Sure, here are 9 interesting facts about thermoplastics:

1. *Recyclability*: Thermoplastics can be melted and reshaped multiple times without undergoing significant chemical change, making them highly recyclable.

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2. *Wide Range of Applications*: They are used in various industries including automotive, aerospace, packaging, medical, and consumer goods due to their versatility and ease of processing.

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3. *Softening Point*: Unlike thermosetting plastics, thermoplastics soften when heated and solidify when cooled, which allows for easier molding and shaping.

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4. *Chemical Resistance*: Many thermoplastics have good resistance to chemicals, making them suitable for applications where exposure to corrosive substances is a concern.

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5. *Amorphous vs. Crystalline*: They can be amorphous (lacking a distinct crystalline structure) or crystalline (having an ordered molecular structure), which affects their properties and behavior.

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6. *High Strength-to-Weight Ratio*: Some thermoplastics, like high-performance polymers, can offer excellent strength-to-weight ratios, making them valuable in demanding applications.

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7. *Glass Transition Temperature (Tg)*: This is the temperature at which a thermoplastic transitions from a hard, glassy state to a more flexible, rubbery state. It's a crucial parameter in material selection.

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8. *Thermal Conductivity*: Thermoplastics generally have low thermal conductivity, which can be an advantage in certain applications, such as insulating materials.

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9. *Popular Types*: Some well-known thermoplastics include polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), and polyethylene terephthalate (PET), among others.

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