期刊
POLYMERS
卷 11, 期 12, 页码 -出版社
MDPI
DOI: 10.3390/polym11121996
关键词
eco-friendly adhesive; sucrose; citric acid; plywood
资金
- Natural Science Fund for Colleges and Universities in Jiangsu Province [19KJB220010]
- Scientific Research Foundation of Nanjing Forestry University [GXL2018009]
In previous research, sucrose and citric acid were used to synthesize an eco-friendly plywood adhesive. Herein, further research was performed to determine the optimal hot-pressing conditions and curing behavior of a sucrose-citric acid (SC) adhesive. The results of dry and wet shear strength measurements showed that the optimal hot-pressing temperature, hot-pressing time, and spread rate of plywood samples bonded by the SC adhesive were 190 degrees C, 7 min, and 140 g/m(2), respectively. When plywood was bonded at the optimal hot-pressing conditions, the wet shear strength met the requirements of the China National Standard GB/T 9846-2015. Thermal analysis showed that the thermal degradation and endothermic reaction temperatures of the SC 25/75 adhesive were lower than either sucrose or citric acid individually. In addition, the insoluble mass proportion increased with the heating temperature and time. The Pyrolysis Gas Chromatography and Mass Spectrometr (Py-GC/MS) analysis confirmed that the SC adhesive was cured by the reaction between furan compounds, saccharide, and citric acid, and the resulting polymer appeared to be joined by ether linkages.
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