Polyfphenylene oxide

Figure 10.1 Chemical structures of polystyrene and polyfphenylene oxide)...

Polyfphenylene oxide) is an amorphous thermoplastic material with a low specific gravity, high impact strength, chemical resistance to mineral and organic acids, good electrical properties, and excellent dimensional stability at high temperatures. It has exceptionally low water absorption and complete hydrolytic stability. 

Noryl, for example, is composed of polystyrene, an inexpensive polymer, and polyfphenylene oxide) or PPO, a relatively expensive polyether. For the most, the properties of Noryl are additive. For example, Noryl has poorer thermal stability than the polyether alone, but is easier to process. Its single glass transition temperature increases with increasing polyether content. In terms of tensile strength, however, the polyblend is synergistic. 

Commercial polymers based on the principle of synthesis of polyaromatic compounds include the previously discussed commercial polymers—aromatic polyamides, polyimides, polyfphenylene oxide), polysulfone, and polybenzimidazole (see Chapter 4). 

Pozniak, G., Gancarz, I. and Tylus, W. 2006. Modified polyfphenylene oxide) membranes in ultrafiltration and micellar-enhanced ultrafiltration of organic compounds,... 

Kumazawa, H. and Yoshida, M. 2000. Mechanism of gas transport of NHj-plasma-treated polyfphenylene oxide) membranes. 

Polyfphenylene oxide) (PPO), also known as Polyfphenylene ether) (PPE), is a well-known synthetic polymeric material widely used in electrical or electronic equipments, vehicle parts and business machines due to its balanced mechanical properties, low moisture absorption, excellent electrical insulation property and dimension stability. PPO is one of the most important engineering plastics first synthesized by Hay et al in 1959 by the oxidative polymerization... 

Poly(phenylene sulfide) (PPS) is the thio analogue of polyfphenylene oxide) (PPO) [57]. The first commercial grades were introduced by Phillips Petroleum in 1968 under the trade name Ryton. Other manufacturers also have introduced PPS (e.g., Tedur by Bayer). The commercial process involves the reaction of p-dichlorobenzene with sodium sulfide in a polar solvent. 

Mica is also used in high density polyethylene to make blow molded rear seat backs and load floors used in intermediate size cars and vans to replace much heavier steel assemblies. The mica imparts stiffness and heat resistance. Mica is very effective in foamed plastics, especially polyethylene copolymers, and modified polyfphenylene oxide). It promotes a very uniform cell structure with improved strength and stiffness, and unexpectedly increased impact resistance. The high stiffness of mica gives improved sound transmission, so that it is used in loudspeaker cones, cabinets and earphones. Paradoxically, mica is the preferred mineral in coatings based on polyurethane or asphalt binders to reduce road and motor noise and to damp vibrations. 

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