Stimuli-responsive polypeptides are polymeric materials switching their conformation and/or chemical composition in response to external stimulus. In this review
we briefly introduce the synthetic method of polypeptides via the ring-opening polymerization of
α
-amino acid
N
-carboxyanhydrides (NCAs) and summarize stimuli responsive polypeptides in recent years in terms of redox
temperature
pH and light. Their applications in drug delivery and biotechnology are also discussed.