In this work, poly(2-ethyl-2-oxazoline) (PEtOx) is crosslinked to realize a moisture-and thermo-responsive shapememory polymer. The obtained PEtOx networks exhibit excellent shape-memory properties with storable strains of up to 650% and recovery values of 100% over at least 10 shapememory cycles. The trigger temperature (T trig ) of 68 C of a PEtOx network at a relative humidity (RH) of 0% decreases with increasing moisture and equals room temperature at an RH of 40%. Thus, programmed PEtOx networks trigger sensitively on a certain temperature/moisture combination and, further, can be programmed as well as triggered at room temperature exclusively by varying humidity.
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