4D Printing of Polyethylene Glycol‐Grafted Carbon Nanotube‐Reinforced Polyvinyl Chloride–Polycaprolactone Composites for Enhanced Shape Recovery and Thermomechanical Performance

4D printing with carbon nanotube (CNT)‐reinforced polymers enables advanced shape‐changing materials but faces challenges in CNT dispersion and performance. This study addresses these limitations by functionalizing CNTs with polyethylene glycol (PEG), significantly enhancing dispersion and interfacial bonding within biocompatible polyvinyl chloride (PVC)‐polycaprolactone (PCL) composites. The composites, tailored for biomedical applications with a glass transition temperature (T g ) of 37–41 °C, exhibit enhanced mechanical, thermal, and shape‐memory properties. At 0.5 wt% CNT, the composite achieves a 25% increase in tensile strength, 95.78% shape fixity, and a 5‐s recovery time, offering an optimal balance of…