The effect of oxidated glucose on the performance and structures of polyamide resins synthesized by citric acid and hexanediamine
Gaoxiang Xu, Qianyu Zhang, Guanben Du, A. Pizzi, Hong Lei, Xuedong Xi
Abstract
A thermoset polyamide resins were synthesized by citric acid and hexanediamine (CH), and was modified by oxidized glucose (OG). The effect of oxidation time and addition amount of oxidized glucose on shearing strength of plywood were characterized. Fourier transform-infrared (FT-IR) and liquid chromatography-mass spectrometry (LCMS) were used to determine the structures of the resins, the result shows that CH and OG reacted to form macromolecules. Differential Scanning Calorimeter (DSC), dynamic mechanical properties (DMA) were used to analyze its thermal properties, the results indicate that OG improved the storage module and the heat resistance. The CHOG resin exhibited a good bonding strength and water resistance, when the oxidation time is 0 min and the molar ratio of oxidized glucose to hexamethylene diamine is 1:1.6. Dry strength, 24 h wet strength and 63 °C hot water soaking wet strength of the plywood bonded with it are 1.36 MPa, 1.60 MPa, 1.49 MPa, respectively. Therefore, OG enhanced the shearing properties, and improve water resistance, which sheds new light on the preparation of bio-based wood adhesive for the manufacture of plywood.