Compatibility studies of blends of a thermotropic liquid crystalline polymer and flexible chain polymers by application of Flory's lattice theory

H. S. Lee; H. C. Jung; M. S. Han; C. S. Lee; W. N. Kim

doi:10.1016/S0032-3861(00)00584-X

Compatibility studies of blends of a thermotropic liquid crystalline polymer and flexible chain polymers by application of Flory's lattice theory

H. S. Lee, H. C. Jung, M. S. Han, C. S. Lee, W. N. Kim

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

Flory's lattice theory has been applied to the polymer blends containing a thermotropic liquid crystalline polymer (LCP) and flexible chain polymers. The phase behavior of blends of a thermotropic LCP and a flexible chain polymer at melt processing temperature can be evaluated by two quantitative parameters: the polymer-polymer interaction parameter (χ₁₂) and the degree of disorder (y/x₁). From the results of the model calculation, it has been found that the miscibility is increased with the increase of the degree of disorder (y/x₁) of the LCP and with the decrease of the degree of polymerization (x₁m and/or x₂). The simulated spinodal curve of ternary polymer blends containing a thermotropic LCP and two flexible chain polymers has been calculated using the lattice theory. When three pairs of binary polymer blends are immiscible, the coexistence curve of the three phases appears for the ternary blend having similar values of X_ij among component polymers. When the LCP is immiscible with two flexible chain polymers, and also when the two flexible chain polymers are miscible with each other, the strong effect of anisotropy of the LCP is observed in the simulated spinodal curve. When three pairs of binary polymer blends are miscible, a phase separation is also observed due to the |Δχ| effect.

Original language	English
Pages (from-to)	2177-2184
Number of pages	8
Journal	Polymer
Volume	42
Issue number	5
DOIs	https://doi.org/10.1016/S0032-3861(00)00584-X
Publication status	Published - 2001

Bibliographical note

Funding Information:
This work was supported by the Center for Advanced Functional Polymers under contract number 97K3-1005-03-11-3 through the Korea Science and Engineering Foundation. This work was also supported in part by the Brain Korea 21 (BK 21) program through the Korea Ministry of Education.

Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.

Keywords

Liquid crystalline polymer
Polymer blends
Polymer-polymer interaction parameter

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Materials Chemistry

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10.1016/S0032-3861(00)00584-X

Cite this

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title = "Compatibility studies of blends of a thermotropic liquid crystalline polymer and flexible chain polymers by application of Flory's lattice theory",

abstract = "Flory's lattice theory has been applied to the polymer blends containing a thermotropic liquid crystalline polymer (LCP) and flexible chain polymers. The phase behavior of blends of a thermotropic LCP and a flexible chain polymer at melt processing temperature can be evaluated by two quantitative parameters: the polymer-polymer interaction parameter (χ12) and the degree of disorder (y/x1). From the results of the model calculation, it has been found that the miscibility is increased with the increase of the degree of disorder (y/x1) of the LCP and with the decrease of the degree of polymerization (x1m and/or x2). The simulated spinodal curve of ternary polymer blends containing a thermotropic LCP and two flexible chain polymers has been calculated using the lattice theory. When three pairs of binary polymer blends are immiscible, the coexistence curve of the three phases appears for the ternary blend having similar values of Xij among component polymers. When the LCP is immiscible with two flexible chain polymers, and also when the two flexible chain polymers are miscible with each other, the strong effect of anisotropy of the LCP is observed in the simulated spinodal curve. When three pairs of binary polymer blends are miscible, a phase separation is also observed due to the |Δχ| effect.",

keywords = "Liquid crystalline polymer, Polymer blends, Polymer-polymer interaction parameter",

author = "Lee, {H. S.} and Jung, {H. C.} and Han, {M. S.} and Lee, {C. S.} and Kim, {W. N.}",

note = "Funding Information: This work was supported by the Center for Advanced Functional Polymers under contract number 97K3-1005-03-11-3 through the Korea Science and Engineering Foundation. This work was also supported in part by the Brain Korea 21 (BK 21) program through the Korea Ministry of Education. Copyright: Copyright 2018 Elsevier B.V., All rights reserved.",

year = "2001",

doi = "10.1016/S0032-3861(00)00584-X",

language = "English",

volume = "42",

pages = "2177--2184",

journal = "Polymer",

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AU - Lee, H. S.

AU - Jung, H. C.

AU - Han, M. S.

AU - Lee, C. S.

AU - Kim, W. N.

N1 - Funding Information: This work was supported by the Center for Advanced Functional Polymers under contract number 97K3-1005-03-11-3 through the Korea Science and Engineering Foundation. This work was also supported in part by the Brain Korea 21 (BK 21) program through the Korea Ministry of Education. Copyright: Copyright 2018 Elsevier B.V., All rights reserved.

PY - 2001

Y1 - 2001

N2 - Flory's lattice theory has been applied to the polymer blends containing a thermotropic liquid crystalline polymer (LCP) and flexible chain polymers. The phase behavior of blends of a thermotropic LCP and a flexible chain polymer at melt processing temperature can be evaluated by two quantitative parameters: the polymer-polymer interaction parameter (χ12) and the degree of disorder (y/x1). From the results of the model calculation, it has been found that the miscibility is increased with the increase of the degree of disorder (y/x1) of the LCP and with the decrease of the degree of polymerization (x1m and/or x2). The simulated spinodal curve of ternary polymer blends containing a thermotropic LCP and two flexible chain polymers has been calculated using the lattice theory. When three pairs of binary polymer blends are immiscible, the coexistence curve of the three phases appears for the ternary blend having similar values of Xij among component polymers. When the LCP is immiscible with two flexible chain polymers, and also when the two flexible chain polymers are miscible with each other, the strong effect of anisotropy of the LCP is observed in the simulated spinodal curve. When three pairs of binary polymer blends are miscible, a phase separation is also observed due to the |Δχ| effect.

AB - Flory's lattice theory has been applied to the polymer blends containing a thermotropic liquid crystalline polymer (LCP) and flexible chain polymers. The phase behavior of blends of a thermotropic LCP and a flexible chain polymer at melt processing temperature can be evaluated by two quantitative parameters: the polymer-polymer interaction parameter (χ12) and the degree of disorder (y/x1). From the results of the model calculation, it has been found that the miscibility is increased with the increase of the degree of disorder (y/x1) of the LCP and with the decrease of the degree of polymerization (x1m and/or x2). The simulated spinodal curve of ternary polymer blends containing a thermotropic LCP and two flexible chain polymers has been calculated using the lattice theory. When three pairs of binary polymer blends are immiscible, the coexistence curve of the three phases appears for the ternary blend having similar values of Xij among component polymers. When the LCP is immiscible with two flexible chain polymers, and also when the two flexible chain polymers are miscible with each other, the strong effect of anisotropy of the LCP is observed in the simulated spinodal curve. When three pairs of binary polymer blends are miscible, a phase separation is also observed due to the |Δχ| effect.

KW - Liquid crystalline polymer

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KW - Polymer-polymer interaction parameter

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Compatibility studies of blends of a thermotropic liquid crystalline polymer and flexible chain polymers by application of Flory's lattice theory

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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