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Polyphenylene Oxide ( PPO ) Modified - Properties and Applications - Supplier Data by Goodfellow

Although unmodified Polyphenylene Oxide (PPO) is a semi-crystalline thermoplastic, all commercially available grades are blended with (high impact) polystyrene in order to improve melt processability.

A wide range of proportions, together with the use of other modifiers, results in a good range of grades with differing properties tailored to the needs of individual end-uses.

These blends are amorphous, opaque, pale grey engineering thermoplastics with a balance of properties (and cost) not unlike nylon but without nylon’s high water absorption and consequent dimensional instability.

However Polyphenylene Oxide (PPO)Modified has poor fatigue characteristics and poor solvent, though good hydrolysis, resistance.

Applications

Applications of Polyphenylene Oxide ( PPO ) include electrical and TV components, washing and dish-washing machine parts, automobile parts (especially fascias) and structural foam.

Key Properties

The key properties of Polyphenylene Oxide ( PPO )Modified are tabulated below.

Table 1. Key properties

Chemical Resistance
Acids – concentrated Fair
Acids – dilute Good
Alcohols Fair
Alkalis Good
Aromatic hydrocarbons Poor
Greases and Oils Fair
Halogens Poor
Ketones Fair
Electrical Properties
Dielectric constant @ 1 MHz 2.7
Dielectric strength ( kV.mm-1 ) 16-20
Dissipation factor @ 1 kHz 0.004
Surface resistivity ( Ohm/sq ) 2x1016
Volume resistivity ( Ohm.cm ) 1017
Mechanical Properties
Abrasive resistance - ASTM D1044 ( mg/1000 cycles ) 20
Coefficient of friction 0.35
Elongation at break ( % ) 50
Hardness – Rockwell M78/R115
Izod impact strength ( J.m-1 ) 200
Poisson's ratio 0.38
Tensile modulus ( GPa ) 2.5
Tensile strength ( MPa ) 55-65
Physical Properties
Density ( g.cm-3 ) 1.06
Flammability HB
Limiting oxygen index ( % ) 20
Resistance to Ultra-violet Good
Water absorption - over 24 hours ( % ) 0.1-0.5
Thermal Properties
Coefficient of thermal expansion ( x10-6 K-1 ) 60
Heat-deflection temperature - 0.45 MPa ( °C ) 137
Heat-deflection temperature - 1.8 MPa ( °C ) 125
Lower working temperature ( °C ) -40
Thermal conductivity ( W.m-1.K-1 ) 0.22 @ 23
Upper working temperature ( °C ) 80-120

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Goodfellow supplies metals, ceramics and other materials to meet the research, development and specialist production requirements of science and industry worldwide.

Source: Goodfellow.

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