Effects of compound emulsifiers on properties of wood adhesive with high starch content |
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| Affiliation: | 1. Key Laboratory of Food Science and Technology, Jiangnan University, 1800 Lihu Avenue, 214122 Wuxi, People’s Republic of China;2. School of Food Science and Technology, Jiangnan University, 1800 Lihu Avenue, 214122 Wuxi, People’s Republic of China;3. Synergetic Innovation Center of Food Safety and Nutrition, Jiangnan University, Wuxi 214122, China;1. Department of Chemical and Biological Engineering, Centre for Catalysis Research and Innovation, University of Ottawa, 161 Louis Pasteur Pvt., Ottawa, Ontario K1N 6N5, Canada;2. Department of Chemical Engineering, Queen’s University, 9 University Ave, Kingston, Ontario K7L 3N6, Canada;3. EcoSynthetix Inc., 3365 Mainway, Burlington, Ontario L7M 1A6, Canada;1. Key Laboratory for Utility of Environment-friendly Composite Materials and Biomass in Universities of Gansu Province, College of Chemical Engineering, Northwest Minzu University, Lanzhou 730030, PR China;2. Key Laboratory of Western Mineral Resources of Gansu Province, College of Geological Science and Mineral Resources, Lanzhou University, Lanzhou 730000, PR China;1. State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, China;2. School of Food Science and Technology, Jiangnan University, Wuxi 214122, China;3. Synergetic Innovation Center of Food Safety and Nutrition, Jiangnan University, Wuxi 214122, China |
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| Abstract: | Lauryl sodium sulfate (LSS) combined with alkylphenol ethoxylates (APEO) were used to enhance the performance of a high starch content wood adhesive (HSWA). The optimal shear strength, mobility and viscosity stability of the wood adhesive after repeated freeze–thaw cycling were gained when LSS to APEO ratio was 7 to1, which could efficiently solve storage problems caused by a high starch content. Through blue value and differential scanning calorimetry (DSC) analysis, it was proved that the structure of the complexes formed between amylose and the compound emulsifiers with LSS/APEO mixing ration of 7:1 was the most stable. Scanning electron microscopy (SEM) images and particle size analysis showed that compound emulsifiers could significantly suppress the aggregation of emulsion particles. The mechanism could be, on the one hand, attributed to stable complexes formed by compound emulsifiers and amylose which could restrain starch retrogradation, and on the other to the synergetic effect of electrostatic charge forces and space steric hindrances caused by the LSS/APEO mixture adsorbed on the surface of latex particles. In conclusion, the addition of an LSS/APEO(mixing ratio 7:1) mixture could significantly prevent the aggregation of latex particles and retrogradation of starch molecules, indicating that these compound emulsifiers could be applied in the preparation of a high starch content wood adhesive. |
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| Keywords: | Wood adhesive High starch content LSS APEO Storage stability |
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