Development of new natural polymer-based wood adhesives III: effects of glucose addition on properties of chitosan |
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| Authors: | Kenji Umemura Ayako Mihara Shuichi Kawai |
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| Institution: | (1) Civil Engineering Laboratory, National Engineering School of Tunis (ENIT), BP 37, 1002 Tunis Belvedere, Tunisia;(2) Department of Civil Engineering, Faculty of Engineering, Sherbrooke University, 2500, Boul. of Sherbrooke University, Sherbrooke, QC, J1K 2R1, Canada;(3) Department of Civil Engineering, Higher Institute for Technological Study (ISET) Sfax, BP 88-A, 3099 Sfax Boustene, Tunisia;(4) Department of Civil and Environmental Engineering, Engineering and Architecture College, University of Nizwa, PO Box 33, 616 Birkat Al Mouz, Nizwa, Sultanate of Oman; |
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| Abstract: | The effects of a Maillard reaction between glucose and chitosan on the resultant chitosan films and the bonding properties
of chitosans with different molecular weights were investigated. In film preparation, chitosan and glucose were dissolved
in 1% acetic acid and dried in a Petri dish at 50°C. The bonding properties of the Maillard-reacted chitosan in three-ply
plywood were evaluated by a tensile shear test. The weight, color, free amino groups, insoluble fraction, and thermal properties
of the film changed significantly as the amount of added glucose increased. However, few differences in these properties due
to the use of chitosan of different molecular weights were observed. The effect of glucose addition on the tensile strength
of the film differed for chitosans of different molecular weights. Improvement of the strength by 10 wt% glucose addition
was observed in low-molecular-weight chitosans. The dry- and wet-bond strengths were significantly enhanced with increasing
glucose addition for low-molecular-weight chitosans. In addition, good bond strength was maintained even in 1% acetic acid
solution. It was thus clarified that the bonding properties of low-molecular-weight chitosan were improved markedly by the
environmentally safe method of glucose addition. |
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