As a new elastomer, polyolefin elastomer POE has good processability and mechanical properties, and its toughening effect on polypropylene is better than EPDM and EPR [1]. However, there is no literature to study the effect of POE on the fracture toughness of PP. In this paper, a newly developed method, Basic Fracture Method (EWF), was used to study the fracture toughness of PP and PP/POE * * * blends with different Poe contents, and its mechanical properties were analyzed.

Under the condition of room temperature and low-speed stress (5mm/min), the tensile fracture experiments of injection-molded double-sided deep notch tensile samples were carried out. According to EWf theory [2], the total fracture work Wf required for tensile fracture of notched specimens can be divided into two parts: basic fracture work We and non-basic fracture work or plastic work Wp. We are used to form a new fracture surface, which is the surface energy. For a sample with a certain thickness (t), it is directly proportional to the ligament of the sample, that is, the remaining length (L) of the notch, and Wp is the part of work consumed in plastic deformation, which is the volume energy and is directly proportional to l2.