Presentation Information
[11a-B12-8]Control of PDMS Network Connectivity by Light Intensity
〇Satoru Ohisa1, Genichi Motomura1, Kazuaki Rikiyama1, Yasuyoshi Miyamoto1, Norihiko Ishii1, Kei Hagiwara1, Nobuhiro Kinoshita1 (1.NHK STRL)
Keywords:
photoresponsive material,transient network
In this study, we improved the photoresponsive polymer PDMS–HABI, enabling reversible, spatially controlled stiffness tuning via light. The material exhibits up to a 50-fold reduction in stiffness under blue light. Rheological analysis shows a transition from solid-like to liquid-like behavior, with the storage modulus decreasing by over an order of magnitude. The scaling exponents vary continuously with light intensity below the frequency of 0.16 Hz, indicating an Winter-Chambon critical gel-like state around 10–25 mW/cm². Furthermore, the crossover frequency can be widely tuned, demonstrating that both network structure and relaxation dynamics are controllable by light. These findings highlight a new strategy for manipulating soft material states and suggest potential applications in reconfigurable actuators and haptic systems.