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 language | English |
|---|---|
| Pages (from-to) | 619-625 |
| Number of pages | 7 |
| Journal | Liquid Crystals |
| Volume | 20 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 1996 |
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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 journal › Article
}
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 -