Abstract
We investigated the order−order transition (OOT) and the order−disorder transition (ODT) in a polystyrene-block-polyisoprene-block-polystyrene copolymer (Vector 4111, Dexco Polymers Co.), which has a weight-average molecular weight of 1.4 × 105 and a 0.183 weight fraction of polystyrene (PS) blocks, using small-angle X-ray scattering (SAXS) and rheological measurements. Specifically, SAXS experiments reveal that Vector 4111 undergoes an OOT at 179−185 °C with (i) hexagonally-packed cylindrical microdomains of PS at T ≤ 179 °C, (ii) the coexistence of cylindrical and spherical microdomains of PS at 180 °C ≤ T ≤ 185 °C, and (iii) spherical microdomains of PS in a cubic lattice at 185 °C < T ≤ 210 °C, and (iv) the cubic lattice of the spheres is distorted with a further increase of temperature so that the lattice disordering transition occurs at temperatures between 210 (onset) and 214 °C (completion) and the spherical microdomain structure of PS with a liquidlike short-range order persists even up to 220 °C...
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
