Imitating Spiders to catch flying insects: Realizing high-strength bonding of bamboo scraps/magnesium oxychloride lightweight composite interface

Sheng, Guoan; Zuo, Yingfeng; Zheng, Long; Li, Xingong; Wu, Yiqiang

doi:10.1016/j.compscitech.2022.109767

Cited by 7 publications

(1 citation statement)

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“…Subsequently, the cross section analysis of the MOC composites was then carried out using SEM and energy-dispersive spectrometry (EDS) scanning (Figure d). The section of the unmodified MOC composites is mainly composed of a disordered short rod-like crystal structure; Mg, O, and Cl were found to be the predominant elements using the EDS elemental analysis, which are the characteristic elements of the 5-phase crystals. , In contrast to the unmodified MOC composites, which were filled with cross-linked needle and rod-like 5-phase crystals, no 5-phase crystals were observed in the holes of the 5% DTPA-modified MOC composites, and the surface of the holes was relatively smooth (Figures S2 and S3). The reduction in needle and rod-like 5-phase crystals resulted in the formation of more short-rod 5-phase crystals in the Mg 2+ coordination polymer, and this change gave the MOC composites better mechanical properties.…”

Section: Resultsmentioning

confidence: 99%

High-Bond-Strength, Water-Resistant Magnesium Oxychloride Cement-Based Inorganic Adhesive Inspired by Adsorbed Heavy Metal Ions

Zhang,

Zhao,

Dong

et al. 2024

ACS Sustainable Chem. Eng.

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Magnesium oxychloride cement (MOC) has good compressive strength, cures in air, adheres to the surface of many materials including wood, and is being developed as a wood adhesive; however, MOC has poor water stability and easily loses mechanical strength and bonding ability in aqueous environments, and the penetration of wood is nonhomogeneous. Inspired by the adsorption of heavy metal ions, diethylene triamine pentaacetic acid (DTPA) was introduced to improve the water stability and homogeneous penetration of MOC composites. The −COOH of DTPA has a chelating effect on Mg 2+ , and the 5-phase crystals formed during hydration of MOC composites grow in situ on DTPA, which protects the 5-phase crystals from hydrolysis in aqueous environments. The physical anchoring effect and the interaction with the hydrogen bonding provided better interfacial bonding of the MOC composites when used as wood adhesives. The compressive strength of MOC with 5% DTPA reached 31.23 MPa after 7 days of water soaking, 774.79% higher than that of pure MOC. The MOC adhesive with 1% DTPA achieved a wet lap strength of 2.36 MPa, 59% higher than that of the pure MOC adhesive. Overall, DTPA can significantly improve the water stability and homogeneous penetration of MOC composites and can be applied as a wood adhesive, which provides theoretical support for developing and utilizing formaldehyde-free adhesives for wood construction.

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Section: Resultsmentioning

confidence: 99%