Study On The Compatibilization Of PP/TPU Blends

In order to improve the compatibility of polypropylene/thermoplastic polyure -thane(PP/TPU), two different amine functionalized PP(PN1 and PN2) were preparedas compatibilizers by reactive extruding firstly, and two new blends——PP/PN1/TPUand PP/PN2/TPU were made by melt mixing through a twin-screw extruder. Besides, with TMPTA and TAIC as sensitizers, TPU/TMPTA, TPU/TAIC, PP/TMPTA/TPU and PP/TAIC/TPU were also prepared and irradiated by ⁶⁰Co-γ ray (radiation dose, D ≤25kGy, which is the common dose range of medical treatment ). It was investigated that the effect of compatibilizers(PN1 and PN2), sensitizers(TMPTA and TAIC) and y-radiation on the mechanical properties, dynamic mechanical properties, melt and crystalline behavior, rheological behavior and morphologies of blends. The main results are as follows.Two new compatibilizers(PN1 and PN2) were prepared successfully by melt extruding. IR characterization of PN1 and PN2 showed that graft reaction happened between PP-g-MAH and two different diamine, and amine functionalized PP was formed.PP and TPU were immiscible, which resulted in the inferior mechanical properties of simply blended PP/TPU sample. After adding PN1 and PN2, the compatibility of PP/TPU was improved effectively and the mechanical properties were also enhanced remarkably. Compared with mEPDM(EPDM-g-MAH), the compatibilization effect was ranked in a decreasing order as follows: PN2≥PN1> mEPDM. When the content of compatibilizers was 5 phr, PP/Compatibilizer/TPU blends had optimal mechanical properties.The compatibility of PP/TPU was improved by modest y-radiation, which resulted in the increase of the strength, rigidity and toughness. The introduction of sensitizers could also improve the compatibility of PP/TPU, and the compatibilization...