Improvement of bleached wheat straw pulp properties by using aspen high-yield pulp

► Addition of 5-20% aspen HYP into BWSP can improve its drainage and bulk obviously. ► Addition of HYP fibers resulted in more pores in the BWSP fiber network. ► Mixing BWSP with HYP had a synergistic effect on the light scattering coefficient. ► The BET surface area and micro-pore volume increased with increasing the HYP ratio. ► The addition of aspen HYP can significantly increase the tear index of BWSP.