جستجوی مقالات مرتبط با کلیدواژه « چندسازه » در نشریات گروه « منابع طبیعی »

In this study, the effects of fish waste powder addition and the coupling agent Maleic Anhydride Poly Ethylene (MAPE) content on notched impact strength and physical properties of wood-plastic composite were studied. Wood flour (40%) was mixed with 60% of polyethylene (PE). Fish waste in three levels of 5, 10 and 15% was mixed into wood powder and coupling agent on three levels (0, 2 and 4) of PE in a domestic blender at 180 °C and a speed of 60 rpm. Standard composite samples were manufactured using injection molding. Notched impact strength and physical properties including water absorption and thickness swelling were measured. The results revealed that with a 15% increase in fish powder waste, the highest impact strength was gained along the lowest water absorption and thickness swelling. The increase in coupling agent concluded in impact strength and physical properties enhancement up to 4%.

This research considered the effect of thermal treatment of wood flour in different times and temperatures as an agent for treat properties of Populus wood flour/recycled polypropylene composites. Water absorption and thickness swelling tests as physical properties, tensile and bending strength as mechanical properties evaluated. The experimental results indicated that samples treated in 60 minutes and 200ºC had the lowest amounts in water absorption and thickness swelling tests but about samples treated in 20 minutes, 160 and 180ºC observed that the samples were treated in 160ºC had low amount of water absorption (63%) than the samples were treated in 180ºC (76%). Measuring of mechanical properties showed that the variable properties of composites were increased with the rising heat time, while the samples were treated at 60 minutes had 97% followed by the samples treated at 20 minutes had 14% amount more than control samples.

In this study, the effect of chemical modification of Lignocellulosic components on the mechanical properties of some fiber/plastic composites was investigated. Two types of lignocellulosic composites (Beech flour and rice husk fibers) were subjected to four types of chemical components (alkaline, silane, acrylic acid and benzoil chloride), and maleic Anhydride and polypropylene were attended as the coupling agents at two levels of 0 and 3 %. The FTIR spectroscopy was used to be sure of the chemical treatment of fibers. The tensile and impact properties of treated composites were measured and compared with the pure polypropylene and some untreated samples. The morphological changes of fibers and composites were investigated, using the scanning electronic microscope (SEM). The results showed that the chemical fiber modification led to a change of Ho group absorbance of lignocellulosic composites on 3900-4250 cm-1 band. The mechanical properties of composites showed that the chemical treatment of fibers improved the interfacial adhesion and so increased the modulus and tensile but decreased the impact strengths. The coupling agent also had a positive effect and increased the strengths and modulus. In most cases, some composites with beech flour treated by alkaline and coupling agent had more tensile strengths. The impact strength of silane treated composites increased considerably compared with the other treatments. Also, the simultaneous use of chemical components and coupling agent on the mechanical strengths had synergic effects.