Evolution of microstructure in the liquid and crystal directions in a quenched block copolymer melt

N. P. Balsara, Bruce Garetz, M. C. Newstein, B. J. Bauer, T. J. Prosa

Research output: Contribution to journalArticle

Abstract

The kinetics of the disorder-to-order transition in a polystyrene-block-polyisoprene copolymer was studied after it was thermally quenched from the disordered state to the ordered state. The ordered state consists of cylinders arranged on a hexagonal lattice. This state has liquid crystalline symmetry with liquidlike disorder along the cylinders axis and crystalline order in the hexagonal plane. We monitor the kinetics of microstructure formation in the liquid and crystalline directions by a combination of time-resolved depolarized light scattering and small-angle X-ray scattering experiments. At small quench depths microstructure formation along the liquid and crystalline directions is strongly correlated during all stages of the disorder-to-order transition. We demonstrate that this is expected when microstructure formation occurs by classical nucleation and growth. At large quench depths, however, microstructure formation along the liquid and crystalline directions is not correlated. The growth of crystalline order occurs before the development of a coherent structure along the liquid direction. We argue that this may be a signature of spinodal decomposition in liquid crystals.

Original languageEnglish (US)
Pages (from-to)7668-7675
Number of pages8
JournalMacromolecules
Volume31
Issue number22
StatePublished - Nov 3 1998

Fingerprint

Liquid Crystals
Block copolymers
Crystalline materials
Crystals
Microstructure
Liquids
Spinodal decomposition
Polyisoprenes
Kinetics
Crystal symmetry
X ray scattering
Crystal lattices
Light scattering
Liquid crystals
Direction compound
Polystyrenes
Nucleation
Copolymers

ASJC Scopus subject areas

  • Materials Chemistry

Cite this

Balsara, N. P., Garetz, B., Newstein, M. C., Bauer, B. J., & Prosa, T. J. (1998). Evolution of microstructure in the liquid and crystal directions in a quenched block copolymer melt. Macromolecules, 31(22), 7668-7675.

Evolution of microstructure in the liquid and crystal directions in a quenched block copolymer melt. / Balsara, N. P.; Garetz, Bruce; Newstein, M. C.; Bauer, B. J.; Prosa, T. J.

In: Macromolecules, Vol. 31, No. 22, 03.11.1998, p. 7668-7675.

Research output: Contribution to journalArticle

Balsara, NP, Garetz, B, Newstein, MC, Bauer, BJ & Prosa, TJ 1998, 'Evolution of microstructure in the liquid and crystal directions in a quenched block copolymer melt', Macromolecules, vol. 31, no. 22, pp. 7668-7675.
Balsara, N. P. ; Garetz, Bruce ; Newstein, M. C. ; Bauer, B. J. ; Prosa, T. J. / Evolution of microstructure in the liquid and crystal directions in a quenched block copolymer melt. In: Macromolecules. 1998 ; Vol. 31, No. 22. pp. 7668-7675.
@article{4cd96ad12d6047d6ac3ba2a9cdc37ab0,
title = "Evolution of microstructure in the liquid and crystal directions in a quenched block copolymer melt",
abstract = "The kinetics of the disorder-to-order transition in a polystyrene-block-polyisoprene copolymer was studied after it was thermally quenched from the disordered state to the ordered state. The ordered state consists of cylinders arranged on a hexagonal lattice. This state has liquid crystalline symmetry with liquidlike disorder along the cylinders axis and crystalline order in the hexagonal plane. We monitor the kinetics of microstructure formation in the liquid and crystalline directions by a combination of time-resolved depolarized light scattering and small-angle X-ray scattering experiments. At small quench depths microstructure formation along the liquid and crystalline directions is strongly correlated during all stages of the disorder-to-order transition. We demonstrate that this is expected when microstructure formation occurs by classical nucleation and growth. At large quench depths, however, microstructure formation along the liquid and crystalline directions is not correlated. The growth of crystalline order occurs before the development of a coherent structure along the liquid direction. We argue that this may be a signature of spinodal decomposition in liquid crystals.",
author = "Balsara, {N. P.} and Bruce Garetz and Newstein, {M. C.} and Bauer, {B. J.} and Prosa, {T. J.}",
year = "1998",
month = "11",
day = "3",
language = "English (US)",
volume = "31",
pages = "7668--7675",
journal = "Macromolecules",
issn = "0024-9297",
publisher = "American Chemical Society",
number = "22",

}

TY - JOUR

T1 - Evolution of microstructure in the liquid and crystal directions in a quenched block copolymer melt

AU - Balsara, N. P.

AU - Garetz, Bruce

AU - Newstein, M. C.

AU - Bauer, B. J.

AU - Prosa, T. J.

PY - 1998/11/3

Y1 - 1998/11/3

N2 - The kinetics of the disorder-to-order transition in a polystyrene-block-polyisoprene copolymer was studied after it was thermally quenched from the disordered state to the ordered state. The ordered state consists of cylinders arranged on a hexagonal lattice. This state has liquid crystalline symmetry with liquidlike disorder along the cylinders axis and crystalline order in the hexagonal plane. We monitor the kinetics of microstructure formation in the liquid and crystalline directions by a combination of time-resolved depolarized light scattering and small-angle X-ray scattering experiments. At small quench depths microstructure formation along the liquid and crystalline directions is strongly correlated during all stages of the disorder-to-order transition. We demonstrate that this is expected when microstructure formation occurs by classical nucleation and growth. At large quench depths, however, microstructure formation along the liquid and crystalline directions is not correlated. The growth of crystalline order occurs before the development of a coherent structure along the liquid direction. We argue that this may be a signature of spinodal decomposition in liquid crystals.

AB - The kinetics of the disorder-to-order transition in a polystyrene-block-polyisoprene copolymer was studied after it was thermally quenched from the disordered state to the ordered state. The ordered state consists of cylinders arranged on a hexagonal lattice. This state has liquid crystalline symmetry with liquidlike disorder along the cylinders axis and crystalline order in the hexagonal plane. We monitor the kinetics of microstructure formation in the liquid and crystalline directions by a combination of time-resolved depolarized light scattering and small-angle X-ray scattering experiments. At small quench depths microstructure formation along the liquid and crystalline directions is strongly correlated during all stages of the disorder-to-order transition. We demonstrate that this is expected when microstructure formation occurs by classical nucleation and growth. At large quench depths, however, microstructure formation along the liquid and crystalline directions is not correlated. The growth of crystalline order occurs before the development of a coherent structure along the liquid direction. We argue that this may be a signature of spinodal decomposition in liquid crystals.

UR - http://www.scopus.com/inward/record.url?scp=0032480684&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0032480684&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0032480684

VL - 31

SP - 7668

EP - 7675

JO - Macromolecules

JF - Macromolecules

SN - 0024-9297

IS - 22

ER -