Citation: WANG Yong, WU Dacheng, LI Ruixia. RHEOLOGICAL PROPERTIES OF LIQUID CRYSTALLINE COPOLY (ρ-HYDR0XYBENZ0ATE/BISPHENOL A TEREPHTHALATE)[J]. Chinese Journal of Polymer Science, ;1996, 14(2): 97-104. shu

RHEOLOGICAL PROPERTIES OF LIQUID CRYSTALLINE COPOLY (ρ-HYDR0XYBENZ0ATE/BISPHENOL A TEREPHTHALATE)

Received Date: 20 June 1994

Various aspects of the rheological behaviour of liquid crystalline copolyesters, i.e.,samples of copoly (p-hydroxybenzoate / bisphenol A terephthalate), were explored by usingInstron capillary rheometer. The experimental results indicated that the apparent viscositywas affected significantly by shear rate, melt temperature and p-hydroxybenzoate unit con-tent. The flow activation energies △Eη are in the range of 205.1 to 74.5 kJ/mol, dependingon the shear rate of 10-1000 s-1, at temperature 568-603K. These copolyesters exhibit a yield phenomenon in the shear flow,and the values of yield stress decrease with increasing temperature.It is quite unusual that the extrudate of the copolyester shows the smaller swelling ratio even than unity at the lower temperature and lower shear rates.
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