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The reversible color phase transitions between the blue phase and the red phase caused by annealing have been reported for Langmuir-Blodgett polydiacetylene (LB PDA) films. We have already proposed an application of the LB PDA films to optical devices. In this paper, the reversible color phase transitions are investigated for the LB PDA films, that are pre-annealed before polymerization in order to improve the characteristics of the films. Absorption spectra of the LB PDA films without pre-annealing have main peaks at 640nm, while the spectra of the preannealed films have new main peaks at 704nm. The new peaks at 704nm exhibit stronger reversibility of the color phase transition than the peaks at 640nm. Moreover, X-ray diffraction measurements show that the pre-annealed LB PDA films have extremely ordered layer structures. Pre-annealing is thought to be an important technique for improving characteristics of LB films.

Pre-Annealing Properties of Langmuir-Blodgett Polydiacetylene Thin Films