Abstract
Shape memory materials (SMM) are the materials that recover upon external stimulus such as light, electric, temperature, moisture, magnetic field, which find their applications in several fields which include medical, electrical, aerospace, actuators, textile, automobile and many more. This review paper discusses about the applications and their challenges (like rate of degradation, degree of toxicity)in bio-medical and aerospace technologies. Based on the literature review, it is found that the use of water reagent can reduce toxicity to some extent in hydrophilic stimulus polymers and the addition of cellulose nanowhiskers in poly-ethylene-glycol (PEG) has improved the rate of degradation. These applications require extensive research to eliminate the problems
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