Study the Properties of Wood Fiber Reinforced Plastic Composite

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Abstract
Natural fibers are promising reinforcement to be used in thermoplastic composites due to their low weight and cost. The major usage of plastic composites is in transportation followed by the combined usage in marine and corrosive environments. However, the stability of wood plastic composite in corrosion and marine environment is not well understood. Manufacturers mostly rely upon some limited laboratory tests whose methodologies are useful for simulations but not for predicting product’s service properties. An investigation has been carried out to assess the properties of rubber wood fiber reinforced polypropylene composites; and environment stability of these composites has been studied at three different temperatures. The wood fiber used was of 100μm and 250μm sizes with 40, 50, 60 and 70% weight fractions. The contribution of MAH-PP coupling agent on these properties has also been studied on limited scale. The tensile and impact strengths of the composite sample are found to decrease with increase of fiber content. The tensile strength of 23.7MPa with 40wt% fiber sample decreased to 20.0MPa with 70wt% fiber sample of 250µm size. However, difference in fiber size did not affect the tensile and impact strengths. The difference between impact strengths of same amount of fiber wt% samples with 250µm and 100µm fiber sizes is constantly 0.6KJ/m2 for almost every wt% sample even with the MAH-PP treatment. Both the strengths are found to increase slightly in the sample containing MAH-PP treated fibers compared to the untreated ones. The water absorption is found to increase with the increase of both fiber content and temperature. For 50wt% MAH-PP treated fiber reinforcement, the 100µm sized fiber samples absorbed 5g/m2 of water which 25% higher water compared to the corresponding 250µm samples. This happened because the smaller fiber sample has higher surface area which gives larger fraction of exposed wood at the sample surfaces; this exposed wood at the surface is the source of water swelling in composites. The water absorption capacity of the samples with MAH-PP treated fibers was found to be 20 to 50% less than that of the untreated ones. It is presumed that the coupling agent on the fiber surface restricted water absorption of the composite samples. However, at higher temperatures the water absorption increased significantly. It is presumed that at higher temperature the coupling agent degenerated causing increased water absorption in the composite samples.

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APPROVAL PAGE
I certify that I have supervised and read this study and that in my opinion; it conforms to acceptable standards of scholarly presentation and is fully adequate, in scope and quality, as a dissertation for the degree of Master of Science in Manufacturing Engineering. ___________________________ Shahjahan Mridha Supervisor I certify that I have read this study and that in my opinion; it conforms to acceptable standards of scholarly presentation and is fully adequate, in scope and quality, as a dissertation for the degree of Master of Science in Manufacturing Engineering. ___________________________ Internal Examiner I certify that I have read this study and that in my opinion; it conforms to acceptable standards of scholarly presentation and is fully adequate, in scope and quality, as a dissertation for the degree of Master of Science in Manufacturing Engineering. ___________________________ External Examiner This dissertation was submitted to the Department of Manufacturing and Material Engineering and is accepted as partial fulfillment of the requirements for the degree of Master of Science in Manufacturing Engineering. ___________________________ AKM Nurul Amin Head, Department of MME This dissertation was submitted to the Kulliyyah of Engineering and is accepted as partial fulfillment of the requirements for the degree of Master of Science in Manufacturing Engineering. ___________________________ Ahmad Faris Ismail Dean, Kulliyyah of...
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