Fluorine-Containing Aromatic Polymers

The thermal stability of these polymers in vacuum is about equivalent to polytetrafluoroethy- 

Among other fluorine-containing materials reported in the literature are a group of polyesters 

Their heat stability and other physical properties, however, do not appear to be superior to conventional materials. The Ullmann reaction can be used to prepare polyperfluorophenylene. The products, however, are low in molecular weight  

Higher molecular weight materials, like poly(perfluorophenylene ether) form from potassium pentafluorophenoxide, where Mn is about 12,500  

low molecular weight fluorine-containing polymers form from peifluoroaromatic compounds through a loss of aromaticity when they react with bis(fluoroxy)difluoromethane. More interesting is the formation of poly(a,a,a, a -tetrafluoro-/7-xylylene) by a polymerization technique that closely resembles the preparation of poly(p-xylylene) by vacuum pyrolysis of a dimer  

Liu et al. reported improved process for synthesizing fluorinated polymers in supercritical carbon dioxide [177]. The improvement consisted of modifying the reaction system and designing and using sampling tubes. 

---

Synthesis and Properties of Fluorine-Containing Aromatic Condensation Polymers Obtained from Bisphenol AF and Its Derivatives... 

Fluorine-Containing Aromatic Diamines - Monomers for High Performance Polymers ... 

S. Maji, S. Banerjee, Synthesis, characterization, and properties of novel fluorine containing aromatic polyamides, J. Appl. Polym. Sci. 108 (2)(2008) 1356-1364. 

Huoroelastomers are fluorine containing hydrocarbon polymers manufactured under various tradenames such as Viton by DuPont, Technoflon by Ausimont, and Fluorel by 3M. The fluoroelastomers provide excellent resistance to oils, fuels, lubricants, most mineral acids, many aliphatic and aromatic hydrocarbons (carbon tetrachloride, benzene, toluene, xylene) that act as solvents for rubbers, gasoline, naphtha, chlorinated solvents, and pesticides. 

Given that the absorption phenomenon at EUV is atomic, almost every element is opaque at EUV (see Eig. 14.22) except thin films of polymers with high carbon content (as in aromatic polymers based on PHOST) and silicon (see Fig. 14.23). Polymers containing high amounts of oxygen and fluorine have very high absorptivity at EUV (see Fig. 14.23). 

The fluorine-containing polymers for materials with complete internal light-reflection are reviewed. The general kinetic control features for the synthesis of block polymerisation fluoroalkylmethacrylates (FMA), their copolymerisation with different vinyl monomers, their relative activity and the polymerisation of FMA in presence of nitroxyl radicals are discussed. The basic properties of the more frequently used FMA for materials with complete internal light-reflection, are characterised. The new optical transparent fluorine polymers, also containing per-fluorinated cyclobutane and aromatic fragments are reviewed. Data from the literature and original results are presented. 

---