Abstract: Amino resin mould plastics were prepared from corn stalk fiber as reinforced materials and amino resin as polymeric matrix. The effects of corn straw fiber mass fraction on bending strength, impact strength of mould plastic were investigated. The internal-surface bonding performances of fibers and the amino resin were characterized by SEM, and the mechanical properties and thermal stability of that analyzed by DMA and TG. The results show that the mechanical properties of mould plastic are excellent, while the corn straw fiber mass fraction of 31%,with a bending strength of 60.41 MPa, and the impact strength of mould plastics 1.81 kJ/m². The energy-storage modulus and comprehensive mechanical properties are excellent. The compatibi-lity between corn stalk fibers and amino resin are poor. The weight loss rates of mould plastics increase from 0.5% to 2% when the temperatures do from 68.8℃ to 114.3 ℃ and it increases up to 26% when the temperature of 246.0-345.2 ℃. The effects of corn straw fiber mass fraction on the thermal stability of mould plastics are insignificant.

Key words: corn straw fibers, amino resins, mould plastics