Shape-memory polymers

PLA belongs to the well-known shape-memory polymers which can be used, e.g., to completely modify the geometry of open-pore 3D printed PLA objects and afterwards restore the original shape by warming up the object.

Recently, poly(ethylene glycol) (PEG) was also found to show shape-memory properties. Using PEG with different low molecular weights, the materials were chain-end functionalized with isocyanate ethyl methacrylate and UV-photo-cured, resulting in nearly complete cross-linking. In 3-point bending tests, nearly 100 % strain fixity rates were found.