Effect of Silane grafted polypropylene on the property of different filler/polypropylene composites

The effect of silane grafted polypropylene on the property of different filler/polypropylene composites was determined. Polypropylene (PP) composites filled with tale (Ta), baryta sulfate and calcium carbonate coupled with silane grafted polypropylene (P-g-Si) were made, their mechanical properties and thermal properties were investigated. As compared with the non-coupled composites, the mechanical properties of PP/Ta/PP-g-Si composites were improved to some extent, though the values of tensile modulus and the strain at peak were decreased. But for PP/BaSO₄ and PP/CaCO₃ composites, the values of their mechanical properties varied slightly or even decreased with increasing PP-g-Si content within the experimental component. Meanwhile, PP-g-Si also affected the melting and crystallization behavior of P in the composites. The experiment shows PP-g-Si offers compatibilization in PP/Ta composites, but offers no-compatibilization in PP/BaSO₄ and PP/CaCO₃ composites within the extent of the present range of PP-g-Si, which shows that PP-g-Si can be used as the macromolecular coupling agent of PP and Ta composite.