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Shape memory effect characterisation of PLA-HAp composite. (a) 3D shape memory cycle contains four stages (I, II, III and IV), representing loading, cooling, unloading and heating; (b) 2D WAXS patterns for stage II cooling from 70 °C to 22 °C and stage IV heating from 22 °C to 70 °C, showing the appearance of strong diffraction from crystal structure (highlighted in red dashed circle).
