Non-degradable plastics damage the earth's ecological environment for a long time, and recycling waste plastics is a current research hotspot. In this paper, five-layer poplar wood veneers (single board weight 1.41g) are stacked in a staggered manner according to the grain direction, and a polyvinyl chloride (PVC) plastic film (single film weight 8.03g) is added between the layers, and dry hot molding is used (170 degree centigrade, 15 MPa, 30 min) in one step to produce odor-free high density wood plastic composite (HDWPC). The characterization results show that WPC has high density (1.45 g/cm3) and good mechanical and waterproof performance. The maximum bending and tensile strength can reach 150 and 400 MPa, respectively, and the water absorption thickness expansion rate of 72 hours is 4%. The cross-sectional scanning electron micrograph of HDWPC showed that the cell wall of poplar veneer was crushed, and the poplar veneer and PVC were fused with each other to form a substance like “glue nails” to enhance the physical bonding and bonding interface. FT-IR, XRD, XPS test results show that lignin melts during the hot-pressing process, and the depolymerized and reorganized lignin attaches to the surface of the cellulose to enhance the chemical bond between the components, except for the chemical bond between fibers (In addition to hydrogen bonds, ester bonds, ether bonds, etc., the introduction of PVC makes poplar veneer have other chemical bonds like C-Cl, C-C, C-O, etc., forming stable chemical crosslinks. The excellent physical properties and stable chemical structure enable the HDWPC prepared in this study to be used in the field of structural construction and furniture materials, and the non-degradable PVC is effectively recycled, maintaining the safety and balance of the ecological environment.

Study on preparation and performance of high-density plastic film/wood veneer composite

ACS Spring Meeting 2021

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