Photopolymerization, fluorinated

Bongiovanni, et al., reported syntheses of fluorinated vinyl ethers (H2C==CHOCH2CH2CnF2ttfi, (n-6 or 8) and their eopolymerization with bis(4-vinyloxybutyl) isophthalate. When added in low eoneentrations (0.1-3.0 wt %) to formulations containing bis(4-vinyloxybutyl) isophthalate, they did not affeet the kinetics of the eationic photopolymerization. The eured films were transparent and showed interesting properties in terms of wettabihty, hardness, eross-eut adhesion, and ehemieal inertness. The fluoro-monomers increased the hydrophobieity of the film surface, whereas the adhesion on various substrates such as glass and wood was unchanged. An increase in the methyl ethyl ketone resistance was also observed. 

To the more usual homolytic fragmentation of aryl halides (from the excited state or from the radical anion, the well known SrnI reaction, for a recent example see the arylation of aromatics), the heterolytic version of the reaction which produces phenyl cations has more recently joined. A theroretic study on the photodissociation of fluorinated iodobenzenes has been published. The perfluoroallgrlation of various alkenes has been obtained by irradiation in the presence of iodoperfluorobutane. The formation of phenyl cations is exemplified in many arylation reactions and, in the case of o-chlorostannane, also a benzyne has been reported. In the field of polymer chemistry, iodonium salts are model cationic photoinitiators. In particular the truxene-acridine/diphenyl iodonium salt/9-vinylcarbazole combination is able to promote the ringopening polymerization of an epoxide, whereas the truxene AD/allq l halide/amine system is very efficient in initiating the radical photopolymerization of an acrylate. ... 

New Developments in Cationic Photopolymerization Process and Properties 141 O A monofuncitonal fluorinated epoxide synthesized on pourpose (FOX) [34]... 

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