• Applied Chemistry for Engineering
• /
• v.10 no.1
• /
• pp.46-50
• /
• 1999

Effects of $(NH_4)_2HPO_4$ and boron compounds ($Na_2B_4O_7:H_3BO_3=5:1\;ratio$) on the flame retarding characteristics of the surface modified wood powder-filled polypropylene composites were studied experimentally. The mechanical properties of m-phenylene dimaleimide(PDMI)-modified polypropylene composite were also compared with those of unmodified one. The flame retardance of $(NH_4)_2HPO_4$-modified wood powder composites was more improved than that of boron compounds-modified one. The impact strength of composites increased and the tensile strength of those decreased progressively with an increase of wood powder loading. The mechanical properties of modified polypropylene composites are more improved than those of unmodified one. The tensile strength also increased marginally with increasing the concentration of flame retardants, yielding a maximum when the concentration of flame retardant is 25.0 wt %. And the tensile strength of the composite was increased up to 16 wt % with increasing concentration of PDMI.