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The fiber and powdered reed straw fibers of different sizes were pretreated with 2% NaOH solution at 180°C and 6MPa for 8min. The straw board without adhesive was prepared by hot pressing. The surface morphology, energy spectrum analysis, thermal stability and mechanical properties of the straw board were studied. The experimental results showed that the surface Si content of straw was significantly increased by alkali activation pretreatment, and the mechanical properties of straw board were significantly improved. The static bending strength (MOR), elastic modulus (MOE) and internal bonding strength (IB) were significantly increased, while the water absorption and expansion rate (TS) were significantly decreased. Compared with fibrous straw board, the fiber bond of straw board made from powdered straw is more compact, its mechanical properties are improved greatly, and its water absorption and expansion rate are reduced obviously.

Effect of fiber size of straw on properties of straw board