The effect of plant species on the accelerated weathering behaviors of polyvinyl chloride-based wood-plastic composites (WPCs) was studied. The selected plant species were eucalyptus, rice husk, and bamboo. The color and chemical compositional changes that occurred due to accelerated weathering were monitored using colorimetry and Fourier transform infrared spectroscopy. The lignin and carbonyl contents of the WPCs were altered with exposure. The color change and lightness of the weathered WPCs increased with exposure time, and the degree of increase depended on the plant species. The water absorption and swelling ratio of the WPCs increased with an increase in exposure. The eucalyptus-based composite was the highest ranked in terms of mechanical properties, and the microstructure of the impact section showed that the interfacial bonding performance deteriorated after exposure. In conclusion, the selection of plant fibers is critical to the service performance of WPCs.
High-tech enterprises have obvious knowledge-intensive and technical dense characteristics, and human capital plays an important role in the process of corporate knowledge creation. High-tech enterprise manpower capital stock, flow, and investment three perspectives have built the simulation model of high -tech enterprises human capital of the human capital of high-tech enterprises, using system simulation methods, based on the VENSIM PLE simulation environment, revealing the innovative consortium, hightech enterprise manpower The impact of capital on innovation performance. The research found that the contribution of human capital stock to innovative performance is the greatest, of which technical human capital has the most impact on the output of innovative performance; and the flow of human capital flow and investment are positive to promote innovative performance output, and the level of contribution is basically the same.
This work was aim to prepare a packing material from natural resources to reduce the environment pollution caused by plastics. Four bio-adhesives (guar gum, sodium alginate, agar and chitosan) were combined with lotus leaf fibers to prepare degradable composites, respectively. The mechanical properties, moisture absorption profiles and the thermal conductivity of the composites were studied and the cross section morphology and the thermal properties of the composites were analyzed. The Fourier-transform infrared spectroscopy (FTIR) results showed that the polar groups such as -OH and -COOin bio-adhesives can form hydrogen bond with -OH in lotus leaf fibers to connect the two components. The combination of agar and lotus leaf fiber was good, and their composite had the best mechanical properties, with the tensile strength, flexural strength and impact strength of 2.05, 5.9 MPa and 4.29 kJ•m −2 , respectively, and the composite had a low moisture absorption profile, and the equilibrium moisture absorption rate was 32.32%. The lotus leaf fiber/agar composite (LAC) had an excellent comprehensive performance and it was non-toxic, degradable and thermal insulating, which indicated that it had the potential to use in packaging field to substitute plastics.
With the widespread use of wood-plastic composites, they are inevitably affected by aging during transportation and outdoor use. In this research, in order to improve the aging resistance of WPC, acrylate-styrene-acrylonitrile (ASA) was used as modifier (10 parts, 15 parts, and 20 parts). The effects of the ASA modification on the aging behavior of eucalyptus/polyvinyl chloride (PVC) composites was studied with simulated xenon lamp artificial aging conditions. Artificial aging caused the physical and mechanical properties of the composites to deteriorate. After 960 h of aging, the aging resistance of the ASA-modified WPC was better than unmodified WPC and the sample with 15% ASA added had the best performance.
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