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Related Experiment Video

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High Performance Shape Memory Epoxy/Carbon Nanotube Nanocomposites.

Yayun Liu1,2, Jun Zhao2, Lingyu Zhao2,3,4

  • 1School of Engineering and Technology, China University of Geosciences (Beijing) , Beijing 100083, China.

ACS Applied Materials & Interfaces
|December 8, 2015
PubMed
Summary

This study developed advanced shape memory nanocomposites using diglycidyl ether of bisphenol A (DGEBA) and multiwalled carbon nanotubes (MWCNTs). The materials exhibit enhanced mechanical properties and rapid shape recovery, making them suitable for aerospace applications.

Keywords:
carbon nanotubecuringepoxynanocompositeshape memory polymer

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Shape memory polymers (SMPs) are advanced materials with the ability to recover their original shape when subjected to a stimulus.
  • Incorporating nanomaterials can enhance the properties of SMPs, leading to improved performance for demanding applications.

Purpose of the Study:

  • To fabricate and investigate shape memory nanocomposites based on diglycidyl ether of bisphenol A (DGEBA) E51/methylhexahydrophthalic anhydride (MHHPA)/multiwalled carbon nanotube (MWCNT).
  • To systematically study the effect of stoichiometric ratios and MWCNT filler content on the morphology, curing kinetics, phase transition, mechanical properties, thermal conduction, and shape memory behaviors.

Main Methods:

  • Fabrication of nanocomposites with varying DGEBA/MHHPA stoichiometric ratios (0.5–1.2) and MWCNT filler content (0.25, 0.75 wt %).
  • Systematic investigation of material properties including morphology, curing kinetics, phase transition (glass transition temperature, Tg), mechanical properties (flexural modulus, maximum stress, strain at break), thermal conduction, and shape memory behavior (recovery rate, stability).

Main Results:

  • The nanocomposites exhibited a wide range of glass transition temperatures (Tg) from 65–140 °C.
  • High mechanical properties were achieved: flexural modulus up to 3.0 GPa, maximum stress up to 30 MPa, and strain at break above 10%.
  • A fast shape recovery time of 32 seconds was observed, with 0.75 wt % MWCNT significantly enhancing mechanical properties, recovery rate, and cycle stability near Tg.

Conclusions:

  • The developed DGEBA/MHHPA/MWCNT nanocomposites demonstrate excellent shape memory properties and mechanical performance.
  • The addition of a small amount of MWCNT significantly improves key material characteristics, including shape recovery and mechanical strength.
  • These advanced nanocomposites show significant promise for applications in aerospace and other high-performance fields.