Polyphenylene Oxide PPO
|
The base member of this family, poly(phenylene oxide) which is abbreviation as PPO, is a crystalline thermoplastic with excellent heat distortion resistance but unable to be melt processed. The methyl substituted version is considerably less crystalline and can be melt processed in blends with other thermoplastics, e.g. with polystyrene (“Noryl” from Sabic Innovative Plastics).
|
> |
Contents
1 Properties
2 Grades Available
3 Applications
1 Properties
Below are a list of key properties of Modified PPO i.e. PPO/PS blend
- Being a blend it is opaque.
- Good dimensional stability.
- Good electrical properties.
- High heat distortion temperature above 100°C (up to 195 °C).
- Modified PPO blends are soluble in moderately polar solvents
- Hard, rigid, strong, reasonably tough and low creep.
- Being a blend it is opaque.
- Good dimensional stability.
- Good electrical properties.
- High heat distortion temperature above 100°C (up to 195 °C).
- Modified PPO blends are soluble in moderately polar solvents.
- Suffer the same problems of oxidation and UV ageing as polystyrenes unless suitably stabilised.
- UV exposure causes server colour changes.
2 Grades Available
Different PPO/PS grades are available with varrying proportions of PPO to deliver the required temperature resistance, and rubber content to give impact resistance.
PPO is also available as:
- "Noryl GTX" - a PA/PPO blend
- "Noryl PPX" - a PP/PPO blend
3 Applications
The good water, heat and electrical resistance make PPO/PS ("Noryl") suitable for hot water applications but many of the applications are in instrument housings and internal components in electrical equipment.
