Interactive liquid crystal polymers for haptics and soft robotics

Liquid crystal polymer networks provide a versatile platform for creating interactive soft materials because changes in molecular organization can be translated into programmable mechanical, surface, optical, and electrical responses. External stimuli such as light, temperature, and electric fields can induce localized deformation, texture variation, friction modulation, and actuation, enabling materials to dynamically interact with users and their surroundings.

Beyond responding to stimuli, these materials can also be designed to retain information and adapt their future behavior. By incorporating photoswitchable molecular components into aligned liquid crystal polymer networks, functional states can be optically programmed, continuously adjusted, and stored within the material itself. When combined with feedback control, the polymer can be trained to modify its response, process input information, and coordinate the behavior of multiple active elements. The trained state remains encoded in the molecular organization of the material, bringing response, memory, and actuation together within a single soft material platform.

This progression from programmable response to material-embedded memory and training illustrates how liquid crystal polymers can evolve from conventional stimulus-responsive components into adaptive systems that interact, learn, remember, and act. Such materials offer a foundation for future human–machine interfaces, intelligent soft devices, and autonomous material systems.

Acknowledgements

This work was funded by Dutch Research Council NWO OTP 19440, OCENW.KLEIN. 10854, START-UP 8872. The author acknowledges the discussion with Professor Dirk J. Broer.