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Behaviour of the miscibility of poly(ethylene oxide)/liquid crystal blends

✍ Scribed by Rodrigues, José R. S.; Kaito, Akira; Soldi, Valdir; Pires, Alfredo T. N.

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
467 KB
Volume
46
Category
Article
ISSN
0959-8103

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✦ Synopsis

The microscopic behaviour of blends of poly(ethylene oxide) with two di †erent low molecular weight liquid crystals (LC) was studied in order to evaluate miscibility. One of the liquid crystal components had a phase transition temperature lower than the melting temperature of poly(ethylene oxide) (PEO), and the other a higher value. The low molecular weight liquid crystal components were 4-cyano-4@-n-heptylbiphenyl (7CB) and p-cyanophenyl p-pentyloxybenzoate (pCP). Thermal analysis and polarized optical and scanning electron microscopy were employed. The melting temperature depression of PEO increased with (T m ) LC content in the blend, suggesting that the PEO was miscible with both liquid crystals in the isotropic phase. The spherulitic structural morphology of the semicrystalline components is a †ected by the presence of liquid crystals.

1998 SCI.

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