A Multiple Remotely Controlled Platform from Recyclable Polyurethane Composite Network with Shape-Memory Effect and...

Area of Science:

• Materials Science
• Polymer Chemistry
• Nanotechnology

Background:

• Stimuli-responsive materials offer shape-changing capabilities but suffer from damage and reduced lifespan in complex environments.
• Developing durable, repairable, and recyclable smart materials is crucial for advanced technological applications.

Purpose of the Study:

• To develop a recyclable, remotely controlled shape-changing polyurethane composite with self-healing properties.
• To investigate the effect of magnetite nanoparticles and disulfide bonds on material performance and recyclability.

Main Methods:

• Synthesis of polyurethane composite using polyethylene glycol, polytetrahydrofuran diol, and isophorone diisocyanate.
• Incorporation of magnetite nanoparticles (MNPs) for remote heating via near-infrared irradiation and alternating magnetic fields.
• Introduction of disulfide bonds to enhance self-healing capabilities, analyzed through tensile tests, SEM, and optical microscopy.

Main Results:

• Uniform distribution of MNPs enabled tunable temperature changes and varied shape recovery rates under different stimuli.
• Efficient and rapid self-healing was achieved due to the disulfide bond integration.
• Synergistic effects of transesterification and disulfide bond exchange ensured network reproducibility for recycling.

Conclusions:

• The developed polyurethane composite exhibits excellent remote controllability, self-healing, and recyclability.
• This smart material shows significant promise as an alternative for soft robots and smart sensors.