Abstract
Appending a short flexible side-chain to a semiflexible poly(ester ether) results in substantial changes to the phase behaviour; in particular, where comparisons are possible, there is a considerable reduction in the phase transition temperature for the side-chain-bearing system compared to the unsubstituted polymer. A further difference was seen in the tendency for liquid crystal phase formation; side-chain containing systems exhibit liquid crystalline behaviour over a relatively broad temperature range. This may be, at least in part, related to the differing tendencies of the two systems towards crystallization. A non-side-chain substituted polymer is, albeit partly, crystalline at room temperature; in contrast, the side-chain substituted polymer is mainly amorphous. On varying the side-chain concentration in the copolymer, a systematic change in phase behaviour is revealed. The effect of copolymerization on the phase transition temperature is discussed and a comparison with similar copolymers without side-chains reveals the importance of geometric over statistical constraints on the formation of the solid phase.
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