Fluorinated PAE

Ethynyl terminated fluorinated PAES has a potential use for optical waveguide applications. The synthesis of ethynyl terminated fluorinated PAES is shown in Figure 7.12. The polymer is cured at 270°C for 2 h. 

A bisphenol monomer, 2,2 -dimethylaminemethy-lene-4,4 -biphenol has been prepared by the Mannich reaction of dimethylamine and formaldehyde with 4,4 -biphenol. This monomer can be used for the synthesis of partially fluorinated PAES polymers with pendant quaternary anunonium groups. The synthesis is shown in Figure 7.2. 

Quatemized PAES with up to two pendant quaternary ammonium groups have been prepared by a cesium carbonate mediated direct aromatic nucleophihc subshtuhon polycondensahon of 2,2 -dimethylaminemethylene-4,4 -biphenol, 4,4 -biphenol, and 4,4 -difluorodiphenyl sulfone, followed by the reaction with iodomethane [96]. These types of ionomers are more stable than some fluorinated PAES ionomers under highly basic conditions. 

Fluorinated PAEs with Terphenyl, Pyridinylidene, Thiophenylidene,... 

Fluorinated PAEs with Anthracene and Fluorene Moieties... 

Fluorinated PAEs with Naphthyl and Naphthyl-lmido Moiety... 

Ueda et al. [63] synthesized a fluorinated PAE containing naphthalene moiety and investigated its properties. The polymer was synthesized by catalytic oxidative coupling polymerization using FeCls (Scheme 2.13). The polymer had an Mn of 32,000g/ mol with good film processability. The polymer had a Tg value of 230 °C and was recorded at 530 °C. 

Fluorinated PAEs with Cardo Cyclohexylidene Moiety... 

Fluorinated PAEs with Phenyl Phosphine Oxide Moiety... 

Kim and coworkers [137] prepared sulfonated fluorinated PAEs containing naphthalene moieties in the main chain (SPAE-XX, where XX = 20,30,40,50,60, 70, and 80) with DS=0.2, 0.3, 0.4, 0.5, 0.6, 0.7, and 0.8. The sulfonic acid groups were a bonded meta- to et/ier-linkage of a naphthalene ring in the polymer. The -CF3 groups were introduced into the polymer structure by using 6F-BPA units that controlled the sulfonic acid content in the copolymer composition. 

---