The authors wish to revise the affiliation, due to the errors regarding affiliation in this published paper [...]

Magnesium-cemented poplar particleboard (MCPB) is a new environmental inorganic magnesium cementitious composite without formaldehyde release. In this study, soybean flour (SM), silane coupling agent (KH560), soybean protein isolate (SPI), polyethylene glycol (PEG-400), maleic anhydride (MAH), and polyacrylic acid (PAA) were added to MCPB to improve the mechanical properties, waterproofing properties, and flame retardancy. The results show that the SPI group had the best mechanical performance; the modulus of elasticity (MOE) was up to 5192 MPa and exceeded the Chinese national standard GBT 4897-2015 (GBT) by 67.4%, the modulus of rupture (MOR) reached 17.72 MPa and exceeded GBT by 18%. Thickness swelling (TS) after 24-hour immersion was 0.29% and reached the standard of GBT (≤16%). The fire resistance test of MCPB indicated that the KH560 group improved the flame retardancy, the heat release rate (HRR) was 18kW/m2, the total smoke produced (TSP) was 0.192 m2, the total heat release (THR) was 29.71 MJ/kg, which reached the Chinese national standard GBT 8624-2012.

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Magnesium-cemented straw composites (MCSC), as an environmentally friendly and energy-conserving material, have an enormous potential to achieve favorable properties, especially for bending strength. In this study, rice straw powder, fly ash, and magnesia cement (MC) were mixed to prepare MCSC. An optimization formula for composites was found to promote the bending strength by 490% from 0.28 MPa (empty sample) to 13.89 MPa (composites). From the variance results, the molar ratio of MgO/MgCl2 (M value) and addition of rice straw (As) noticeably impacted the compressive and bending strengths. The optimum schemes were:10% (weight ratio) for rice straw, 10% for fly ash (Af), 5 for M value, 12 to 15 for H value (the molar ratio of H2O/MgCl2), 20-mesh of straw powder (Ms), and 28 days for the curing time (T). Considering the different use of MCSC, if the weight vector was 0.7 (compressive strength) and 0.3 (bending strength), the optimized formula was M5H25Ms20T15daysAs10%Af10%. If the weight vector was 0.3 (compressive strength) and 0.7 (bending strength), the optimized formula was M5H10Ms20T3daysAs10%Af10%.

Magnesium oxychloride adhesive (MOA) is a kind of inorganic adhesive with a low energy consumption and environmental protection. The modified particleboard with magnesium oxychloride adhesive (MOPB) has the advantages of no volatiles and has a high mechanical strength. In this study, MOA and poplar shavings were used to prepare MOPB, fly ash (FA) was used to modify and enhance the properties of MOPB; the influence mechanism on the mechanical of MOPB was studied. Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) were used to analysis the bonding mechanism of MOA and poplar shavings, and the composite system model of MOPB was constructed. The mechanism of modified MOPB with FA (MOPB-FA) was clarified. The results show that the use of FA effectively improved the mechanical strength of MOPB, and when the ratio of FA addition was 15 wt%, MOPB-FA’s modulus of rupture (MOR) value was 16.32 MPa, an increase of 24.5% more than before (13.11 MPa). The modulus of elasticity (MOE) value was 4595.51 MPa, an increase of 76.7% more than before (2600 MPa), and the thickness of swelling (TS) value was 0.35%, a decrease of 85.2% less than before (2.36%).