Evaluation of curing and thermal behaviors of konjac glucomannan–chitosan–polypeptide adhesive blends

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ABSTRACT An environmentally friendly wood adhesive has been achieved through novel blending of konjac glucomannan and chitosan with polypeptide. Tensile tests reveal an optimal curing temperature of 130°C. Both viscoelastic properties of the adhesive blends during curing process, and the structural variation of chemical components induced by curing temperature, were defined by using dynamic rheometry, X‐ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy. Results show both storage and loss modulus increase markedly from 90 to 105°C because of the reactions occurred between konjac glucomannan, chitosan, and polypeptide with formation of amide. Increased polypeptide content not only strengthens intermolecular hydrogen bonds but also enhances covalent reactions occurred between the components. Thermogravimetric and differential scanning calorimetry analyses indicate good miscibility of components in the adhesive blends and improved thermal stability with added polypeptide. Hydrogen bonds between polysaccharides and polypeptide break at 125 ± 10°C. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42202.

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