7073183
Description
Flashcards by Alex Naylor, updated more than 1 year ago
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Created by Alex Naylor
almost 8 years ago
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| Question | Answer |
| Long-chain molecule | The main constituent part of a polymer. The long-chain molecule is made up of a series of atoms - in the case of the hydrocarbons these would be made up of hydrogen and carbon along with elements such as oxygen. |
| Polymer | The proper term for a plastic material. |
| Cellulose | A constituent part of timber. Approximately 55 percent of tree is made up of cellulose. This material can be used to produce a cellulose based polymer. |
| Thermoplastics | Materials that can be repeatedly reheated and remoulded. |
| Thermosets | These undergo a chemical change resulting in them becoming permanently rigid i.e. they can't be reheated and reshaped. |
| Elastomers | These are polymers that have good elasticity, i.e. they can be distorted under pressure but will return to their original shape when the pressure is removed. |
| General properties of plastics | - They are good electrical and thermal insulators -They have a good strength to weight ratio. This does not mean they are strong materials, just that they have good strength compared to their weight. - Generally, they have good atmospheric and chemical corrosion resistance. |
| ABS | - Thermoplastic - Acrylonitrile Butadiene Styrene - High impact strength - Scratch resistant - Lightweight - Durable - Used in: kitchen products, mobile cases, monitor cases, safety helmets, toys, car parts, household telephones |
| CA | - Thermoplastic - Cellulose Acetate - Tough and rigid - Transparent - Lightweight with good strength - Non flammable - Used in: photographic film, handles for cutlery, cupboard door knobs, frames for glasses |
| Nylon | - Thermoplastic - Polyamide - Hard - Tough - Resistant to wear with a low coefficient of friction - Used in: bearings, gears, curtain rail fittings and clothing |
| PMMA (PolyMethylMethAcrylate) AKA Acrylic | - Thermoplastic - Acrylic - Food-safe - Tough - Hard - Durable - Easily machined - Used in: light units, illuminated signs, lenses for car lights |
| PP | - Thermoplastic - PolyPropylene - Lightweight - Food-safe - Good impact resistance even at low temperatures - Good chemical resistance - Used in: food containers, medical equipment, string and rope |
| HIPS | - Thermoplastic - High Impact Polystyrene - Good strength and stiffness - Lightweight - Good impact resistance even at low temperatures - Used in: toys and refrigerator linings |
| PS | - Thermoplastic - Polystyrene - Rigid - Colourless - Lightweight - Low impact strength - Used in: packaging, disposable cups and plates, containers |
| Expanded Polystyrene | - Thermoplastic - Floats - Good sound and heat insulator - Lightweight - Low strength - Used in: Packaging, disposable cups, sound and heat insulation |
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