高分子液体のダイナミックスとレオロジー

抄録

This article is author's personal recollection of his research on dynamics and rheology of polymeric liquids carried through the last forty years. It describes particularly (1) his earlier study on Weissenberg effect of concentrated polymer solutions, (2) solution rheology of styrene (S) and butadiene (B) rubbers including SB-block copolymers in mixed solvent with varying selectivity, and finally (3) very recent work with Adachi at Osaka on dielectric normal mode spectroscopy of dilute blends of probe polyisoprene (PI) in matrix polybutadiene (PB). The major results were (1) the discovery of M-independent compliance of entangled polymer solutions;(2) plastic flow behavior of SB-diblock copolymer solution in a selective solvent decane presumably due to the formation of a crystalline structure of the block copolymer micelles with S cores and B cilia; and (3) the identification of Rouse-like behavior in high M-PI/low M-PB blends and pure reptation behavior (with M³-dependent relaxation time) in low M-PI/high M-PB blends. These results suggest that in the relaxation of monodisperse entangled melt the contour length fluctuation is probably unimportant but rather the relaxation proceeds through pure reptation accelerated by constraint release via tube renewal.