Rheology, Mechanical Properties and Non-Isothermal Crystallization Kinetics of Poly(trimethylene terephthalate)/Thermoplastic Polyester Elastomer Blends

摘要

In order to toughen poly(trimethylene terephthalate) (PTT) material, thermoplastic polyester elastomer (TPEE) was blended with PTT for preparing polymer blends and their rheology behaviors, phase morphology, impact strength dependence on molding temperatures, melting and non-isothermal crystallization kinetics were investigated by capillary rheometer, impact tester, scanning electron microscopy, wide , angle X-ray diffraction and differential scanning calorimetry, respectively. The results suggest that the blends’ apparent viscosities and the pseudoplasticity increase with increasing TPEE contents and TPEE has a good effect on improving the blends' melt viscosity. Thermoplastic I polyester elastomer, which is partially miscible with PTT, also has a good toughening effect on PTT for the toughness increases with increasing TPEE content. However, the toughness decreases with molding temperatures increasing from 25 to 75 ℃. The blends crystallize at lower rate and lower dimension than those of PTT. With increasing flexible TPEE, the blends show less crystallization ability for their mote positive crystallization effective activation energy.