In this paper,basalt fiber(BF)was used as reinforcement phase and polypropylene(PP)as the matrix,BF/PP foam composites were prepared using a chemical foaming secondary mold opening process.The thermal properties,rheological properties,foaming behavior and mechanical properties of BF/PP foam composites modi-fied with different sub structure coupling agents were studied using DSC,SEM and other characterization tech-niques.The results show that after modifying BF with different molecular structure coupling agents,the crystalliza-tion and rheological properties of the composite improve,the crystallinity increase,and the melt viscoelasticity im-prove.When KH-550 is used to modify BF,the foaming quality of BF/PP foamed composites is the best,with a foam cell size of 84.52 μm.Cell density is 2.45×105 cells/cm3.After BF is modified by coupling agent,the flexural strength,flexural modulus,and tensile strength of the foam composite are improved compared to those of the unmodified BF;When modifying BF with KH-792,the maximum flexural strength,flexural modulus,and tensile strength are 33.4 MPa,1919 MPa,and 21.4 MPa,respectively.This study provides a theoretical reference for the development and industrial application of BF/PP foam composite materials.
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