As shown in Fig. 3, for tensile strength at break, there was a significantly increase for the three carboxylic acids tested compared to the PP/TPS blend without any compatibilization (about 15.5 MPa), with values ranging between 16.9 MPa for C16 and almost 19.5 MPa for C18. It should be noted that stearic and myristic acids probably promoted a better interfacial adhesion between phases and there was not significant differences compared to blends with PPgMA.