|Budget Amount *help
¥1,500,000 (Direct Cost : ¥1,500,000)
Fiscal Year 1995 : ¥500,000 (Direct Cost : ¥500,000)
Fiscal Year 1994 : ¥1,000,000 (Direct Cost : ¥1,000,000)
Long chain molecules, such as polymers and lipids, show various structures in condensed states (crystals, liquid crystals, micells, liquids, etc) and their dynamic structures are of particular interest. In this project, we have investigated the structure formation processes in long chain systems with particular interest in the dynamical structure of the interfaces.
1.Before investigation of the polymer ordering process, we have studied the structures of the solid-liquid interface by use of the computer simulation method. We have found a remarkably large disorder in the crystal surfaces and also an appreciable order in the melt near the interfaces.
2.Polymer crystallization processes were investigated by molecular dynamics simulation. The microscopic processes of the chain folded crystallization and the lamellar thickening were clarified.
3.The interdiffusion of the n-alkane molecules in the crystals were studied in situ through the optical microscopy, which was enabled by use of the mixing induced solid-state phase transformation into the rotator phase.
4.The solid-state phase transitions at low temperature were investigated by x-ray diffraction method. We have confirmed a new crystalline transition, which was found to have an origin in the onset of the chain end disordering at the interlamellar region.