Large area orientation of block copolymer microdomains in thin films via directional crystallization of a solvent

Cheolmin Park, Claudio De Rosa, Edwin L. Thomas

Research output: Contribution to journalArticle

89 Citations (Scopus)

Abstract

A fast method for inducing alignment of microdomains in noncrystalline block copolymers is presented. The method is based on the use of crystalline organic materials, which are solvents for the block copolymers above their melting temperatures, and, when cooled and directionally crystallized, act as a substrate on which thin films of the block copolymers are formed. Both lamellar and cylindrical type microdomains in a symmetric polystyrene-block-poly(methyl methacrylate) diblock copolymer and in an asymmetric polystyrene-block-polyisoprene respectively are globally aligned using either benzoic acid (BA) or anthracene (AN) as the crystallizable solvent. The fast directional solidification during the phase separation leads to alignment of the intermaterial dividing surface (IMDS) of both types of microdomains parallel to the fast growth direction of BA and AN crystals (b axis direction in both cases). Depending on film thicknesses, the block copolymers show various microdomain orientations such as vertical lamellae and parallel and perpendicular cylinders to the substrate. With respect to the processing methods currently used to induce orientation in block copolymers, our method allows attainment of ordered patterns over regions larger than 50 μm2 within a few seconds without annealing.

Original languageEnglish
Pages (from-to)2602-2606
Number of pages5
JournalMacromolecules
Volume34
Issue number8
DOIs
Publication statusPublished - 2001 Apr 10

Fingerprint

Crystallization
Block copolymers
Thin films
Benzoic Acid
Benzoic acid
Anthracene
Polystyrenes
Polyisoprenes
Substrates
Polymethyl methacrylates
Phase separation
Melting point
Solidification
Film thickness
Annealing
Crystalline materials
Crystals
Processing

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

@article{682b438d37894753aae864b504e333a6,
title = "Large area orientation of block copolymer microdomains in thin films via directional crystallization of a solvent",
abstract = "A fast method for inducing alignment of microdomains in noncrystalline block copolymers is presented. The method is based on the use of crystalline organic materials, which are solvents for the block copolymers above their melting temperatures, and, when cooled and directionally crystallized, act as a substrate on which thin films of the block copolymers are formed. Both lamellar and cylindrical type microdomains in a symmetric polystyrene-block-poly(methyl methacrylate) diblock copolymer and in an asymmetric polystyrene-block-polyisoprene respectively are globally aligned using either benzoic acid (BA) or anthracene (AN) as the crystallizable solvent. The fast directional solidification during the phase separation leads to alignment of the intermaterial dividing surface (IMDS) of both types of microdomains parallel to the fast growth direction of BA and AN crystals (b axis direction in both cases). Depending on film thicknesses, the block copolymers show various microdomain orientations such as vertical lamellae and parallel and perpendicular cylinders to the substrate. With respect to the processing methods currently used to induce orientation in block copolymers, our method allows attainment of ordered patterns over regions larger than 50 μm2 within a few seconds without annealing.",
author = "Cheolmin Park and {De Rosa}, Claudio and Thomas, {Edwin L.}",
year = "2001",
month = "4",
day = "10",
doi = "10.1021/ma0018603",
language = "English",
volume = "34",
pages = "2602--2606",
journal = "Macromolecules",
issn = "0024-9297",
publisher = "American Chemical Society",
number = "8",

}

Large area orientation of block copolymer microdomains in thin films via directional crystallization of a solvent. / Park, Cheolmin; De Rosa, Claudio; Thomas, Edwin L.

In: Macromolecules, Vol. 34, No. 8, 10.04.2001, p. 2602-2606.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Large area orientation of block copolymer microdomains in thin films via directional crystallization of a solvent

AU - Park, Cheolmin

AU - De Rosa, Claudio

AU - Thomas, Edwin L.

PY - 2001/4/10

Y1 - 2001/4/10

N2 - A fast method for inducing alignment of microdomains in noncrystalline block copolymers is presented. The method is based on the use of crystalline organic materials, which are solvents for the block copolymers above their melting temperatures, and, when cooled and directionally crystallized, act as a substrate on which thin films of the block copolymers are formed. Both lamellar and cylindrical type microdomains in a symmetric polystyrene-block-poly(methyl methacrylate) diblock copolymer and in an asymmetric polystyrene-block-polyisoprene respectively are globally aligned using either benzoic acid (BA) or anthracene (AN) as the crystallizable solvent. The fast directional solidification during the phase separation leads to alignment of the intermaterial dividing surface (IMDS) of both types of microdomains parallel to the fast growth direction of BA and AN crystals (b axis direction in both cases). Depending on film thicknesses, the block copolymers show various microdomain orientations such as vertical lamellae and parallel and perpendicular cylinders to the substrate. With respect to the processing methods currently used to induce orientation in block copolymers, our method allows attainment of ordered patterns over regions larger than 50 μm2 within a few seconds without annealing.

AB - A fast method for inducing alignment of microdomains in noncrystalline block copolymers is presented. The method is based on the use of crystalline organic materials, which are solvents for the block copolymers above their melting temperatures, and, when cooled and directionally crystallized, act as a substrate on which thin films of the block copolymers are formed. Both lamellar and cylindrical type microdomains in a symmetric polystyrene-block-poly(methyl methacrylate) diblock copolymer and in an asymmetric polystyrene-block-polyisoprene respectively are globally aligned using either benzoic acid (BA) or anthracene (AN) as the crystallizable solvent. The fast directional solidification during the phase separation leads to alignment of the intermaterial dividing surface (IMDS) of both types of microdomains parallel to the fast growth direction of BA and AN crystals (b axis direction in both cases). Depending on film thicknesses, the block copolymers show various microdomain orientations such as vertical lamellae and parallel and perpendicular cylinders to the substrate. With respect to the processing methods currently used to induce orientation in block copolymers, our method allows attainment of ordered patterns over regions larger than 50 μm2 within a few seconds without annealing.

UR - http://www.scopus.com/inward/record.url?scp=0035836843&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035836843&partnerID=8YFLogxK

U2 - 10.1021/ma0018603

DO - 10.1021/ma0018603

M3 - Article

AN - SCOPUS:0035836843

VL - 34

SP - 2602

EP - 2606

JO - Macromolecules

JF - Macromolecules

SN - 0024-9297

IS - 8

ER -