聚(2,5-苯并噁唑)的流变性能

Rheological Properties of Poly(2,5-benzoxazole)

用自制的3-氨基-4-羟基苯甲酸盐酸盐(ABBAH)在多聚磷酸(PPA)中合成聚(2,5-苯并噁唑)(ABPBO),利用衰减全反射红外光谱(ATR-IR)表征了其化学结构。分别用平板流变仪和毛细管流变仪对合成的ABPBO-PPA溶液进行动态和稳态流变测试。结果表明:ABPBO-PPA溶液的储能模量(G′)和损耗模量(G″)均随频率升高而增大,且储能模量比损耗模量上升得更快;ABP-BO-PPA溶液随温度升高趋于牛顿流体,随浓度升高非牛顿性更显著,ABPBO-PPA溶液表现出强烈的假塑性,并且不同温度下溶液的剪切黏度差值随剪切应力增大而减小。

Poly（2,5-benzoxazole） （ABPBO） was synthesized from 3-amino-4-hydroxybenzoic acid hydro chloride made by solution polycondensation in the solvent of polyphosphoric acid （PPA）. Chemical struc- ture of the polymer was tested with ATR-IR. Then the dynamic rheological behavior of ABPBO-PPA solu- tion was tested with a parallel-plate rheometer, and the steady flow curve was tested with a capillary rhe- ometer. Results showed that the storage and loss modulus increased as frequency increased, and storage modulus increased more quickly than the loss modulus. ABPBO-PPA solution tended to Newtonian fluid with the temperature rising. However, it tended to non-Newtonian fluid with the increasing of the ABP- BO-PPA concentration. ABPBO-PPA solution behaved sharp pseudoplastic. And the disparity of viscosi- ties with different temperatures decreased with the shear stress increasing.