The linear and branching architectures of thermoplastic polymers soften when heated and solidify when cooled. In contrast, once thermosetting polymers have hardened, they won't soften when heated because of their cross-linked and networked structures.
Engineering polyesters are thermoplastics with engineering applications made of PBT (Polybutylene Terephthalate) and PET (Polyethylene terephthalate). Polyester resins have high dimensional stability, chemical resistance, and mechanical, electrical, and thermal properties.
A plastic polymer with qualities similar to those of a polymer resin is known as a thermoplastic polymer. When heated, this material softens and may be shaped into any desired size and shape. It retains the formed shape and size after cooling and turns hard and unyielding.
Polyester can be a thermoset or a thermoplastic, depending on its chemical makeup. The most popular polyesters are thermoplastics, while there are also polyester resins that are hardened by hardeners.A thermoplastic is a substance, typically a plastic polymer, that softens when heated and hardens when cooled.
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