PFCB aryl ethers

Condensation of aryl TFVE dimethylchlorosilane via dehydrogenerative hydrolysis/methanolysis yielded a siloxane containing aryl TFVE monomer for the preparation of PFCB aryl ether fluorosilicones [99], Rizzo et al. prepared two disilanol monomers containing perfluorocyclobutane rings, l,2-bis[4-(dimethylhydroxysilyl)phenoxy]-1,2,3,3,4,4-hexalluo-rocyclobutane and l,2-fiw[3-(dimethylhydroxysilyl)... 

A variety of PFCB aryl ether polymers with a combination of good chemical and thermal stability, controllable refractive index, low birefringence, and low... 

FIGURE 14.8 Design motif of high performance PFCB aryl ether polymers for processability, versatility, and performance. 

Jin, J. Y. Studies on Perfluorocyclobutyl (PFCB)Aryl Ether Polymers From Fundamentals to Function. Clemson University, 2005. 

Verma, R.,Tomar, N., Creager, S.E., Smith Jr., D.W., 2012. Statically non-wetting electros-pun perfluorocyclobutyl (pfcb) aryl ether polymer doped with room temperatiu-e ionic liquid (rtil). Polymer 53. 

Cyclodimerization of fluorinated alkenes was observed as early as 1947 during the pyrolysis study of polytetrafluoroethylene (PTFE) [54]. The ability of fluorinated alkenes to dimerize with themselves has been attributed to the energy relief of fluorinated double bond strain [4]. In the same fashion, the aryl trifluorovinyl ether groups (Ar—O—CF=Cp2) underwent thermally activated [2-1-2] cycloaddition to form bisaryloxy-substituted PFCB rings. Scheme 14.9 depicts the model reaction of cycloaddition of aryl trifluorovinyl ethers. The thermal cyclodimerization of methyl... 

In this chapter, various synthesis routes for trifluorovinyl aromatic ethers are discussed. PFCB polymers are prepared via thermally activated [2+2] cycloaddition of aryl trifluorovinyl ether monomers. The cyclodimerizaton proceeds in a stereorandom fashion giving a roughly equal distribution of cis- and trans- stereoisomers. The PFCB technology can serve as a versatile materials platform for many industrial... 

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