Supramolecular side chain liquid crystal polymers II. Interaction of mesogenic acids and amorphous polymers

David Stewart, Corrie T. Imrie

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

The thermal behaviour of blends of a low molar mass mesogenic acid, 6-(4-n-butyloxy- 4'-oxybiphenyl)hexanoic acid (BOBPOHA) with polystyrene, poly(2-vinylpyridine) and poly(4-vinylpyridine) has been characterized. BOBPOHA exhibits a monotropic smectic A phase and is essentially immiscible with polystyrene. Thus, the transition temperatures of the acid are independent of blend composition. In contrast, the thermal properties of the acid are strongly modified on blending with poly(2-vinylpyridine) and poly(4-vinylpyridine). Molecular mixing occurs in these blends below approximately 0-2 mol fraction of acid. This miscibility is driven by the formation of hydrogen bonds between the pyridyl and acid moieties. At higher concentrations of acid, phase separation occurs. Liquid crystallinity is not observed in the miscible blends while in the immiscible blends mesomorphic behaviour is attributed to regions of phase separated acid.

Original languageEnglish
Pages (from-to)619-625
Number of pages7
JournalLiquid Crystals
Volume20
Issue number5
DOIs
Publication statusPublished - 1996

Fingerprint

Liquid crystal polymers
Polymers
liquid crystals
acids
Acids
polymers
interactions
Polystyrenes
polystyrene
Molar mass
liquid crystal polymer
Phase separation
Hydrogen bonds
Superconducting transition temperature
Thermodynamic properties
Solubility
crystallinity
solubility
thermodynamic properties
transition temperature

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Supramolecular side chain liquid crystal polymers II. Interaction of mesogenic acids and amorphous polymers. / Stewart, David; Imrie, Corrie T.

In: Liquid Crystals, Vol. 20, No. 5, 1996, p. 619-625.

Research output: Contribution to journalArticle

@article{10b7a3321f8e4f1eb245ceace1c19d56,
title = "Supramolecular side chain liquid crystal polymers II. Interaction of mesogenic acids and amorphous polymers",
abstract = "The thermal behaviour of blends of a low molar mass mesogenic acid, 6-(4-n-butyloxy- 4'-oxybiphenyl)hexanoic acid (BOBPOHA) with polystyrene, poly(2-vinylpyridine) and poly(4-vinylpyridine) has been characterized. BOBPOHA exhibits a monotropic smectic A phase and is essentially immiscible with polystyrene. Thus, the transition temperatures of the acid are independent of blend composition. In contrast, the thermal properties of the acid are strongly modified on blending with poly(2-vinylpyridine) and poly(4-vinylpyridine). Molecular mixing occurs in these blends below approximately 0-2 mol fraction of acid. This miscibility is driven by the formation of hydrogen bonds between the pyridyl and acid moieties. At higher concentrations of acid, phase separation occurs. Liquid crystallinity is not observed in the miscible blends while in the immiscible blends mesomorphic behaviour is attributed to regions of phase separated acid.",
author = "David Stewart and Imrie, {Corrie T.}",
year = "1996",
doi = "10.1080/02678299608031151",
language = "English",
volume = "20",
pages = "619--625",
journal = "Liquid Crystals",
issn = "0267-8292",
publisher = "TAYLOR & FRANCIS LTD",
number = "5",

}

TY - JOUR

T1 - Supramolecular side chain liquid crystal polymers II. Interaction of mesogenic acids and amorphous polymers

AU - Stewart, David

AU - Imrie, Corrie T.

PY - 1996

Y1 - 1996

N2 - The thermal behaviour of blends of a low molar mass mesogenic acid, 6-(4-n-butyloxy- 4'-oxybiphenyl)hexanoic acid (BOBPOHA) with polystyrene, poly(2-vinylpyridine) and poly(4-vinylpyridine) has been characterized. BOBPOHA exhibits a monotropic smectic A phase and is essentially immiscible with polystyrene. Thus, the transition temperatures of the acid are independent of blend composition. In contrast, the thermal properties of the acid are strongly modified on blending with poly(2-vinylpyridine) and poly(4-vinylpyridine). Molecular mixing occurs in these blends below approximately 0-2 mol fraction of acid. This miscibility is driven by the formation of hydrogen bonds between the pyridyl and acid moieties. At higher concentrations of acid, phase separation occurs. Liquid crystallinity is not observed in the miscible blends while in the immiscible blends mesomorphic behaviour is attributed to regions of phase separated acid.

AB - The thermal behaviour of blends of a low molar mass mesogenic acid, 6-(4-n-butyloxy- 4'-oxybiphenyl)hexanoic acid (BOBPOHA) with polystyrene, poly(2-vinylpyridine) and poly(4-vinylpyridine) has been characterized. BOBPOHA exhibits a monotropic smectic A phase and is essentially immiscible with polystyrene. Thus, the transition temperatures of the acid are independent of blend composition. In contrast, the thermal properties of the acid are strongly modified on blending with poly(2-vinylpyridine) and poly(4-vinylpyridine). Molecular mixing occurs in these blends below approximately 0-2 mol fraction of acid. This miscibility is driven by the formation of hydrogen bonds between the pyridyl and acid moieties. At higher concentrations of acid, phase separation occurs. Liquid crystallinity is not observed in the miscible blends while in the immiscible blends mesomorphic behaviour is attributed to regions of phase separated acid.

UR - http://www.scopus.com/inward/record.url?scp=2542537020&partnerID=8YFLogxK

U2 - 10.1080/02678299608031151

DO - 10.1080/02678299608031151

M3 - Article

AN - SCOPUS:2542537020

VL - 20

SP - 619

EP - 625

JO - Liquid Crystals

JF - Liquid Crystals

SN - 0267-8292

IS - 5

ER -