Preparation and properties of geopolymer/soy protein isolate composites by in situ organic-inorganic hybridization: A potential green binder for the wood industry
Journal of Cleaner Production(2020)
摘要
Geopolymers have the potential to be used as environmentally friendly construction materials and binders. In this study, green geopolymer/soy protein isolate (SPI) composites were hybridized in situ by forming in situ SPI resin in metakaolin-based geopolymer. Preheating treatment accelerated the setting reaction but reduced the density and mechanical strength of the geopolymer/SPI composites. High flexural strength and interfacial compatibility between the in situ SPI resin and geopolymer were detected in the geopolymer/SPI composites with low SPI loadings (<= 5 wt%). Reduced flexural strength and poor compatibility were observed when SPI content was greater than 10 wt%. Bonding of the geopolymer/SPI composites as a green binder for wood was also examined by studying the interfacial morphology and shear strength between the wood and the geopolymer/SPI binder. The interface formed via mechanical occlusion and the diffusion of compounds between wood and the geopolymer/SPI binder. Robust mechanical bonding was observed between the wood and the geopolymer/SPI binder when the addition of SPI was low (1 and 5 wt%). However, the bonding strength declined as SPI content increased to 10 and 20 wt%. This study elucidated the effects of in situ organic-inorganic hybridization of protein on geopolymers. The obtained composites can potentially be used as a green adhesive resource in the wood industry. (C) 2020 Published by Elsevier Ltd.
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关键词
Geopolymer,Soy protein isolate,In situ hybridization,Organic-inorganic hybridization,Wood adhesive,Interface
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