Methacrylates fluorine-oxygen containing

Table 8.8 Copolymerisation constants and activity factors at copolymerisation of fluorine-oxygen containing methacrylates (MJ with MMA (M2) [73] ...

Various polymeric materials were tested statically with both gaseous and liquefied mixtures of fluorine and oxygen containing from 50 to 100% of the former. The materials which burned or reacted violently were phenol-formaldehyde resins (Bakelite) polyacrylonitrile-butadiene (Buna N) polyamides (Nylon) polychloroprene (Neoprene) polyethylene polytriflu-oropropylmethylsiloxane (LS63) polyvinyl chloride-vinyl acetate (Tygan) polyvinylidene fluoride-hexafluoropropylene (Viton) polyurethane foam. Under dynamic conditions of flow and pressure, the more resistant materials which binned were chlorinated polyethylenes, polymethyl methacrylate (Perspex) polytetraflu-oroethylene (Teflon). 

The aluminium samples modified by methacrylate copolymer films were investigated by XPS to obtain their chemical surface composition. Besides the elements of the copolymer film (carbon, fluorine) also the elements of the oxidic substrate material (aluminium and sulphur) were detected. The detection of alumiiuum indicates a very thin copolymer layer or a ruptured copolymer film, which did not fully cover the substrate material. Traces of sulphur (found as sulphate S04 ) were incorporated during the anodization process. Both layers contained oxygen, but it was less in the polymer film than in the oxide layer. To calculate the degree of coverage, 4> the relative atomic concentration (at%) of carbon (the key element of the polymer layer) was related to the sum of the relative atomic concentrations of carbon and aluminium (the key element of the substrate material) ... 

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