Title: MONTE CARLO AND MOLECULAR DYNAMICS STUDIES FOR THE COLOUR REWRITABLE FILMS
Author(s): H.Okajima, T.Kawamura, C.Kongo, Y.Hiwatari (Department of Computational Science, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan), N.Urakami (Department of Physics, Biology, and Informatics, Yamaguchi University, Yamaguchi, 753-8512, Japan), R.Hayashi (School of Information Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Tatsunokuchi, Nomi, Ishikawa 923-1292, Japan), K.Kato (RICOH Company, Ltd. Chemical Products R&D Ctr., 16-1 Honda-machi, Numazu-city, Shizuoka, 410-0004, Japan)

The structure of the developers plays an important role in the colouring/decolouring process for the colour rewritable films. We study the chain-like polymers structure of the developer through both the Monte Carlo and molecular dynamics simulations. In these simulations we focus our attention on the thermal (temperature) effects as well as the effective interaction between developers (chain-like polymers), and with these how the lamellar structure can be constructed when the system is quenched from high temperature (low density) to low temperature (high density). We found the transition of the states from a disordered state to an aggregated state at a temperature (282 K). We obtained the lamellar structure in a preferable condition of the potential parameter, while in either smaller or larger interactions, it is rather difficult for the developer chains to form lamellar structures.

Key words: colour rewritable film, leuco dye, developer, lamellar structure, Monte Carlo simulation, molecular dynamics simulation
PACS: 05.70.Jk