Nematic-isotropic phase behaviors of polydisperse polymer/liquid-crystal systems: Chain-length-dependent interaction parameter

Jung Jin Choi, Young Chan Bae, Jae Jun Kim

Research output: Contribution to journalArticle

Abstract

Phase behaviors of polydisperse polystyrene (PS)/nematic liquid-crystal systems [P-ethoxy - benzylidene - p - n-butylani-line (EBBA)] are investigated with a thermo-optical analysis technique. We also develop a thermodynamic framework to describe the phase behaviors of polydisperse PS/EBB A systems. The proposed model is based on a modified double-lattice model to describe Isotropic mixing and Maier-Saupe theory for anisotropic ordering. To correlate the polymer chain length and energy parameters in a nematic-isotropic biphasic region and to apply the primary interaction parameter in an isotropic-isotropic phase-transition behaviors of polydisperse PS/EBB A systems. The proposed model shows remarkable agreement with experimental data for the model systems in comparison with an existing model.

Original languageEnglish
Pages (from-to)1031-1039
Number of pages9
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume44
Issue number7
DOIs
StatePublished - 2006 Apr 1

Fingerprint

Liquid crystal polymers
Phase behavior
Chain length
liquid crystals
Polystyrenes
polymers
polystyrene
interactions
Nematic liquid crystals
Polymers
Phase transitions
liquid crystal polymer
Thermodynamics
thermodynamics
energy

Keywords

  • Lattice model
  • Maier-Saupe theory
  • Modified double-lattice model
  • Molar mass distribution
  • Nematic-isotropic transition
  • Phase behaviors
  • Polydisperse polymers
  • Polymer chain length

Cite this

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title = "Nematic-isotropic phase behaviors of polydisperse polymer/liquid-crystal systems: Chain-length-dependent interaction parameter",
abstract = "Phase behaviors of polydisperse polystyrene (PS)/nematic liquid-crystal systems [P-ethoxy - benzylidene - p - n-butylani-line (EBBA)] are investigated with a thermo-optical analysis technique. We also develop a thermodynamic framework to describe the phase behaviors of polydisperse PS/EBB A systems. The proposed model is based on a modified double-lattice model to describe Isotropic mixing and Maier-Saupe theory for anisotropic ordering. To correlate the polymer chain length and energy parameters in a nematic-isotropic biphasic region and to apply the primary interaction parameter in an isotropic-isotropic phase-transition behaviors of polydisperse PS/EBB A systems. The proposed model shows remarkable agreement with experimental data for the model systems in comparison with an existing model.",
keywords = "Lattice model, Maier-Saupe theory, Modified double-lattice model, Molar mass distribution, Nematic-isotropic transition, Phase behaviors, Polydisperse polymers, Polymer chain length",
author = "Choi, {Jung Jin} and Bae, {Young Chan} and Kim, {Jae Jun}",
year = "2006",
month = "4",
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doi = "10.1002/polb.20745",
language = "English",
volume = "44",
pages = "1031--1039",
journal = "Journal of Polymer Science, Part B: Polymer Physics",
issn = "0887-6266",
number = "7",

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T1 - Nematic-isotropic phase behaviors of polydisperse polymer/liquid-crystal systems

T2 - Chain-length-dependent interaction parameter

AU - Choi, Jung Jin

AU - Bae, Young Chan

AU - Kim, Jae Jun

PY - 2006/4/1

Y1 - 2006/4/1

N2 - Phase behaviors of polydisperse polystyrene (PS)/nematic liquid-crystal systems [P-ethoxy - benzylidene - p - n-butylani-line (EBBA)] are investigated with a thermo-optical analysis technique. We also develop a thermodynamic framework to describe the phase behaviors of polydisperse PS/EBB A systems. The proposed model is based on a modified double-lattice model to describe Isotropic mixing and Maier-Saupe theory for anisotropic ordering. To correlate the polymer chain length and energy parameters in a nematic-isotropic biphasic region and to apply the primary interaction parameter in an isotropic-isotropic phase-transition behaviors of polydisperse PS/EBB A systems. The proposed model shows remarkable agreement with experimental data for the model systems in comparison with an existing model.

AB - Phase behaviors of polydisperse polystyrene (PS)/nematic liquid-crystal systems [P-ethoxy - benzylidene - p - n-butylani-line (EBBA)] are investigated with a thermo-optical analysis technique. We also develop a thermodynamic framework to describe the phase behaviors of polydisperse PS/EBB A systems. The proposed model is based on a modified double-lattice model to describe Isotropic mixing and Maier-Saupe theory for anisotropic ordering. To correlate the polymer chain length and energy parameters in a nematic-isotropic biphasic region and to apply the primary interaction parameter in an isotropic-isotropic phase-transition behaviors of polydisperse PS/EBB A systems. The proposed model shows remarkable agreement with experimental data for the model systems in comparison with an existing model.

KW - Lattice model

KW - Maier-Saupe theory

KW - Modified double-lattice model

KW - Molar mass distribution

KW - Nematic-isotropic transition

KW - Phase behaviors

KW - Polydisperse polymers

KW - Polymer chain length

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JO - Journal of Polymer Science, Part B: Polymer Physics

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