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Thermoset Plastics

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Examples: amino, epoxy, phenolic, and unsaturated polyesters.
Reaction when heated:
* Heating a thermoset degrades the material so that it cannot be reprocessed satisfactorily.
* Because processing of this material causes the permanent cross-links between adjacent molecules, movement (shaping) is prevented at any temperature
Thermoplastic:
Examples: Acetal, acrylic, cellulose, acetate, nylon, polyethylene, polystyrene, vinyl, and nylon.
Reaction when heated:
* becomes soft and moldable, solidifies when cooled; (thermoplastic elastomers* or TPE's remain flexible even when cooled).
* the linked chains of molecules are able to flow into a different shape because they can move relative to each other when heated.
Reaction when the cycle is repeated:
* recycling reduces mechanical properties and appearance.
* Elastomers = flexible materials that can be stretched to about double their length and returned to their original length when released. They are often used in the place of rubber and can be added to rigid thermoplastics to improve the impact strength.

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