Abstract
Rheological properties of two poly(ester imide)s with a similar chemical structure are studied in this paper. Both polymers contain the same mesogenic unit and flexible spacer: the only difference is the orientation of the connecting ester groups. The liquid crystalline nature of one of the poly(ester imide)s in the range 170–235°C gives rise to typical peculiar rheological features of nematic polymer such as two shear-thinning regions in the viscosity curves, ∂η/ ∂T>0 when isotropization takes place and orientation during the injection process.
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