Design of Multi-Stimuli-Responsive Shape Memory Biobased PLA/ENR/Fe3O4 TPVs with Balanced Stiffness-Toughness Based on Selective Distribution of Fe3O4

摘要

In this work, multi-stimuli-responsive shape memory PLA/epoxidized natural rubber (ENR)/ferriferrous oxide (Fe3O4) thermoplastic vulcanizates (TPVs) with balanced stiffness toughness were designed via dynamic vulcanization. Regulated by thermodynamic factors and kinetic factors, Fe3O4 was selectively distributed in the continuous ENR phase or at the PLA/ENR interface, which played a crucial role in reinforcing rubber and interfacial compatibilization. Therefore, excellent multi-stimuli-responsive shape memory behavior and significantly improved impact strength were achieved without decreasing its tensile strength. With 30 phr Fe3O4, impact strength reached 90.08 kJ/m(2) (without fracture), which was 31 times that of neat PLA. Meanwhile, the TPVs could recover their original shape in merely several seconds along with the shape recovery ratio of 96.63% in the thermal field. Additionally, Fe3O4 also endowed the TPVs with a magnetic-/light-induced shape memory effect in an alternating magnetic field and under the near-infrared light (808 nm) irradiation, which exhibited great potential in intelligent biomedical areas.