Plastics; Properties And Shaping Processes
Full Answer Section
- Blow molding: This process is used to make hollow plastic products, such as bottles and jars.
- Extrusion: This process is used to make continuous plastic products, such as films and sheets.
Examples of Products Made with PET
- Plastic water bottles
- Food containers
- Toys
- Medical devices
- Clothing fibers
- Industrial packaging
Conclusion
PET is a versatile and widely used polymer with a variety of properties that make it suitable for a wide range of applications. It is important to note that PET is not biodegradable, so it is important to recycle PET products whenever possible.
Sample Solution
Polymer Information Table
| Property | Value | Source |
|---|---|---|
| Polymer Name | Polyethylene terephthalate (PET) | Wikipedia: https://en.wikipedia.org/wiki/Polyethylene_terephthalate |
| Abbreviation | PET | |
| Crystallinity | Semi-crystalline | PET is a semi-crystalline polymer, meaning that it has both crystalline and amorphous regions. The crystallinity of PET can vary depending on how it is processed, but it is typically around 30-50%.[1] |
| Type | Thermoplastic | PET is a thermoplastic polymer, meaning that it can be melted and re-shaped multiple times. This is due to the fact that the polymer chains are not cross-linked.[2] |
| Melting Point (Tm) | 257-267°C | Wikipedia: https://en.wikipedia.org/wiki/Polyethylene_terephthalate |
| Glass Transition Temperature (Tg) | 76°C | Wikipedia: https://en.wikipedia.org/wiki/Polyethylene_terephthalate |
| Biodegradable | No | PET is not biodegradable, meaning that it does not break down naturally in the environment. This is due to the fact that the polymer chains are very strong and resistant to degradation.[3] |
Shaping Processes
PET can be shaped into various products using a variety of processes, including:
- Injection molding: This process is used to make a wide variety of products, including plastic water bottles, food containers, and toys.
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