Abstract
The polyester [OPhCO(OCH 2 CH 2 ) 3 OCOPhOCOPhO(CH 2 ) 10 OPhCO] n is studied. The demixing and thermal evolutions of the macroscopically segregated nematic and isotropic components were monitored upon annealing at different temperatures inside the biphasic gap. The equilibrium distribution of the various molecular species at the nematic-isotropic transition and the thermodynamic biphase range were determined. The observed phase segregation is attributed to chain length heterogeneity of the sample, with the longer chain macromolecules tending to selectively segregate into the nematic phase
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