Towards supramolecular side-chain liquid-crystal polymers. Part 3. - Miscibility of mesogenic acids and amorphous polymers

Katherine I. Alder, David Stewart, Corrie T. Imrie*

*Corresponding author for this work

Research output: Contribution to journalReview article

24 Citations (Scopus)

Abstract

The thermal behaviour of blends of 4-n-octyloxybenzoic acid with polystyrene, poly(4-vinyl pyridine) and poly(2-vinyl pyridine) has been characterised using differential scanning calorimetry and polarised light microscopy. The acid is essentially immiscible with polystyrene over the whole composition range. However, molecular mixing is observed for blends containing up to an acid mole fraction of ca. 0.3 with either poly(4-vinyl pyridine) or poly(2-vinyl pyridine). This miscibility is driven by hydrogen-bond formation between the acid and pyridine groups. At higher concentrations of the acid, phase separation occurs although the presence of hydrogen bonding is evident in the IR spectra. No pronounced differences are observed between the blends containing the differing isomers of poly(vinyl pyridine). A model is proposed which interprets these data in terms of two competing processes: the self-association of the acid-forming dimers and the specific interaction between the acid and pyridine groups, yielding hydrogen-bonded complexes.

Original languageEnglish
Pages (from-to)2225-2228
Number of pages4
JournalJournal of Materials Chemistry
Volume5
Issue number12
DOIs
Publication statusPublished - 1 Jan 1995

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