Abstract: Polypropylene (PP)/wood-flour foam composites were prepared in a regular injection molding machine via chemical foaming method. The effects of contents of AC, PP-g-MAH, and wood-flour on the apparent density, mechanical property, and microstructure of the composites were studied. When the content of AC was 1.2 phr, the foaming effect of the composite was the best, and the impact strength reached a maximum value of 20.23 kJ/m2. When the content of PP-g-MAH was 15 phr, the interfacial compatibility between wood-flour and PP, mechanical properties, and foaming effect of the composite were significantly improved. Excess loading of wood-flour led to decreasing of mechanical properties and foaming effect, and increasing of apparent density. The optimum content of wood-flour was 30 phr.

Key words: polypropylene, wood-flour, injection molding, composite, formula, foaming