PTFE /nano-SiO2 composites were prepared and the effect of nano-SiO2 by surface pre-treatment of nano-SiO2 ;selecting special macromolecule dispersing agent and master batch manufacturing technogy.The results showed the filling of nano-SiO2 decreased the breaking elongation of PTFE composites,but increased the tensile strength and the hardness of the materical.When the content of nano-SiO2 was 7% by mass, PTFE / nano-SiO2 composites had good mechanical properties.with the increase of nano-SiO2 content the PTFE composites changed from tuough and plastic into hard brittle material.
In this paper the toughening mechanism of PVC/CPE filled with nanoscale SiO 2 and the effects of nanoscale SiO 2 and common SiO 2 contents on properties of PVC/CPE were studied.The experimental results showed PVC/CPE/SiO 2 had excollent notched impact strength and tensile strength when nano SiO 2 content was 6 per cent to 12 per cent.Local SiO 2 had no obvious toughening effect on PVC/CPE,but made the tensile strength and elongation at break of PVC/CPE decreased obviously.
