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An improved pull-out test method for bamboo fiber(BF)reinforced polypropylene(PP)composite,can quantitatively assess the respective contribution of physical and chemical bonding to a BF and PP polymer interfacial bonding,which was regulated through different concentrations of maleated polypropylene(MAPP)and silane(KH-550)coupling agents.Moreover,the interphase thickness of the resultant composites was characterized with a novelty AFM based nanomechancial imaging technique,namely Peakforce Quantitative Nanomechanics(PQNM)technique.The results indicate the contribution of physical and chemical bonding to the total interfacial shear strength(IFSS)can be easily discriminated and quantified from the obtained force-displacement curves.Furthermore,the IFSS and interphase thickness were all positively correlated to the concentration of MAPP and silane coupling agents but with less significance for the latter.MAPP is found to possess better performance in interfacial improvement than KH-550 silane for the composite system investigated in the present study.