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- W2074319794 abstract "A series of copolyesters was prepared by the melt reaction of a mixture of n-octylhydroquinone and resorcinol in varying ratios with 1,4-bis(4-chloroformylphenoxy)butane. Resorcinol was used as a comonomer to study the effect of a nonmesogenic structural unit on the thermotropic properties of a main chain liquid crystalline polyester with a flexible spacer. The effect of a tetramethylene spacer was compared with that of a longer, decamethylene spacer, which was included in similar copolyesters reported earlier by us. The inclusion of resorcinol units in increasing amounts destroyed the ability of the copolyesters to crystallize, as expected, and the copolymer containing as low as 20 mol % resorcinol showed no melting transition on analysis by differential thermal analysis (DSC). In contrast, the ability to form a liquid crystalline phase persisted until at least 40 mol % resorcinol was present. As expected, the isotropization temperature and the enthalpy and entropy changes for isotropization decreased with increasing non-mesogenic comonomer content." @default.
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- W2074319794 date "1990-08-01" @default.
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- W2074319794 title "Liquid crystalline properties of the copolyesters prepared from n-octylhydroquinone, resorcinol, and 1,4-bis(4-carboxyphenoxy) butane" @default.
- W2074319794 doi "https://doi.org/10.1002/pola.1990.080280904" @default.
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