You have been assigned to select a polymer for a wall plug. Your choices are PET and Polypropylene. Discuss what you would expect in electrical properties, what physical property requirements would be required, and which polymer might be the best choice
What will be an ideal response?
You would expect the complexity of the PET chain to significantly decrease its conductivity compared to polypropylene. The crystallinity of polypropylene may also slightly increase the conductivity of the PP. The physical requirements would have to do with the forces that are applied on the wall plug. The main forces are
applied when an appliance is unplugged from the wall socket. These forces might include tensile, flexural and maybe even torsional forces, all of which would need to have greater cyclic strength than single instance, max load strength. PP would be the most logical choice for the wall plug for reasons such as resistance to stress cracking and lower costs as compared to the PET.
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