Modified polyphenylene oxide properties

In more recent times GE Plastics has upgraded their Noryl range of PS-modified polyphenylene oxide materials without recourse to halogens. Improved flame retardant properties are found in the new Noryl GTX 4110 series, which uses a proprietary flame retardancy system free from halogens and red phosphorus. The compound has high heat and chemical resistance. 

The above materials are crystalline polymers, and such materials have generally superior frictional, wear and fatigue properties, compared with amorphous polymers. However, amorphous polymers show lower mould shrinkage and where dimensional accuracy is paramount they may be preferred. Suitable engineering types are polycarbonate (PC) and noryl (styrene modified polyphenylene oxide). 

As a 6.4-mm (i-in.) wall, for example, both modified polyphenylene oxide and polycarbonate resin exhibit the best processing, properties, and cost— in the range of a 25 percent... 

Glass-reinforced modified polyphenylene oxide is a tough, rigid thermoplastic with excellent dielectric properties, high moisture resistance, and dimensional stability. 

TABLE 3-83. PHYSICAL AND MECHANICAL PROPERTIES OF MODIFIED POLYPHENYLENE OXIDE... 

Modified polyphenylene oxide (PPO) and polyphenylene ether (PPE) resins were first commercialised in the mid 1960s. PPO and PPE are similar in chemical composition and properties... 

Story BS, Koros WJ. Sorption and transport properties of CO2 and CH4 in chemically modified polyphenylene oxide. J. Membrane Sci. 1992 67 191-210. 

Polyphenylene oxide (PPO) or Polyphenylene ether (PPE) is an amorphous polymer with a softening temperature of about 210 °C. To improve its processability it is mostly blended with PS (modified PPE, e.g. Noryl ), which is at the cost of its heat distortion temperature. The properties are excellent the applications are mainly in fine-mechanical construction, in automotive parts, in household equipment etc. 

The phenylated polyphenylene oxide (0 P 0 0) was sulfonated using a slightly modified procedure of Makowski et al. A detailed description of the sulfonation and some properties of these materials is reported elsewhere . Sulfonated polymers (S 0 P 0 0 Acid) with equivalent weights of 1200, 600 and 510 were used for blending with ethyl acrylate copolymers. 

Property data for GRTP s are presented in two major breakouts. In the first breakout, the basic resins—styrene acrylonitrile (SAN), polycarbonate, polysulfone, polyacetal, polypropylene, polyphenylene oxide (PPG), nylon, modified PPG, and polyvinyl chloride—are treated as the independent variables and the physical, mechanical, electrical, thermal, chemical, and weathering characteristics are treated as the dependent variables. In the second breakout, the functional relationships are reversed, te., the properties are the independent variable and the resins are the dependent variable. ASTM test methods by which the physical values were determined are listed. The. physical data versus resins are presented in both tabular and graphic form. 

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