Abstract
Three different self-assembled nanostructures, i.e., lamellar (Lam), hexagonally close-packed cylinder (Hex), and body-centered cubic (BCC), have been obtained from ABA triblock (MH-b-PCL-b-MH) and A2B star-branched copolymers ((MH)2-b-PCL) consisting of maltoheptaose (MH, as the A block) and polycaprolactone (PCL, as the B block). MH-b-PCL-b-MH and (MH)2-b-PCL were synthesized by the click reaction of the α,ω-diazido and α,α-diazido end-functionalized PCLs with N-maltoheptaosyl-3-acetamido-1-propyne in high yields. The self-assembled nanostructures of the block copolymers (BCPs) in bulk were investigated as a function of temperature by time-resolved small-angle X-ray scattering using a synchrotron light source. The SAXS analysis revealed that the obtained BCPs exhibited microphase-separated structures with the domain-spacing of 10.4–21.0 nm. MH-b-PCL-b-MH (the MH volume fraction (ϕMH) of 0.28 and 0.15) exhibited a hexagonally close-packed cylinder (Hex) at below ca. 230 °C, and the self-assembling behavi...
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