【摘要】 采用英国Rosand公司RH7-2X型毛细管流变仪对自制的MTA合成PET样品的流变性能进行了研究。结果表明:同常规PET相比,MTA合成的PET样品的熔体同属于假塑型非牛顿流体;MTA合成的PET样品的非牛顿指数n值较高,而且随着温度的提高,其n值增长趋势更加明显;在低剪切速率条件下,MTA合成PET样品的黏流活化能ΔEη较高,熔体剪切黏度对温度比较敏感,在高剪切速率(20000s-1左右)条件下,两者ΔEη的差距逐渐减小。更多还原

【Abstract】 The rheological behavior of PET synthesized with MTA was studied with Rosand capillary rheometer.The results showed that: melt of PET synthesized with MTA is non-Newtonian pseudoplastic fluid.Non-Newtonian index of PET synthesized with MTA is higher than that of normal PET.With the rising of temperature,the rising trend of non-Newtonian index is more obvious than normal PET.The viscous flow activation energy of PET synthesized with MTA is higher than that of normalized PET in low shear rate,which means that the melt shear viscosity is more sensitive to that of normal PET.But in high shear rate (about 20 000 s^-1),the difference is very small.更多还原