Effects of Polyester Thermoplastic Polyurethane Elastomer on Toughening Modification of Polyvinyl Chloride

The polyester type thermoplastic polyurethane elastomer (TPU) was successfully designed and synthesized with diphenyl methane diisocyanate (MDI) and poly-caprolaclone glycol (PCL) and 1, 4-butanediol (1, 4-BDO) as raw material. Synthesis condition is MDI isocyanate index of 0.98; tpolymerization temperature of 60~70℃, the reaction time of 1 h. By elemental analysis, FT-IR, NMR, DSC, gel chromatography, the hard segment content and chemical structure of the TPU were determined. Through blending with PVC, toughening effects of synthetic TPU on PVC were evaluated. The structure and properties of PVC/TPU blends were characterized by the mechanics performance test, differential scanning calorimetry (DSC) and scanning electron microscope (SEM). Results show that the blends haves good compatibility between TPU and PVC and good toughening effect on PVC. With the TPU mass fraction of 15% in PVC/TPU blends, the mechanical performance is better than that of commercially available TPU materials. With rising of hard segment rate of the synthesized TPU, the tensile strength of PVC/TPU blends changes little, elongation at break decreases, while the impact strength greatly increases, toughening of PVC is realized. © 2018, Editorial Board of Polymer Materials Science & Engineering. All right reserved.