Performance characteristics of materials Performance characteristics of papers and boards - Modern materials — AQA A-Level Design and Technology: Product Design
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Performance characteristics of materials Performance characteristics of papers and boards - Modern materials explained
A modern material is a material developed or refined through recent technological advances, often with enhanced properties for specific applications.
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In AQA 7552, the specified modern materials are Kevlar, precious metal clay (PMC), high-density modelling foam and polymorph. Kevlar is a high-strength, low-density aramid fibre used in body armour and composites because of its high tensile strength and cut resistance. Precious metal clay is a mouldable clay containing fine metal particles and an organic binder; after firing, the binder burns away and the metal particles sinter into a solid precious metal object, making it suitable for jewellery. High-density modelling foam is a rigid polyurethane foam that can be shaped, sanded and painted, used for prototyping and model making.
Your focus
- Define the term modern material.
- Name the four specified modern materials in AQA 7552.
- Explain the suitability of each modern material for a given application.
Show all 4 objectives
- Distinguish modern materials from smart materials.
Performance characteristics of materials Performance characteristics of papers and boards - Modern materials exam tips
Marking Points
- A modern material is one developed or significantly improved through recent technology, often with enhanced performance for specific uses.
- Kevlar is an aramid fibre with high tensile strength and low density; it is suitable for body armour, helmets and composite reinforcement.
- Precious metal clay (PMC) is a mouldable clay containing fine metal particles and an organic binder; after firing, the binder burns away and the metal particles sinter into a solid metal object, making it suitable for jewellery and small decorative items.
- High-density modelling foam is a rigid polyurethane foam that can be shaped, sanded and painted; it is suitable for prototyping, architectural models and product mock-ups.
- Polymorph is a low-temperature thermoplastic that softens in hot water around 60 °C, can be moulded by hand, and hardens on cooling; it is suitable for custom grips, ergonomic handles and temporary repairs.
- Suitability is explained by matching material properties to application requirements, e.g. Kevlar's high strength-to-weight ratio suits protective clothing, while polymorph's low softening temperature suits hand-forming complex shapes.
Examiner Tips
- 💡Memorise the four specified modern materials and one key property and application for each.
- 💡When explaining suitability, use the structure: property of material → requirement of application → why it works.
- 💡Avoid using smart materials such as shape memory alloy as examples of modern materials unless the question explicitly asks for a comparison.
- 💡For precious metal clay, remember the two-stage process: mould while clay-like, then fire to sinter the metal particles.
Common Mistakes
- Listing fibre optics, graphene, LCDs or nanomaterials as the specified modern materials; the AQA 7552 list is Kevlar, precious metal clay, high-density modelling foam and polymorph.
- Confusing modern materials with smart materials; smart materials respond reversibly to stimuli, whereas modern materials are defined by recent development or refinement, not by a stimulus response.
- Describing precious metal clay as a metal alloy; it is a clay-like composite of metal particles and binder that becomes solid metal only after firing.
- Stating that polymorph hardens by chemical reaction; it is a thermoplastic that softens on heating and hardens on cooling, with no chemical change.