writer：5. Xiaojun Chen, Xiaoyun Liu, Jun Qian, Qixin Zhuang, Xinxin Li, Zhewen Han
keywords：poly(p-phenylene benzobisoxazole); shear flow; rheological properties; liquid crystal polymer
source：期刊
specific source：Journal of Applied Polymer Science, 2008, 110: 1899–1904
Issue time：2008年

In this study, the shear flow properties of Poly(p-phenylene benzobisoxazole) (PBO)/poly(phosphoric acid) (PPA) spinning dope were studied by means of capillary rheometer. The effect of shear stress, temperature, PBO
concentration, and PBO molecular weight on the apparent viscosity of PBO/PPA dope was discussed. The results showed that the apparent viscosity of the dope decreased with the increase of the shear stress and the temperature. The
flow behavior index increased with the increase of temperature, which indicated that the non-Newtonian behavior of the dope became weaker at high temperature. Moreover, it was also found that at high shear stress, the apparent viscosity
of the dope was insensitive to the temperature, PBO molecular weight, and PBO concentration.