METHOD FOR ANALYZING MOLECULAR MOTION OF BRANCHED LONG CHAIN POLYMER

A method for analyzing molecular motion of a branched long chain polymer wherein the position coordinate, the orientation vector, the number of monomers in the constituent elements of a tube and counterpart tube constituent elements forming entanglement are time-developed over a unit time defined by expression 7 according to the Langevin equation defined by expression 1 on the basis of the reptation theory with regard to an inter-tube constituent element constituting each polymer produced by coarse-graining the polymers of a mixture of the branched long chain polymer material to be analyzed according to the entanglement molecular weight (step 201), the number of monomers in the constituent element of the tube is time-development according to expression 5 (step 202), the number n of monomers in the constituent element of the tube at each end of a polymer is monitored, the constituent element of the counterpart tube forming entanglement is altered according to expression 8, and geometrical position exchange is caused to take place between the entanglement and a branch point by the number of constituent element of the tube at a branch part belonging to the branch point