Physical Properties of PPEs
Typical physical properties of polyphenyl ethers are provided in Table 2. Physical properties of a particular PPE depend upon the number of aromatic rings, their substitution pattern, and whether it is an ether or a thioether. In the case of products of mixed structures, properties are hard to predict from only the structural features; hence, they must be determined via measurement.
The important attributes of PPEs include their thermal and oxidative stability and stability in the presence of ionizing radiation. PPEs have the disadvantage of having somewhat high pour points. For example, PPEs that contain two and three benzene rings are actually solids at room temperatures. The melting points of the ordinarily solid PPEs are lowered if they contain more m-phenylene rings, alkyl groups, or are mixtures of isomers. PPEs that contain only o- and p-substituted rings have the highest melting points.
| Polyphenyl Ether | Appearance | Pour Point
°F (°C) |
Thermal Stability
°F (°C) |
Viscosity (cSt) at
100°F (38°C) |
Viscosity (cSt) at
210°F (99°C) |
|---|---|---|---|---|---|
| 6-Ring 6P5E | Clear Liquid | 50 (10) | 836 (447) | 2000 | 25 |
| 5-Ring 5P4E | Clear Liquid | 40 (4.5) | 847 (453) | 360 | 13 |
| 4-Ring 4P3E | Clear Liquid | 10 (-12) | 825 (441) | 70 | 6 |
| 3- and 4-Ring Oxythio | Hazy Liquid | -20 (-29) | 693 (367) | 25 | 4 |
| 3-Ring 3P2E | Solid | - | 800 (427) | 12 | 3 |
| 2-Ring 2P1E | Solid | - | >600 (316) | 2.4 | 1.6 |
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