title: Formation of undulated lamellar structure from ABC block terpolymer blends with different chain lengths.
abstract: The effect of molecular weight distribution of ABC linear terpolymers on the formation of periodic structures was investigated. Three poly(isoprene-b-styrene-b-2-vinylpridine) triblockterpolymers with molecular weights of 26k, 96k, and 150k were blended variously. Three-phase, four-layer lamellar structures were observed when polydispersity index (PDI) was low, but it has been found that simple lamellar structure with flat surface transforms into an undulated lamellar one, where two interfaces, i.e., I/S and S/P, are both undulated, and they are synchronizing each other if PDI exceeds the critical value. This new structure could be formed due to the periodic and "weak" localization of three chains along the domain interfaces, which produces periodic surfaces with nonconstant mean curvatures. With further increase of PDI, the blend macroscopically phase-separated into different microphase-separated structures.
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan. yushu@apchem.nagoya-u.ac.jp
authors.forename: Yushu
authors.initials: Y
authors.lastname: Matsushita
authors.forename: Jiro
authors.initials: J
authors.lastname: Suzuki
authors.forename: Yuuki
authors.initials: Y
authors.lastname: Izumi
authors.forename: Kohei
authors.initials: K
authors.lastname: Matsuoka
authors.forename: Shuji
authors.initials: S
authors.lastname: Takahashi
authors.forename: Yoshitaka
authors.initials: Y
authors.lastname: Aoyama
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Mihira
authors.forename: Atsushi
authors.initials: A
authors.lastname: Takano