Blends of some non-flexible and flexible polymers: Routes to molecular composites?

J. M G Cowie, Shoichi Nakata, Gordon W. Adams

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


The definition of a molecular composite is a blend of a rigid rod polymer and a flexible coil polymer that is miscible at the molecular level. This concept has been tested using systems in which the chain flexibilities differ as widely as possible as judged by the difference in glass transition temperatures (?Tg). The biggest variation (?T ~360°C) was obtained by mixing poly benzimidazole with copolymers of poly(vinyl acetate-ran-vinyl alcohol). It was observed that the blends were distinctly two phase when the hydroxyl content was less than 50 mol %. Above this value clear blends were obtained with finely dispersed phases although it is doubtful if mixing at the molecular level takes place. Miscible blends could be obtained from combinations of the sodium salt of poly(phenylene terephthalamide) with poly(4-vinylpyridine) and mixtures of poly(phenyl imino-1,4-phenyleneoxyterephthalate) with poly(styrene-stathydroxylstyrene) where coulombic interactions and hydrogen bonding respectively promoted the miscibility.

Original languageEnglish
Pages (from-to)207-216
Number of pages10
JournalMacromolecular Symposia
Publication statusPublished - Dec 1996


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