Polyethylene terephthalate (PET)
Polyethylene terephthalate (PET) is an engineering thermoplastic from the polyester family. It is found in a wide range of applications and is used to produce plastic bottles (PET bottles), plastic films and textile fibers, among other things. Its mechanical properties are excellent.
Surface energy and contact angle
The following table shows the effect of plasma treatment with the plasma system plasmabrush PB3 on PET.
| Material: Polyethylene terephthalate | Surface energy | Contact angle H2O |
| Untreated | 48,0 mN/m | 75,0° |
| 5 minutes after plasma treatment | 74,5 mN/m | 20,5° |
| 1 hour after plasma treatment | 74,5 mN/m | 22,0° |
| 2 hours after plasma treatment | 74,5 mN/m | 19,0° |
| 4 hours after plasma treatment | 73,5 mN/m | 22,5° |
Applications
PET is used as a textile fiber because it is crease-resistant, tearproof and weather-resistant. The fiber absorbs only very little water and is suitable as a fabric for sportswear which needs to dry fast. Ultrathin, highly transparent foils and sheets are also made of PET.
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