Abstract
The liquid-crystalline polyester (designated P R ), synthesized from hydroquinone diacetate, terephthalic acid and 6-acetoxy-2-naphthoic acid (1:1:2) by melt-phase transesterification, may be considerably modified in properties by the replacement of one or more of the monomers by a ‘disrupting’ unit. The disruption may be angular, as for example when isophthalic acid replaces terephthalic acid, or 2,7-diacetoxynaphthalene replaces hydroquinone diacetate, or it may be lateral, as when 1,5-diacetoxynaphthalene is used. The effects of these disrupting units on the thermal behaviour of the polymers, especially liquid crystallinity, and on their propensity to form fibres, are discussed. Although liquid crystallinity may be observed when the polymers are formed from up to 50% of angular units, the fibre formation is significantly diminished whenever the acetoxynaphthoic acid is replaced by p-acetoxybenzoic acid.
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