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Raw and Finished Materials by Brian Dureu

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4

Thermosets

Thermoset plastics undergo a non-reversible hardening when they cure, either through a thermal or chemical reaction. Unlike thermoplastics, they cannot be remelted upon heating, and, when brought to a high enough temperature, will decompose and eventually burn. The polymer chains cross-link to one another with strong intermolecular bonds forming massive 3-D molecules. Once cured, thermosets are generally harder and stiffer than most thermoplastic materials. To increase the material’s strength, glass fibers or metallic powders are often added to the mixture before curing. Added graphite will increase the material’s lubricity for use as bearing surfaces, while various pigments and plasticizers are also used.

4.1 EPOXY

Epoxy, or polyepoxide, ...

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