Abstract
We investigated the order−order and order−disorder transitions in a solution consisting of polystyrene-block-polyisoprene-block-polystyrene copolymer (Vector 4111 having weight-average molecular weights of 26 × 103 and 117 × 103 for polystyrene and polyisoprene block chains, respectively) and dioctyl phthalate (DOP), using small-angle X-ray scattering (SAXS), rheology, and transmission electron microscopy (TEM). SAXS results obtained in a heating process show (a) that, in the 85.5/14.5 weight fraction Vector 4111/DOP solution, (1) an order−order transition (OOT) takes place at 130−140 °C, (2) a lattice-disordering transition (LDT) takes place at 150−155 °C, and (3) an order−disorder transition (ODT) takes place at ca. 205 °C and (b) that, in the 73.2/26.8 Vector 4111/DOP solution, (1) an OOT takes place at 80−90 °C, (2) no LDT takes place because the structure formed after the OOT contains a considerable amount of lattice distortion, and (3) an ODT takes place at ca. 130 °C. Both SAXS and TEM results show...
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