I just left out a sentence in my above answer! below are my complete answer. Whether the inorganic rigid particles can toughen and reinforce the polymers simultaneously is a very meaningful topic both to the theories and to the industrial applications. Recently, treating the interfaces between those particles with the coupling agent has been reported to have a marked toughening effect on the polymers, at the expense of a lowering of tensile strength of the systems. Taking the composites, whose substrates made of polyethylene modified by various percentages of silica powder, as the research objects, the results of the mechanical property tests showed that the ones doping with coupling agents tend to increase the bonding force between the silica and the polyethylene, by improving the interface structure and the compatibility. When the mass fraction of silica and that of the silane coupling agent are less than 10% and equal to 1% respectively, the prepared polyethylene/silica composite possesses better overall properties. In comparison with the pure polyethylene, the stretch property and elongation at break were both improved as well, revealing that silica particles were well dispersed within the substrate. The strong interface combinations and the winding of chains between the silica and the resin substrate are conducive to the improvement of processing fluidity and mechanic properties. However, too much filling amount of silica will lead to the opposite consequences.

Whether the inorganic rigid particles can toughen and reinforce the polymers simultaneously is a very meaningful topic both to the theories and to the industrial applications. Recently, treating the interfaces between those particles with the coupling agent has been reported to have a marked toughening effect on the polymers, at the expense of a lowering of tensile strength of the systems. Taking the composites, whose substrates made of polyethylene modified by various percentages of silica powder, as the research objects, the results of the mechanical property tests showed that the ones doping with coupling agents tend to increase the bonding force between the silica and the polyethylene, by improving the interface structure and the compatibility. In comparison with the pure polyethylene, the stretch property and elongation at break were both improved as well, revealing that silica particles were well dispersed within the substrate. The strong interface combinations and the winding of chains between the silica and the resin substrate are conducive to the improvement of processing fluidity and mechanic properties. However, too much filling amount of silica will lead to the opposite consequences.

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