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Behaviour of the miscibility of poly(ethylene oxide)/liquid crystal blends
Author(s) -
Rodrigues José R. S.,
Kaito Akira,
Soldi Valdir,
Pires Alfredo T. N.
Publication year - 1998
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(199806)46:2<138::aid-pi977>3.0.co;2-2
Subject(s) - miscibility , ethylene oxide , materials science , liquid crystal , crystallinity , melting point depression , oxide , chemical engineering , scanning electron microscope , phase (matter) , polymer chemistry , poly ethylene , polarized light microscopy , analytical chemistry (journal) , ethylene , polymer , melting temperature , composite material , organic chemistry , copolymer , chemistry , optics , physics , catalysis , optoelectronics , engineering , metallurgy
The microscopic behaviour of blends of poly(ethylene oxide) with two different 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 ( T m ) depression of PEO increased with 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 affected by the presence of liquid crystals. © 1998 SCI.