Interfacial Chemistry And Material Properties Of Wood-plastic Composites

This study primarily focused on the process of the preparation of wood-plastics composites. Modern instrumental analysis, including Scanning Electron Microscopy (SEM), Fourier Transform Infrared Absorption Spectrum (FTIR), Ultraviolet Spectrum (UV) and X-Ray Photoelectron Spectrometric were used to elucidate the interfacial structure of the wood-plastics composites, the effect of the interfacial modifiers and the connection mechanism between wood and plastics. The study indicates that:1. The overall quantity of organic solvents increases benefits the disperse of the fiber in the non -polar hydrocarbon polymer.2. After the treatment, the C-O-C bond increased and the hydroxy groups decreased, probably due to the dehydration between hydroxy groups. This change may good to the combine of wood and plastics.3. At the transverse section of wood-plastics composites, the wood fiber and the plastic united closely, and the surface of the wood fiber covered with plastic. The wire drawing in the transverse section indicates that the formation of binding layer between the fiber and plastic transferred the crack from the interface to the inner of the plastic when the sample was ruptured.4. Compared with the untreated sawdust, the treated sawdust is more easily to be plasticized, and the flow-ability is better. The tension, compression and flexure strength of the composites of the treated sawdust and PE obviously increased.5. By addition of biphasic solvent A, the flow-ability, flexibility and elasticity increased. By addition of biphasic solvent B, the disperse of the fiber and plastic improved and the rigidity and brittleness increased. The addition of biphasic solvent C could improve the mechanical properties slightly.