摘要：

The effect of steam explosion on cotton stalk and properties of cotton-stalk/HDPE composites was studied with mechanical comminution method as comparison.After being treated by these two methods,cotton stalk powder was dried below 105 ℃.Screening and taking were 40 to 60 meshes screening which was characterized by SEM.Its RWCA was measuring by capillary rise method.These two kinds of cotton stalk powder were mixed with HDPE according to a certain mass ratio respectively,then by granulation,extrusion molding,the mechanical properties and water absorption of WPC was measured.According to SEM characterization,the dispersion of the cellulose of steam exploded cotton stalk powder was good.The length-diameter ratio of the cellulose was high.The cellulose of cotton stalk which was mechanical comminuted was still in bundle.The length-diameter ratio was low.According to the measurement of RWCA,the RWCA of the steam exploded cotton stalk powder was 3.9%larger than the other kind of powder and the hydrophobic property of the former was better.After measuring the mechanical properties and water absorption of the WPC,the tensile strength and flexural strength of steam exploded cotton stalk powder/HDPE composite were higher than the other one which was up to 23.9%and 16.0%respectively.The water absorption of steam exploded cotton stalk powder/HDPE composite was lower than the other one which was up to 84.6%.

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