METHOD FOR ANALYZING MOLECULAR MOTION OF COPOLYMER

A method for analyzing molecular motion of a copolymer comprising a step for time-developing the constitutional element of an associated tube forming positional coordinates, an orientation vector, number of monomers in the constitutional elements of a tube and an entanglement over a unit time defined by expression 7 according to Langevin equation defined by expression 1 with regard to an inter-tube constitutional element constituting each polymer produced by coarse-graining the polymer of a mixture of a copolymer material to be analyzed based on the inter-entanglement molecular weight based on reptation theory (step 201), and a step for time-developing the number of monomers in the constitutional element of tube according to expression 5 (step 202) wherein the number n of monomers in the constitutional element of tube at each end of a polymer is monitored, the constitutional element of an associated tube forming an entanglement is altered according to expression 8, and geometrical positional exchange is caused to take place between the entanglement and a branch point by the number of constitutional elements of a tube at a branch part belonging to the branch point.