Natural fibers reinforced composites (NFCs) have renewable and low cost advantages. In this paper, the tung oil anhydride (TOA) modified polypropylene (PP)/hemp fiber composites have been prepared by a melt-blended process. The reaction between the tung oil anhydride and the as-treated hemp fiber make the TOA molecules to accumulate on the surface of hemp fiber and to form a TOA layer on the surface of hemp fibers, which is confirmed by the FT-IR and SEM analyses. The TOA layer improves the compatibility between PP matrix and hemp fibers. The elongation at break (EB) and impact strength of the PP/hemp fiber/TOA composites are twice more than the PP/hemp fiber composites. Thermal analysis shows the T_oneset, and T_max of the composites increasing that reflects the thermal stability of the composites improved. The crystalline property reveals that the T_c moves to high temperature with the TOA or hemp fiber added in the blends. The DMA and rheology properties analysis indicate that the TOA layer improved molecular mobility of the composites and show a shear thinning effect.

天然纤维增强复合材料（NFC）具有可再生和低成本优势。本文采用熔融共混法制备了桐油酸酐（TOA）改性聚丙烯（PP）/麻纤维复合材料。桐油酸酐与经处理的大麻纤维之间的反应使TOA分子积聚在大麻纤维的表面上，并在大麻纤维的表面上形成TOA层，这已通过FT-IR和SEM分析得到证实。TOA层改善了PP基体与大麻纤维之间的相容性。PP /麻纤维/ TOA复合材料的断裂伸长率（EB）和冲击强度是PP /麻纤维复合材料的两倍。热分析显示T _oneset和T _max复合材料的热稳定性增加反映了复合材料的热稳定性。晶体性质表明，在共混物中加入TOA或大麻纤维后，T _c移至高温。DMA和流变性质分析表明，TOA层改善了复合材料的分子迁移率，并显示出剪切稀化作用。