Poly aryl ether thianthrene s

The poly(aryl ether thianthrene)s are flame resistant and exhibit a high refractive index of 1.61-1.70, depending on the wavelength and the corresponding bisphenol. For this reason, the polymers are interesting for optical applications. 

PPS is a semi-crystalline material. It exhibits an excellent balance of properties, including high-temperature resistance, chemical resistance, flowa-bility, dimensional stability, and electrical characteristics. PPS is brittle. Therefore, it must be filled with fibers and fillers. 

Because of its low melt viscosity, PPS can be molded with high loadings of fillers or reinforcing materials. The fillers and reinforcing materials enhance the strength, dimensional stability, and other properties. PPS exhibits flame retardancy and thus is ideal for high-temperature electrical applications. 

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Difluorothianthrene, i.e., 2,7-difluoro-9,10-dithiaanthracene, c.f. Figure 5.8, is a monomer for poly(aryl ether thianthrene)s. This monomer is a high melting crystalline solid that sublimes under reduced pressure, simplifying the purification for polymer S5mthesis. It can be condensed with a bisphenol to yield poly(aryl ether thianthrene)s. ... 

J. B. Edson and D. M. Knauss. Thianthrene as an activating group for the synthesis of poly(aryl ether thianthrene)s by nucleophilic aromatic substitution. J. Polym. Set, Part A Polym. Chem., 42(24) 6353-6363, December 2004. 

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