The surfaces of birch fibres(BF) and reclaimed pulp fibres were treated by some materials such as silane coupler,ethanol and water respectively,then the relevant BF/UPR(unsaturated polyester resin) composites were prepared with these modified fibres as reinforcing materials of UPR.The influences of different modified methods on interface properties of composites were investigated.The results showed that the influences of different kinds of fibres,different surface treatment methods for fibres and different ...