Highly ordered microstructures of poly(styrene-b-isoprene) block copolymers induced by solution meniscus

Jiyoung Hwang, June Huh, Bumsuk Jung, Jae Min Hong, Min Park, Cheolmin Park

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

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 (∼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 mm2. 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.

Original languageEnglish
Pages (from-to)9133-9143
Number of pages11
JournalPolymer
Volume46
Issue number21
DOIs
Publication statusPublished - 2005 Oct 7
Externally publishedYes

Fingerprint

Isoprene
Styrene
Block copolymers
Polyisoprenes
Evaporation
Microstructure
X ray scattering
Microscopes
Electron microscopes
Copolymers
isoprene
Direction compound

Keywords

  • Microstructure orientation
  • Poly(styrene-b-isoprene) block copolymer
  • Solution meniscus

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

Cite this

Highly ordered microstructures of poly(styrene-b-isoprene) block copolymers induced by solution meniscus. / Hwang, Jiyoung; Huh, June; Jung, Bumsuk; Hong, Jae Min; Park, Min; Park, Cheolmin.

In: Polymer, Vol. 46, No. 21, 07.10.2005, p. 9133-9143.

Research output: Contribution to journalArticle

Hwang, Jiyoung ; Huh, June ; Jung, Bumsuk ; Hong, Jae Min ; Park, Min ; Park, Cheolmin. / Highly ordered microstructures of poly(styrene-b-isoprene) block copolymers induced by solution meniscus. In: Polymer. 2005 ; Vol. 46, No. 21. pp. 9133-9143.
@article{c5af08a5b8ca43828ede8080313b933b,
title = "Highly ordered microstructures of poly(styrene-b-isoprene) block copolymers induced by solution meniscus",
abstract = "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 (∼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 mm2. 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.",
keywords = "Microstructure orientation, Poly(styrene-b-isoprene) block copolymer, Solution meniscus",
author = "Jiyoung Hwang and June Huh and Bumsuk Jung and Hong, {Jae Min} and Min Park and Cheolmin Park",
year = "2005",
month = "10",
day = "7",
doi = "10.1016/j.polymer.2005.06.070",
language = "English",
volume = "46",
pages = "9133--9143",
journal = "Polymer (United Kingdom)",
issn = "0032-3861",
publisher = "Elsevier BV",
number = "21",

}

TY - JOUR

T1 - Highly ordered microstructures of poly(styrene-b-isoprene) block copolymers induced by solution meniscus

AU - Hwang, Jiyoung

AU - Huh, June

AU - Jung, Bumsuk

AU - Hong, Jae Min

AU - Park, Min

AU - Park, Cheolmin

PY - 2005/10/7

Y1 - 2005/10/7

N2 - 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 (∼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 mm2. 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.

AB - 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 (∼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 mm2. 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.

KW - Microstructure orientation

KW - Poly(styrene-b-isoprene) block copolymer

KW - Solution meniscus

UR - http://www.scopus.com/inward/record.url?scp=24944522796&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=24944522796&partnerID=8YFLogxK

U2 - 10.1016/j.polymer.2005.06.070

DO - 10.1016/j.polymer.2005.06.070

M3 - Article

AN - SCOPUS:24944522796

VL - 46

SP - 9133

EP - 9143

JO - Polymer (United Kingdom)

JF - Polymer (United Kingdom)

SN - 0032-3861

IS - 21

ER -