Development and characterization of a defatted soy flour-based bio-adhesive crosslinked by 1,2,3,4-butanetetracarboxylic acid

A new, environmentally friendly defatted soy flour-based bio-adhesive was developed by using the cross-linker 1,2,3,4-butanetetracarboxylic acid (BTCA). The reaction between BTCA and defatted soy flour was confirmed by assaying the free amino groups, by Fourier transform infrared spectroscopy (FTIR)...

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Bibliographic Details
Published in:International journal of adhesion and adhesives 2017-10, Vol.78, p.148-154
Main Authors: Zheng, Peitao, Lin, Qiaojia, Li, Feng, Ou, Yangting, Chen, Nairong
Format: Article
Language:English
Subjects:
Adhesives
Bio-adhesive
BTCA
Crosslinking
Defatted soy flour
Electron microscopy
Flour
Fourier transforms
Infrared spectroscopy
NMR
Nuclear magnetic resonance
Plywood
Scanning electron microscopy
Shear strength
Stability analysis
Surface stability
Thermal stability
Thermodynamic properties
Thermogravimetric analysis
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Summary:A new, environmentally friendly defatted soy flour-based bio-adhesive was developed by using the cross-linker 1,2,3,4-butanetetracarboxylic acid (BTCA). The reaction between BTCA and defatted soy flour was confirmed by assaying the free amino groups, by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction, and 13C nuclear magnetic resonance (13C NMR). Three-ply plywood was fabricated to measure wet shear strength, and the cross-section and thermal behavior of resultant adhesives were characterized in detail. A decrease in the free amino group content, a new ester peak in the FTIR spectra, a weaker resonance at 65.4–76.2ppm in 13C NMR, and a decrease in crystallinity confirmed that BTCA was successfully crosslinked with defatted soy flour. The resulting crosslinked bio-adhesive showed improved wet shear strength (1.36MPa) and a reduced sol fraction (24.8%). The crosslinked bio-adhesive displayed enhanced thermal stability, and had a more uniform surface based on thermogravimetric analysis and scanning electron microscopy. The results suggest BTCA can be used to prepare high-performance environmentally friendly defatted soy flour-based bio-adhesives.
ISSN:0143-7496
1879-0127
DOI:10.1016/j.ijadhadh.2017.06.016