Sawdust Filler Research Articles

Physical and Mechanical Properties of Waste Sawdust Polymer Composite for Marine Application

In this research, wood polymer composite (WPC) were produced by using the combination of waste sawdust (Cengal and mixed sawdust), unsaturated polyester resin and a catalyst as the curing agent. The WPCs were produced at four levels of sawdust loading (5 wt% - 20 wt %) with resin and 3% of catalyst added to study the mechanical and physical proeprties. Micro structural analyses were done by scanning electron microscopy and the result showed that the sawdust filler were evenly dispersed in the resin matrix. The mechanical and physical properties of the composites are higher than unfilled resin. The optimum ratios were obtained for sawdust composite at 10 wt% where it showed the best performance than others.

Effect of Grafting with Maleic Anhydride on Interfacial Bonding of Rubber Wood Flour Filled Poly(propylene) Composite

SummaryThe process of making wood‐plastic composites with poly(propylene) as a matrix and rubber wood flour with particle size of 0.709 mm as a filler has been carried out by combination of the dry blending method and the extrusion treatment using twin screw extruder. The content of rubber wood flour was adjusted as 10wt% for each composite formula. Maleic anhydride grafted poly(propylene) (PP‐g‐MA) was added as a coupling agent at four concentrations, 0, 5, 10 and 15 wt%. Melt flow rate (MFR), crystalisation temperature and mechanical properties of composites indicate that increase in PP‐g‐MA generated decrease in melt viscosity significantly, which reversed MFR is increased, while mechanical properties increased due to interfacial bonding improved. Based on the differential scanning calorimetric analysis it was found that the mechanical properties and crystallization temperature increased with increasing PP‐g‐MA content, due to increase in interfacial bonding between matrix and sawdust fillers. In addition, fracture surface imaging analysis showed that good adhesion was present in the interface of composites between 10wt% and 15wt% PP‐g‐MA.

Immobilization of Phosphorus-Dissolving Bacteria on Sawdusts for Removing Phosphorus in Iron Ores

Nowadays, the immobilization of At.t is a research potential. The immobilization of At.t on the sawdust filler was discussed in this paper. The experimental results indicated that sawdusts, as the immobilization fillers, can provide a stable living microenvironment for At.t showing the favorable bioactivity and strong acid-producing capacity. Also, under the optimal conditions with the inoculums concentration 12.5%, sulphur dosage 1% (w/v), dissolved oxygen (DO) in the bioreactor above 6 mg/l, the conductivity, pH, and H+ in the bioreactor were 45.2 ms/cm，0.964, and 0.109 mol/l，respectively. In the leaching ore experiment within 24 hours, bacteria effect of phosphorus removal was unconspicuous.

Mechanical and Morphological Studies of Rubber Wood Sawdust-Filled UPR Composite Based on Recycled PET

Rubber wood sawdust fillers were mixed with unsaturated polyester matrix, which was prepared by recycling of PET waste from soft drink bottles, to prepare rubber wood sawdust/UPR composite. PET wastes were subjected to recycle by glycolysis and depolymerized to its monomer and dimmer. The glycolysed product was used to prepare unsaturated polyester resin. The FTIR analysis has been done on the resin and the glycolysed product. The resin then mixed with rubber wood sawdust fillers before and after alkali treatment with 10% NaOH. The effect of surface treatment and filler content on the mechanical properties and water absorption of the composite were studied. The tensile fractured surfaces of the composites were studied by Scanning Electron Microscopic (SEM) technique to investigate the interfacial bonding between the matrix and the filler. The results show that the tensile modulus increased with increasing filler contents. In addition, the results show that alkali treatment causes a better adhesion between rubber wood sawdust and UPR matrix and improves the mechanical properties.

