Based on supramolecular action and dynamic covalent bonds

a hydrogel with shape memory function was prepared. Poly(vinyl alcohol) (PVA) was used as the main body of the hydrogel

and

L

-cysteine (Cys) was grafted onto PVA through an esterification reaction to form a copolymer of

L

-cysteine-polyvinyl alcohol (Cys-PVA). Subsequently

hydroxyethyl cellulose (HEC) was added to introduce a double network structure to improve the mechanical properties of the hydrogel

and to prepare L-cysteine-polyvinyl alcohol/hydroxyethyl cellulose (Cys-PVA/HEC) by combining with Cys- PVA. The results of infrared spectroscopy and nuclear magnetic resonance showed that the reaction molar ratio of PVA to Cys was

n

(PVA)∶

n

(Cys)=1∶1. When the esterification reaction was 18 h

almost all the hydroxyl groups of PVA were grafted with Cys. Scanning electron microscopy (SEM) and BET surface area observed that Cys-PVA/HEC hydrogel has obvious network porous structure. The shape memory test shows that Cys-PVA/HEC hydrogel has multi-response triple shape memory. The mechanical performance test showed that the addition of HEC improved the mechanical performance of Cys-PVA/HEC hydrogel

but also affected its shape memory performance. The hydrogel performance was better when the amount of HEC added was 0.4 g.