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Acetylated Nanocelluloses Reinforced Shape Memory Epoxy with Enhanced Mechanical Properties and Outstanding Shape

Tianyu Yu1, Feilong Zhu1, Xiongqi Peng1

  • 1School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, China.

Nanomaterials (Basel, Switzerland)
|December 11, 2022
PubMed
Summary
This summary is machine-generated.

This study enhances shape memory polymers (SMPs) by incorporating acetylated nanocelluloses (ANCs), significantly improving toughness and mechanical properties. The resulting nanocomposites offer better performance for intelligent applications.

Keywords:
acetylationnanocellulosenanocompositeshape memory epoxythermomechanical property

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Area of Science:

  • Materials Science
  • Polymer Science

Background:

  • Shape memory polymers (SMPs) offer large deformation and programmability but suffer from poor toughness and brittleness.
  • These limitations hinder their use in advanced applications like flexible electronics and smart textiles.

Purpose of the Study:

  • To enhance the toughness and mechanical properties of epoxy-based shape memory polymers.
  • To investigate the effect of nanocellulose reinforcement and surface modification on shape memory behavior.

Main Methods:

  • Fabrication of shape memory epoxy-based nanocomposites (SMEPNs) using nanocelluloses (NCs).
  • Acetylation modification of NCs to improve compatibility with the epoxy matrix.
  • Characterization of mechanical properties, including toughness, elastic modulus, and fracture strain.

Main Results:

  • Incorporation of acetylated nanocelluloses (ANCs) enhanced storage modulus and maintained the shape memory effect (SME).
  • A loading of 0.06 wt.% ANCs resulted in over 42% toughness improvement, enhanced fracture strain, elastic modulus, and ultimate strength.
  • Nanoscale ANCs effectively hindered crack propagation without compromising macromolecular mobility.

Conclusions:

  • Acetylation modification successfully ameliorated the incompatibility between NCs and epoxy matrix.
  • The developed SMEPNs exhibit superior toughness and mechanical performance, alongside excellent shape memory properties.
  • These findings pave the way for advanced intelligent applications of shape memory materials.