Compatibilisation du melange caoutchouc naturel/polypropylene (Nr/Pp)

Abstract

The objective of this work is to study the effects of the incorporation of a50/50 blend of Epoxidized Natural Rubber/Polypropylene-grafted maleic anhydride(ENR/PP-g-MA)as a compatibilizing agent(CA)for a thermoplastic elastomer based on a70/30Natural Rubber/Polypropylene NR/PPblend on the rheological,mechanical,dynamic mechanical,morphological and thermal properties. The cure response of a vulcanization system based on sulfur donors; namel: :tetramethylthiuram disulfide (TMTD),4,4'-Dithiodimorpholine(DTDM),and N-Cyclohexyl-2-benzothiazole sulfenamide(CBS)and the CA effects were assessed through the Brabender plastograms and swelling index.The rheological behavior was examined by means of a Rubber Process Analyser (RPA).The mechanical properties were determined by the tensile measurements, and the dynamic mechanical properties were also investigated.Scanning Electron Microscopy(SEM) and Atomic Force Microscopy(AFM)were used for the morphological examination. The thermal properties were measured by means of theDifferential Scanning Calorimetry(DSC)and Thermogravimetric Analysis (TGA). Evidence of compatibilizing effects was obtained from an improved mechanical and dynamic mechanical properties; which was attributed to a reduction of the interfacial tensions and an enhanced interphase interactions imparted by the CAs.