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The Preparation and Properties of Wood Fiber/Polyolefin Blends Composites

Author: GaoHua
Tutor: WangQingWen
School: Northeast Forestry University
Course: Biological materials engineering
Keywords: Wood fiber PP - PE blends Graft Mechanical Properties Rheological properties
CLC: TQ320.1
Type: Master's thesis
Year: 2008
Downloads: 57
Quote: 1
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Abstract


Production with lignocellulosic material composite wood-plastic composite materials are an important way, however, is the efficient use of waste plastics, waste plastics are often composed by the different nature of several non-polar polymer waste mixtures, plastic components, plastic The compatibility between the wood fiber, but also due to the degradation of other reasons, resulting in poor mechanical properties of wood-plastic composite materials, and therefore the need for waste plastic modified. In this paper, the reactive extrusion method, maleic anhydride (MAH) grafting monomer as a functional initiator dicumyl peroxide (DCP), in a twin-screw extruder of polypropylene - polyethylene ( The PP-PE) the mixture was subjected to melt blending graft. In the graft-modified polyolefin blend as a substrate, and the wood fiber composite prepared wood-plastic composite material. On the basis of the new plastic, waste plastic. Fourier transform infrared spectroscopy and scanning electron microscopy analysis of polyolefin blends graft were characterized by mechanical tests and rheological analysis method polyolefin blends graft and mechanical properties of wood-plastic composites and dynamic rheological properties of evaluation and research. Studies have shown that, by contrast graft product ungrafted PP-PE infrared spectra prove that the MAH has successfully grafted onto PP-PE. After the compatibility between the improvement in the graft modification, the blend components, and thus the tensile strength has been greatly improved, but the impact strength was slightly decreased. The the graft reaction MAH dosage and conditions of grafting a great impact, thereby affecting the mechanical properties of the graft product. Matrix graft PP-PE as wood-plastic composites, whether or not the new plastic waste plastic, wood fiber has been to improve the interface between PP-PE blends, thus improving the mechanical properties of the composite material. When the the MAH amount of 1.0%, the bending strength of wood fiber / plastic composites and unnotched impact strength were increased by 50.4% and 90.8%, respectively wood fiber / waste plastic composites bending strength and notched impact strength 40.2% and 53.4%, respectively. The result of observation of the scanning electron microscope also showed that the graft-modified, not only to improve the compatibility of the PP-PE blend system, but also to improve the compatibility between the wood fiber and the PP-PE blend. Rotational rheometer to determine the linear viscoelastic region of the material through the dynamic strain sweep, the results show MAH substantially no effect on the amount of the graft copolymer with the linear viscoelastic range, the presence of the wood fibers of the composite linear viscoelastic The region in the lower strain amplitude range. The dynamic frequency scanning results showed that all samples showed the rheological behavior of the high-frequency region of similarity with respect to the high-frequency region, and rendered by the rheological parameters for the low frequency region is more significant differences. MAH dosage and screw speed on the rheological properties of the grafting process also in the low frequency region. Mean the difference of the rheological parameters before and after the polyolefin grafted polyolefin structure changes, indicating that the polyolefin blend degradation occurred in the grafting process, and may also produce a lightly crosslinked. The presence of the wood fibers of the rheological behavior of the composite system to the far deviation in the polymer matrix, showing very significant shear thinning behavior. \The above rheological results can be used as blends grafted polyolefin scientific basis for process control and mold design wood-plastic composite molding process.

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