1. Engineering
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  3. 2 a consider the following list of materials used in...

Question: 2 a consider the following list of materials used in...

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2 a) Consider the following list of materials used in different applications. Is the material listed suitable for the corresponding application? Justify your answer on the basis of the materials properties. i A freezer food box made of polypropylene homopolymer. i) A car bumper made of acrylonitrile/butadiene/styrene terpolymer (ABS). A soft toy for babies made of phthalate-plasticised polyvinylchloride (PVC). A degradable suture made of ultra-high molecular weight polyethylene. An insert for a bullet-proof vest made of polystyrene homopolymer iv) v) (15 marks) b) Styrene and butadiene can be copolymerised to give either a rubber or a thermoplastic elastomer. What is the difference in copolymer structure between the two types of materials? (2 marks) c) Sketch the stress-strain curves for a brittle polymer, a ductile plastic and an elastomer. (3 marks)
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