In this study,citric acid(CA)was used to modify ramie fiber(RF),and then the polybutadiene succinate(PBS)/modified RF bio-composites were prepared.Changes in the thermal stability,crystallinity,and morphology of CA-modified RF were investigated.The mechanism for the interface interaction between the CA-modified RF and PBS was analyzed.The optimal content of CA-modified RF for the bio-composites was determined to be 8 wt％according to their tensile properties.The bio-composites obtained tensile strength and modulus of 44.1 and 563.3 MPa,respective-ly.Meanwhile,the mechanical properties were compared between the PBS/CA-modified RF bio-composites and the corresponding bio-composites with the acetic acid(AA)-and sodium hydroxide(SH)-modified RF.The results indicat-ed that PBS/AA-and SH-modified RF bio-composites presented tensile strength of 40.2 MPa and 41.0 MPa,respec-tively,both of which were lower than those of the PBS/CA-modified RF bio-composites.
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