Question 1: Explain the difference between thermoplastic and thermosetting polymers. Provide one example of each.

Answer: Thermoplastics can be melted and reshaped multiple times because their polymer chains are not cross-linked; thermosets cannot be reshaped once set due to cross-linking. Example of thermoplastic: Polyethylene; example of thermoset: Epoxy resin.

Question 2: Describe three common uses of polypropylene in everyday products.

Answer: Polypropylene is used in food containers, plastic bottle caps, and automotive parts due to its toughness, chemical resistance, and flexibility.

Question 3: Identify two advantages and two disadvantages of using polymers in product design.

Answer: Advantages include lightweight and corrosion resistance. Disadvantages include environmental impact and potential degradation over time.

Question 4: Design Brief: You are tasked with designing a reusable water bottle made from polymers. Consider factors such as safety, durability, and environmental impact. Sketch a simple side view of your design and label key features.

Answer: A clear side sketch of a water bottle including features such as a screw cap, ergonomic grip, and a label area. Key features labeled: body, cap, grip area, and label space.

Question 5: List three environmental concerns associated with the use of polymers and suggest one way to mitigate each issue.

Answer: Concerns: pollution due to disposal, non-biodegradability, and resource depletion. Mitigations: recycling programs, developing biodegradable polymers, and using recycled materials in production.

Question 6: Draw a simple diagram of a cross-section of an injection moulded polymer product, such as a plastic container. Indicate the main features of the moulding process.

Answer: A cross-section sketch showing the mould cavity, the injected molten polymer, and the ejector pins. Labels should include: mould cavity, injection point, cooling channels, and ejector mechanism.

Question 7: What are some key considerations when selecting a polymer material for outdoor use? List at least three factors.

Answer: Weather resistance, UV stability, impact strength, and resistance to temperature changes.

Question 8: Sketch a flexible polymer material that could be used for a wristband. Show its cross-sectional view and label the features that contribute to its flexibility.

Answer: A layered cross-section with an elastic core or flexible polymer, with labels for the core material, outer layer, and any reinforcement features that maintain flexibility.

Question 9: Describe the process of recycling polymers and outline the main steps involved.

Answer: Recycling involves collection, sorting by type, cleaning, shredding into smaller pieces, melting, and then remoulding into new products.

Question 10: Identify a polymer suitable for making food packaging and justify your choice based on its properties.

Answer: Polyethylene (specifically Low-Density Polyethylene) is suitable because it is lightweight, flexible, and resistant to chemicals, making it ideal for food packaging.