Polypropylene Case Study

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Material properties: List of Materials used: 1. Clear Polycarbonate – curved seat structure of the chair, curved solid structure of the bar and the bar counter top. 2. Coloured Polypropylene - back rest of chair and curved solid structure of the bar. 3. Stainless Steel – support beam and stand as well as support pillars on bar. Properties 1. Polycarbonate contains a complex chemical structure. It is the strongest and toughest of all translucent materials. Polycarbonate can hold its strength at high and low temperatures. It does not burn easily. This is why I chose to use this material because of it good properties. 2. Polypropylene - is a tough plastic. It is similar to polyethylene but contains a higher tensile strength. It also has a greater stiffness and better…show more content…
Polypropylene production: Polypropylene can be manufactured in three ways, including hydrocarbon slurry or suspension, Bulk slurry, Gas phase. • Hydrocarbon Suspension uses liquid inert hydrocarbon diluent to transfer the polypropylene to the catalyst, heat is then removed from the system, and the atactic polymer is removed. • Bulk slurry uses liquid propylene instead of liquid inert hydrocarbon diluent. The polymer does not dissolve into a diluent. The formed polymer is withdrawn and any unreacted monomer is removed. • Gas phase: Uses gaseous propylene in contact with the solid catalyst, resulting in a fluidized-bed medium. 3. Stainless steel is made by melting iron ore, chromium, silicon and nickel together in an electric furnace. The mixture is then cast into shapes including blooms, billets and slabs. It is then cast into a solid form, treated and cleaned. A polish is then added for the desired finish. Restrictions of the materials; 1. Polycarbonate, if coloured can fade overtime. It can scratch over time, or if it is manufacture thin, in can warp or bend. 2. Polypropylene can degrade when exposed to excessive heat. I external application it may crack due to exposure to harsh

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