multifunctional material.
  • These films possess superior humidity-activated shape memory properties.
  • The enhanced hydrophilicity and stability make them promising for biomedical applications.