The effect of alkali treatment and filler size on the properties of sawdust/UPR composites based on recycled PET wastes

AbstractIn this study, natural sawdust fillers from acacia were mixed with unsaturated polyester resin (UPR), which was prepared by recycling of polyethylene terephthalate (PET) waste bottles to prepare sawdust/UPR composite. PET wastes were recycled through glycolysis and depolymerized to produce a formulation for the resin. The effects of alkali treatment, filler content, and filler size on the tensile, flexural, hardness, and water absorption of the composites were investigated. The results show that the modulus of both tensile and flexural increased with increasing filler contents, but the tensile and flexural strength of composites decreased. The size of sawdust also played a significant role in the mechanical properties, with smaller size sawdust producing higher strength and modulus. This is due to the greater surface area for filler–matrix interaction. The results also show that alkali treatment causes a better adhesion between sawdust and UPR matrix and improves the mechanical properties of the composites. Furthermore, surface treatment reduced the water absorption of composites. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008

Characteristics of Wood Sawdust and Chips as Energy Absorption Filling Mediums

Wood sawdust and chips, as carpentry processes remains, are introduced as alternatives for filling mediums in energy mitigation systems. The natural, economical and environment friendly material, wood, is modeled and its interaction with the collapse of tubes, typical energy absorption elements, has been considered. Compression tests on wood sawdust were used to extract its mechanical properties and the results of which have been used in the validation of the analytical models. The collapse of PVC tubes, filled with wood sawdust of different grades and densifications, has been analyzed considering multi-lobe mode, concertina mode and mixed mode. In these models, the interaction of wood sawdust filler on the final mode of collapse of PVC tubes has been incorporated and the final values of the mean crushing load show favourable results.

Collapse behaviour of plastic tubes filled with wood sawdust

The influence of foam-like wood filler on the mode of collapse and energy absorption performance of polyvinylchloride (PVC) tubes has been investigated under quasi-static loading conditions. The mode of collapse of axially crushed PVC tubes has been found to revert from regular three-lobe diamond mode to axisymmetric concertina mode at a certain wood-filling density. The energy absorption capacity of the PVC tubes is enhanced by wood compression as well as by extra stretching in the tube circumference due to shifting from multi-lobe to axisymmetric mode. The collapse of the PVC tubes has been analyzed considering multi-lobe mode, concertina mode and mixed mode. In these models, the interaction of the wood sawdust filler on the final mode of collapse of the PVC tubes has been incorporated. The mean crushing load of the PVC tubes collapsing into the mixed mode is considered as the average mean of that of the concertina mode, the multi-lobe mode and that causing crushing of wood sawdust. Compression tests on wood sawdust were used to extract its mechanical properties and the results have been used in the validation of the analytical model. The analytical results obtained for the mean crushing load agree reasonably well with those from experimental observations.

Putting a (Large) Price Tag on Scientific Misconduct

IMAGINETHE FATE OF MR. JAMES FARBUCKLE, a sort of antihero of the Union Army dur ing the American Civil War. Farbuckle made his living by supplying casks of beef and other foodstuffs to various units of the Union Army. He made himself a pretty good living, too. In the early days of his career, he found he could buy his supplies at pretty low prices, then determine his prices to the Union Army by multiplying the costs by a large number. However, a new realization soon dawnedhe was giving over way too much material for the prices he charged. This little problem could be addressed in a couple of ways. First, by increasing the size of the multiplicand and, second, by diluting the amount of actual food in his casks. Sawdust, rotten meat, and other such fillers allowed Mr. Farbuckle to vastly improve his profit margin. Things went well for Mr. Farbuckle in the dawning years of the Civil War-he made himself a handsome little fortune and began to see himself as a self-made mogul. Of course, things did not go so well for the unlucky members of the Union Army who found themselves trying to live on an unsavory mixture of sawdust and rotten beef. Mr. Farbuckle was not the only culprit in these kinds of schemes, all meant to turn government war needs into private gains. By 1863, the problems grew to such proportions that President Lincoln signed the False Claims Act, informally known as the Lincoln Law. The Lincoln Law allows the government to recover up to three times the costs involved in making false claims for contractual work to the federal government. Just to complete the tale, our fictional Farbuckle lost his fortune under the Lincoln Law and finished out his days making insect boxes for an entomological curator in a small midwestern town. Critical readers (and anybody who reads these essays should be critical, indeed) are probably wondering how we are going to connect a fictional vignette to the day-to-day lives of working entomological scientists. Let us consider a new application of the False Claims Act. Eugene Dong (not a fictional