The effects of polypropylene grafted with maleic anhydride (PP-g-MA) and epoxy resin (ER) on the interfacial interaction of the long glass fiber reinforced PP composites were investigated by means of scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and mechanical properties. The experimental results demonstrate that PP-g-MA and ER could effectively improve interfacial interaction between the PP and LGF. Based on SEM, good interfacial adhesion between PP and LGF in PP/ PP-g-MA/ER/LGF composite was observed. DSC results showed that the existence of PP-g-MA or ER caused crystallization temperature shift to low temperature, and melting temperature shift to high temperature. All results in this paper were consistent, and showed the good interaction between PP and LGF, which were proved by the mechanical properties of the composites

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