The Effect of Cellulose Surface Treatment on the Fracture Toughness of Microfibrillated Cellulose Reinforced Unsaturated Polyester Composites

초록

As a reinforcing filler of unsaturated polyester resin (UPR), the surface modification of microfibrillated celluloses (IVIFCs) was conducted with allyltrimethoxy silane (VPS) to increase interfacial adhesion between filler and UPR matrix. The surface modification reaction of the pristine MFCs was confirmed by FTIR, XPS and SEM/EDX. Two different UPR composites were prepared by the pristine MFCs and VPS-MFCs, respectively for comparing their fracture toughness and mechanical properties. The results of tensile and impact properties for the UPR composites showed the better performance of VPS-MFC/UPR composites than of the pristine MFC/UPR composites. Indeed, the results of the critical stress intensity factor (K-IC) and the critical strain energy release rate (G(IC)) pointed out the improved interfacial adhesion between UPR matrix and cellulosic filler in the VPS-MFC/UPR composites, which induced their enhanced fracture toughness.

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