Abstract: Hami feldspar was modified through surface wet method, which was used in polypropylene(PP)/modified feldspar composites. The properties and structure of PP/modified feldspar composites were characterized and analyzed. Interface contact angle measurement showed that the surface of modified feldspar particle was hydrophobic. When the loading of modified feldspar was 5 %, the tensile and impact strengths of PP/modified feldspar composites increased by 3.78 %, and 3.40 %, respectively, compared with those of neat PP. TGA showed that the heat decomposition temperature of the composites was 6.47 ℃ higher than that of neat PP. DSC determination indicated that modified feldspar acted as nucleation agent which promoted the crystallization rate and increased the crystallinity of PP.

Key words: polypropylene, modified feldspar, mechanical property, crystallization behavior