Polyphosphazene plastic

Specialty polymers achieve very high performance and find limited but critical use in aerospace composites, in electronic industries, as membranes for gas and liquid separations, as fire-retardant textile fabrics for firefighters and race-car drivers, and for biomedical applications (as sutures and surgical implants). The most important class of specialty plastics is polyimides. Other specialty polymers include polyetherimide, poly(amide-imide), polybismaleimides, ionic polymers, polyphosphazenes, poly(aryl ether ketones), polyarylates and related aromatic polyesters, and ultrahigh-molecular-weight polyethylene (Fig. 14.9). 

While phosphorus is not a common element in polymeric materials, other than in the polyphosphazenes, it does occur in a number of additives, such as secondary antioxidants and some plasticizers. The ehemieal-shift correlation chart of Fig. 26 illustrates that 8p depends largely on the oxidation state of the phosphorus, with P(III) species (such as phosphites) resonating between —450 and +250 and P(V) species (such as phosphates), between —50 and +100 ppm [17,18,60]. These shifts are relative to the reference... 

Polymer electrolytes are used in lithium ion rechargeable batteries. Pure polymer electrolyte systems include polyethylene oxide (PEO), polymethylene-polyethylene oxide (MPEG), or polyphosphazenes. Chlorinated PVC blended with a terpoly-mer comprising vinylidene chloride/acrylonitrile/methyl methacrylate can make a good polymer electrolyte. Rechargeable lithium ion cells use solid polymer electrolytes. Plasticized polymer electrolytes are safer than liquid electrolytes because of a reduced amount of volatiles and flammables. The polymer membrane can condnct lithinm ions. The polymer membrane acts as both the separator and electrolyte [7],... 

Lipophilic Hydrophilic Conpling agents Polysilanes Polyphosphazenes Phosphonitrilic flnoroelastomer Engineering resin High-performance plastics... 

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