Flashcards
Polymers
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- 1PolymersThermoplastic: A material which can be repeatedly reheated and reshaped, allowing it to be recycled after its initial use. Thermoplastics have long linear chain molecules held by van der Walls forces. - Low Density Polyethylene (LDPE), High Density Polyethylene (HDPE), Polypropylene (PP), High IMpact Polystyrene (HIPS), Acrylonitrile butadienestyrene (ABS), Polymethyl methacrylate (PMMA), Polyethylene terephthalate (PET), Nylon, Rigid and flexible polyvinyl chloride (PVC).
Thermosetting polymer: A material which when heated undergoes a chemical change whereby the molecules form rigid cross links. Thermosetting polymers cannot be reheated and reshaped, even at very high temperatures. - Urea formaldehyde (UF), Melamine formaldehyde (MF),
Elastomer: A material which at room temperature can be deformed under pressure and then upon release of the pressure, will return to its original shape. Elastomers have weak bonds which allow them to stretch easily. They can be stretched repeatedly and upon immediate release of the stretch, will return with force to the original length
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- A level Design and Technology FlashCards sobre Polymers, criado por 15 ThompsonR em 06-12-2021.
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- 15 ThompsonR
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