Abstract
The polymer pair poly(epichlorohydrin) (PECH) and poly(ethylene oxide) (PEO) is shown to form completely miscible blends based on the observation of a single glass transition temperature ( T g) by differential scanning calorimetry and lower critical solution temperature ( LCST) behaviour. Since poly(methyl methacrylate) (PMMA) is known from earlier work to form miscible binary blends with PECH and with PEO, then a ternary system (PMMA-PECH-PEO) has been identified for which all three binary pairs are miscible. Examination of ternary blends for T g and LCST behaviour revealed that complete miscibility exists over the entire ternary composition diagram. Heats of mixing for binary mixtures of liquids whose molecular structures are analogues of the polymers are reported in order to understand better the nature of the interactions operative in each of the binary blends. It is seen that oligomeric analogues for poly(ethylene oxide) give misleading results when they have hydroxyl end groups.
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