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POSTER PRESENTATION
Tuesday, 15:40, Panel No. 5
Acceleration of Relaxation of an Entangled Polymer Chain in a Melt by Confinement into a Slit
K. Hagita1, H. Takano2
1 Department of Applied Physics, National Defense Academy, Japan
2 Department of Physics, Keio University, Japan
Relaxation modes and rates of a polymer chain in a melt confined into a slit by repulsive walls are studied by Monte Carlo simulations of the bond fluctuation model, where only the excluded volume interaction is taken into account. Reduction of the glass transition temperatures Tg, which means a decrease of the relaxation time, of unentangled chains in thin polymer films as the films become thinner has been examined by experiments and simulations. Polymer chains of N segments are located on an L x L x W simple cubic lattice under periodic boundary conditions in the x- and y-directions. The N- and W-dependences of the longest relaxation time are examined for N = 32 -- 512 and W = 8, 16, 32 and 64 at the volume fraction 0.5. For W = 8, the relaxation time of a polymer chain of N=512 segments is shorter than that in the bulk. The apparent exponent of the power law dependence of the relaxation time on N is estimated to be 2.8 for N=256 and 512, while the apparent exponent in the bulk is 3.5. © IWNET 2006
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and Kleanthi for IWNET 2006