Miscellaneous fluorine containing chain-growth polymers

6 Miscellaneous Fluorine Containing Chain-Growth Polymers 

One of the miscellaneous fluoroolefin polymers is a copolymer of trifluoronitrosomethane and tetrafluoroethylene [287], an elastomer  

It can be formed by suspension polymerization. One procedure is to cany out the reaction in an aqueous solution of lithium bromide at — 25 C with magnesium carbrniate as the suspending agent. No initiator is added and the reaction takes about 20 h. Because the reaction in inhibited by hydroquinmie and accelerated by ultra-violet light, it is believed to take place by a free-radical mechanism. Whether it is chain-growth polymerization, however, is not certain. A 1 1 copolymer is always formed regardless of the composition of the monomer feed, and the copolymerization takes place only at low temperatures. At elevated temperatures, however, cyclic oxazetidines form instead  

Two polyfluoroacrylates are manufactured on a small commercial scale for some special uses in jet engines. These are poly(l,l-dihyroperfluorobutyl acrylate)  

The polymers are prepared by emulsion polymerization with persulfate initiators. 

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See also in sourсe #XX -- [ ]

See also in sourсe #XX -- [ ]

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