Hwanga, JY Huh, J Jung, B Hong, JM Park, M Park, C 2024-01-21T04:10:14Z 2024-01-21T04:10:14Z 2021-09-03 2005-10-07 0032-3861 https://pubs.kist.re.kr/handle/201004/136054 Microstructures of hundreds of micron thick poly(styrene-block-isoprene) copolymer films solution-cast in a cylindrical tube with the solvent evaporation controlled were investigated by transmission electron microscope (TEM), small angle X-ray scattering (SAXS) and optical microscope (OM). In a block copolymer with cylindrical polyisoprene microdomains, the orientation of the cylinders was varied along radial direction of the cylindrical tube. Highly aligned hexagonal arrays of in-plane polyisoprene cylinders were formed with their cylindrical axis parallel to the circumference of the tube in the regimes close to the wall edge. In contrast randomly ordered microdomains were observed at the center of the tube. We have also found that the orientation depends on the solvent evaporation rate and an intermediate rate (similar to 2.3 nL/s) provides the best orientation. In the case of a block copolymer with a bicontinuous double gyroid structure, we obtained a globally ordered microstructure where [111] crystallographic direction was parallel to the circumference of the tube. For both block copolymers, the area of highly ordered arrays of nanoscopic domains is over 1 mm(2). Development of the orientation was explained by coupling two orthogonal fields: (1) The flow of a solution induced by strong capillary force at a meniscus between the cylindrical tube wall and the block copolymer solution and (2) the solvent evaporation. (c) 2005 Elsevier Ltd. All rights reserved. English ELSEVIER SCI LTD TO-GYROID TRANSITION DIBLOCK COPOLYMERS MICRODOMAIN ARRAYS ORIENTATION FILMS NANOSTRUCTURES NANOTECHNOLOGY SOLIDIFICATION MORPHOLOGY Highly ordered microstructures of poly (styrene-b-isoprene) block copolymers induced by solution meniscus Article 10.1016/j.polymer.2005.06.070 1 POLYMER, v.46, no.21, pp.9133 - 9143 POLYMER 46 21 9133 9143 scie scopus 000232172900025 2-s2.0-24944522796 Polymer Science Polymer Science Article TO-GYROID TRANSITION DIBLOCK COPOLYMERS MICRODOMAIN ARRAYS ORIENTATION FILMS NANOSTRUCTURES NANOTECHNOLOGY SOLIDIFICATION MORPHOLOGY poly(styrene-b-isoprene) block copolymer microstructure orientation solution meniscus