The effect of concentration and molecular weight of polycarbonate on the elastic constants of a nematic liquid crystal solvent

We utilized the Light Scattering from Anisotropy of Turbidity (LSAT) method and determined the three Frank's elastic constants of; "splay" (K 1 ), "twist" (K 2 ) and "bend" (K 3 ), in dilute solutions of polycarbonate (PC) in 4-pentyl-4'-cyanobiphenyl (5CB) ne...

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Bibliographic Details
Published in:Molecular Crystals and Liquid Crystals 2018-05, Vol.667 (1), p.36-43
Main Author: Hakemi, H.
Format: Article
Language:English
Subjects:
Anisotropy
anisotropy of turbidity
Crystals
Elastic anisotropy
elastic constants
Elastic limit
Elastic properties
Light scattering
Liquid crystals
Molecular conformation
Molecular weight
Nematic
Nematic crystals
polycarbonate
Polycarbonate resins
polystyrene
Solvents
Turbidity
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Summary:We utilized the Light Scattering from Anisotropy of Turbidity (LSAT) method and determined the three Frank's elastic constants of; "splay" (K 1 ), "twist" (K 2 ) and "bend" (K 3 ), in dilute solutions of polycarbonate (PC) in 4-pentyl-4'-cyanobiphenyl (5CB) nematic liquid crystal solvent. Within the limited solubility range of PC/5CB solutions, we determined the elastic constants of 5CB as a function of the concentration and molecular weight of PC. The results showed that K 2 increases , K 1 and K 3 decrease , whereas K 1 /K 3 and  ratio remain almost invariant by increasing the PC concentration and molecular weight. In contrast to the theoretical models and experimental data, the values and trends of K 1, K 2 and K 3 moduli indicate that, increase of K 2 at the expense of K 1 and K 3 moduli is due to extended chain conformation PC polymer structure and enhancment of lateral interactions between PC and 5CB moieties.
ISSN:1542-1406
1563-5287
1527-1943
DOI:10.1080/15421406.2018.1551181