Construction of compatible interface of straw/magnesium oxychloride lightweight composites by coupling agents

摘要

To solve the problem of agricultural waste, modified straw/magnesium oxychloride lightweight composites (M-SMOCL) with light-weight and high strength were prepared using magnesium oxychloride cementitious material (MOC) as the matrix, modified straw as reinforcing material and other reagents as additives. The effects of coupling agents, including KH-550, KH-560, KBM-603, HY-201, on straw groups and water absorption, as well as the mechanical strength and water resistance of the composites, were examined and discussed. The results showed that coupling agents reduced straw hydrophilicity and water absorption, improved composite performance. KBM-603 in particular possessed the best modification effects, with water absorption of straw treated with IBM-603 decreased to 27%, and the composite compressive and bending strengths of reached the maximum values of 12.93 MPa and 4.78 MPa, respectively. FT-IR and SEM showed that straw treated with KBM-603 bonded more closely to the matrix, creating the best interface results. (C) 2021 Elsevier Ltd. All rights reserved.