Capsaicin was successfully intercalated into layered double hydroxide (LDH) by coprecipitation and ion-exchange method. The intercalation of capsaicin was confirmed by XRD, FT-IR, and elemental analysis. It was confirmed by XRD that the basal spacing of the host LDH increased from 0.88 to 1.50 nm after the intercalation of capsaicin into the LDH. Capsaicin-intercalated LDH (LDH-Cap) powder was readily dispersed in polymer materials such as silicone rubber, acrylic lacquer, epoxy lacquer, and polystyrene to produce composites filled with LDH-Cap. It was found that the amount of released capsaicin from the composite materials was controlled by intercalation into LDH. The composites possess bio-repellent properties against acorn barnacle and protective ability against rat gnawing damage.
