Poly(trimethylene terephthalate)(PTT) was recently introduced, as a member of commercial aromatic polyester polymer, by Shell Chemicals, under the trade name of Corterra. PTT has properties between those of Poly(ethylene terephthalate) (PET) and Poly(butylenes terephthalate)(PBT). It possesses outstanding properties of PET and processing characteristics of PBT. These characteristics make PTT suitable for uses in Fiber, Film and engineering thermoplastic application.

The current work mainly deals with the formulation and processing of binary PTT-Polyolefins blends for studying the mechanical behavior. The polyolefins chosen are Polypropylene(PP) and Linear Low Density Polyethylene(LLDPE). The main aim in selecting PP & LLDPE is to see the effect of blending on the Ultimate Tensile Strength (UTS) Izod(notch) Strength of PTT.

5,10,15,20,25 & 50% compositions of PP & LLDPE in PTT were prepared by using Single Screw Extruder and the specimens for mechanical testing were prepared by using Injection molding machine. The specimens were prepared as per ASTM standard D638-91 and analysed by Instron 4467 with a 30KN load cell.

It was found that there is a significant improvement in the UTS value of blends having lower concentration of PP & LLDPE in PTT. The UTS values with 5% PP/LLDPE in PTT found to be increased by almost 50% than that of the UTS value of pure PTT. This improvement can be attributed to the partial miscibility of PP/LLDPE in PTT with lower concentration. But as the concentration of PP/LLDPE in PTT increased, the UTS values were dropped as a result of possible phase separation occurring in immiscible blends. Similar behavior is observed in case of Izod (notch) Impact testing, where impact strength found to be increased with lower concentration of PP/LLDPE and later reduced with increasing the concentration of PP/LLDPE.