Heat-Responsive PLA/PU/MXene Shape Memory Polymer Blend Nanocomposite: Mechanical, Thermal, and Shape Memory...

Area of Science:

• Materials Science
• Polymer Science
• Nanotechnology

Background:

• Shape memory polymers (SMPs) offer tunable recovery properties.
• Polymer blends and nanocomposites enhance mechanical and thermal characteristics.
• MXene incorporation can improve polymer matrix properties.

Purpose of the Study:

• To fabricate and characterize heat-responsive polylactic acid (PLA)/polyurethane (PU)/MXene shape memory polymer blend nanocomposites.
• To investigate the effect of varying PLA content on the mechanical, thermal, and shape memory properties.
• To determine the optimal composition for enhanced performance.

Main Methods:

• Fabrication of PLA/PU/MXene nanocomposites with varying PLA content (10-50%) and fixed 0.5 wt.% MXene.
• Mechanical testing: ultimate tensile strength, % elongation, flexural strength.
• Microstructural analysis (SEM), Differential Scanning Calorimetry (DSC), Thermogravimetric Analysis (TGA).
• Shape memory testing to evaluate shape fixity and recovery.

Main Results:

• The 50% PLA/PU/MXene blend showed a 300% increase in ultimate tensile strength and 400% increase in flexural strength.
• Crystallinity increased from 33% (PU) to 45% (50% blend), and thermal stability improved (onset T: 185°C to 212°C).
• The 30% PLA/PU/MXene blend exhibited the best shape fixity and recovery, with higher PLA content reducing shape memory efficiency.

Conclusions:

• PLA/PU/MXene nanocomposites demonstrate significantly enhanced mechanical and thermal properties.
• Optimal shape memory performance is achieved at 30% PLA content.
• The study provides insights into designing advanced shape memory polymer nanocomposites for specific applications.