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利用毛细管流变仪研究了聚对苯二甲酸乙二酯(PET)-聚对苯二甲酸丙二酯(PTT)共聚酯(简称PETT)熔体的剪切流动性能,且与对应纯组分的流变性能进行了比较。结果表明:PETT熔体属于非牛顿流体,在相同温度下,PETT的剪切速率和黏度均小于纯PTT的值,且均随PTT链段含量的增加而减小。PETT的非牛顿指数和结构黏度指数均小于纯PTT。在相同剪切速率下,PETT的黏流活化能介于纯PET和纯PTT之间,且随PTT链段含量的增加而减小。
The shear flow properties of polyethylene terephthalate (PET) -poly (trimethylene terephthalate) (PETT) melt were investigated by capillary rheometer and compared with the corresponding pure group The rheological properties of points were compared. The results show that PETT melt belongs to non-Newtonian fluid. At the same temperature, the shear rate and viscosity of PETT are smaller than that of pure PTT, and both decrease with the increase of PTT segment. PETT non-Newtonian index and structural viscosity index were less than pure PTT. Under the same shear rate, the activation energy of PETT is between pure PET and pure PTT, and decreases with the increase of PTT segment content.