A comparative study of Theological behavior of PET and PET/carbon black composite masterbatch

摘要

In order to explore the process of masterbatch dilution technique, the performance differences between poly(ethylene terephthalate) (PET) and PET/carbon black (CB) masterbatch were investigated. Scanning electron microscopy images of PET/CB masterbatch display a homogeneous dispersion status of CB particles in PET matrix. Besides, the improvement in heat resistance of masterbatch was confirmed by thermogravimetric analysis. The rheological measurement demonstrates that compared with PET the shear thinning effect of PET/CB masterbatch is more remarkable. The non-Newtonian index (n), activation energy of viscous flow (ΔE) and structural viscosity index (Δη) can provide much important information for understanding the blending mechanism between PET and the master-batch, which is valuable for spinning composite fiber with masterbatch dilution technique. According to the results of rheological measurement, the temperature is optimized to 280 °C and simultaneously the shear rate should be exceed to 1,150 s~(-1) on the basis of the theory of similarity and intermiscibility.