Abstract
In this study, glycidyl methacrylate (GMA) was grafted onto spirulina protein isolate (SPPI), a novel raw material, to increase its water resistance and create an eco-friendly wood adhesive. Papain used as the denaturing agent in the grafting procedure and ammonium persulfate (APS) as the radical polymerization initiator. Based on the water-resistant bonding strength of the grafted polymer, the factors that affect the grafting reaction were analyzed and the reactive conditions were optimized single-factor experiments. According to the most optimum reaction conditions and the optimal preparation conditions, the SPPI-GMA adhesive showed that the wet strength 1.45 MPa was improved around 210% (the dry strength improved around 100%) compared to the untreated SPPI. The results of Fourier transform infrared spectroscopy (FT-IR),13C-Nuclear magnetic resonance (13C-NMR) and X-ray diffraction (XRD) indicated that the GMA had been grafted on the SPPI successfully. In addition, the cure temperature of SPPI-GMA adhesive was analyzed by the Differential scanning calorimetry (DSC). Thus, the SPPI- GMA adhesive has the potential to be applied to the wood industry.
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