Modified polyphenylene oxide electrical

Within 10 years — from 1959 to 1969 — five new generics were introduced. In 1959, Du Pont introduced polyacetal, and Bayer and General Electric commercialized polycarbonate. Polyphenylene oxide was introduced by General Electric in 1962 and one of the first blends — modified polyphenylene oxide — debuted in 1965. Celanese commercialized polybutylene terephthalate (PBT) in 1968. 

During that year ULTEM polyetherimides were added to General Electric Plastics family of polymers which, at the time, included polycarbonates, modified polyphenylene oxides and polybutylene terephthalate. This addition was noteworthy because it occurred at a time when bringing totally new polymers from the research laboratory to the marketplace had become a rare event. 

TABLE 3-85. ELECTRICAL PROPERTIES OF MODIFIED POLYPHENYLENE OXIDE... 

Because of the Kmitation of temperature resistance, the use of plastic components in ovens has been mostly limited to exterior trim. Plastics however are gradually being used for semi-structural components. Endcaps with a metallic finish are a typical example. General Electric have used a sputter-coated modified Noryl polyphenylene oxide for a shiny metallic appearance for the Tappan oven. The material provides flame resistance, electrical insulation, and resistance to heat, grease, and abrasion. 

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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