A photo-driven metallo-supramolecular stress-free reversible shape memory polymer

Soft machines can offer remote-powering mechanisms and mechanical flexibility unmatched by conventional rigid machines. However, the molecular integration of powering and actuation functions in a simple yet versatile format has remained challenging. We achieve this with a semi-crystalline supramolecular metallo-network. The dynamic metallo-bonds offer a flexible mechanism for programming the network anisotropy, which gives rise to stress-free reversible actuation using the crystalline transition as the actuation phase. In addition, the proper choice of metallo-bonds provides suitable photo-thermal capabilities for remote powering without endangering the cyclic actuation stability, despite the supramolecular nature. Based on these principles, we illustrate that the supramolecular network can be programmed into a reptile-style device remotely powered by light. The molecularly integrated dual functionality based on supramolecular metallo-bonds provides an attractive option for the future design of soft machines with sophisticated morphing behaviors yet simple powering mechanisms.

Automated summary

The article discusses the molecular integration of powering and actuation functions in soft machines using a semi-crystalline supramolecular metallo-network, providing remote-powering mechanisms and mechanical flexibility. Proper choice of metallo-bonds also offers photo-thermal capabilities. This technology provides a new approach for the future design of soft machines.