Effect of a fluorine lateral moiety on the liquid crystallinity of wholly aromatic polyester-amides

Si Xue Cheng; Tai Shung Chung

doi:10.1016/S0032-3861(02)00679-1

Effect of a fluorine lateral moiety on the liquid crystallinity of wholly aromatic polyester-amides

Si Xue Cheng, Tai Shung Chung^*

^*Corresponding author for this work

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

6 Scopus citations

Abstract

We have identified the effect of a fluorine lateral moiety on the liquid crystallinity of wholly aromatic polyester-amides, The evolution of liquid crystal texture for two reaction systems, p-acetoxybenzoic acid (ABA)/acetoxy acetanilide (AAA)/3-fluorophthalic acid (FPA) and ABA/AAA/phthalic acid (PA), were examined and compared by in situ polymerizations under a polarizing microscope with a heating-stage. The fluorine lateral moiety was found to have an adverse effect on the liquid crystallinity. The system containing FPA needs higher critical ABA content (the rigid and straight monomer) to form liquid crystallinity than the system containing PA. In addition, the LC phase emerges faster in the ABA/AAA/PA system than in the ABA/AAA/FPA system during polymerizations. Amorphous phase reappears in the later stage of thin film polymerizations for both systems if ABA content is in a particular range. However, the ABA/AAA/FPA system has a greater amorphous area than the ABA/AAA/PA system.

Original language	English (US)
Pages (from-to)	7433-7441
Number of pages	9
Journal	Polymer
Volume	43
Issue number	26
DOIs	https://doi.org/10.1016/S0032-3861(02)00679-1
State	Published - Nov 21 2002
Externally published	Yes

Keywords

Fluorine
Liquid crystalline polymer
Liquid crystallinity

ASJC Scopus subject areas

Materials Chemistry
Polymers and Plastics
Organic Chemistry

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10.1016/S0032-3861(02)00679-1

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title = "Effect of a fluorine lateral moiety on the liquid crystallinity of wholly aromatic polyester-amides",

abstract = "We have identified the effect of a fluorine lateral moiety on the liquid crystallinity of wholly aromatic polyester-amides, The evolution of liquid crystal texture for two reaction systems, p-acetoxybenzoic acid (ABA)/acetoxy acetanilide (AAA)/3-fluorophthalic acid (FPA) and ABA/AAA/phthalic acid (PA), were examined and compared by in situ polymerizations under a polarizing microscope with a heating-stage. The fluorine lateral moiety was found to have an adverse effect on the liquid crystallinity. The system containing FPA needs higher critical ABA content (the rigid and straight monomer) to form liquid crystallinity than the system containing PA. In addition, the LC phase emerges faster in the ABA/AAA/PA system than in the ABA/AAA/FPA system during polymerizations. Amorphous phase reappears in the later stage of thin film polymerizations for both systems if ABA content is in a particular range. However, the ABA/AAA/FPA system has a greater amorphous area than the ABA/AAA/PA system.",

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author = "Cheng, {Si Xue} and Chung, {Tai Shung}",

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T1 - Effect of a fluorine lateral moiety on the liquid crystallinity of wholly aromatic polyester-amides

AU - Cheng, Si Xue

AU - Chung, Tai Shung

PY - 2002/11/21

Y1 - 2002/11/21

N2 - We have identified the effect of a fluorine lateral moiety on the liquid crystallinity of wholly aromatic polyester-amides, The evolution of liquid crystal texture for two reaction systems, p-acetoxybenzoic acid (ABA)/acetoxy acetanilide (AAA)/3-fluorophthalic acid (FPA) and ABA/AAA/phthalic acid (PA), were examined and compared by in situ polymerizations under a polarizing microscope with a heating-stage. The fluorine lateral moiety was found to have an adverse effect on the liquid crystallinity. The system containing FPA needs higher critical ABA content (the rigid and straight monomer) to form liquid crystallinity than the system containing PA. In addition, the LC phase emerges faster in the ABA/AAA/PA system than in the ABA/AAA/FPA system during polymerizations. Amorphous phase reappears in the later stage of thin film polymerizations for both systems if ABA content is in a particular range. However, the ABA/AAA/FPA system has a greater amorphous area than the ABA/AAA/PA system.

AB - We have identified the effect of a fluorine lateral moiety on the liquid crystallinity of wholly aromatic polyester-amides, The evolution of liquid crystal texture for two reaction systems, p-acetoxybenzoic acid (ABA)/acetoxy acetanilide (AAA)/3-fluorophthalic acid (FPA) and ABA/AAA/phthalic acid (PA), were examined and compared by in situ polymerizations under a polarizing microscope with a heating-stage. The fluorine lateral moiety was found to have an adverse effect on the liquid crystallinity. The system containing FPA needs higher critical ABA content (the rigid and straight monomer) to form liquid crystallinity than the system containing PA. In addition, the LC phase emerges faster in the ABA/AAA/PA system than in the ABA/AAA/FPA system during polymerizations. Amorphous phase reappears in the later stage of thin film polymerizations for both systems if ABA content is in a particular range. However, the ABA/AAA/FPA system has a greater amorphous area than the ABA/AAA/PA system.

KW - Fluorine

KW - Liquid crystalline polymer

KW - Liquid crystallinity

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DO - 10.1016/S0032-3861(02)00679-1

M3 - Article

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JO - Polymer

JF - Polymer

IS - 26

ER -

Effect of a fluorine lateral moiety on the liquid crystallinity of wholly aromatic polyester-amides

Abstract

Keywords

ASJC Scopus subject areas

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