Fluorosilicone polymers

The high values for the trifiuoropropyl group are surprising but correspond with the liquid surface tension of polytrifluoropropylmethylsiloxane [13], although not in line with its critical surface tension and solid surface tension. The low values for the longer fluoroalkyl groups are comparable to the lowest surface tension fluoropolymers and correspond well with the values for related preformed fluorosilicone polymers [14-15]. 

Another class of functional siloxane polymer that has received some attention are the fluorosiloxane materials, especially 3,3,3-trifluoropropylmethylsiloxanes. The use of conventional equilibration catalysts to produce these materials gives products which favour the cyclosiloxane in the bulk. Clarson and coworkers41 report the use of specific condensation catalysts such as stannous octanoate, potassium carbonate and barium hydroxide to prepare hydroxy terminated fluorosilicone polymers. 

Fluorosilicone polymers can be cross-linked by ultraviolet radiation or by electron beam, but these methods are not commonly used69... 

Figure 3. Reduced temperature nomograph for a fluorosilicone polymer. Data taken by both resonant beam and DMA instruments. Key upper curve, modulus and lower curve, loss tangent.

Fluorosilicones Polymers with chains of alternating silicon and oxygen atoms and trifluoropropyl pendant groups. Most are rubbers. 

Uses Intermediate for fluorochemicals, fluorosilicone polymers, and agricultural chemicals... 

Conrad, M. P. C. Shoichet, M. S., Synthesis and Thermal Stability of Hybrid Fluorosilicone Polymers. Polymer 2007,48, 5233-5240. 

Luo et al. [6] used a polydimethylsiloxane macro-initiator to initiate polymerization of methacrylate monomers with fluorinated side groups to prepare fluorosilicone polymers. To obtain diblock copolymers with a low surface energy, they designed poly(dimethylsiloxane)-block-poly(2,2,3,3,4,4,4-heptafluorobutyl methacrylate) (PDMS-1 -PHFBMA) diblock copolymers by atom transfer radical polymerization (ATRP) technique. To initiate 2,2,3,3,4,4, 4-heptafluorobutyl methacrylate polymerization, bromine end-capped polydimethylsiloxane (PDMS-Br) was used as the macro-initiator. Scheme 6.5 shows a schematic representation of the PDMS-fc-PHFBMA diblock copolymers. The system was strictly deoxygenated... 

To prepare fluorosilicone polymers, Luo et al. [7] again used a polydimethylsiloxane macro-initiator to initiate polymerization of methacrylate monomers with fluorinated side groups. A poly(dimethy lsiloxane)-block-poly(methylmethacrylate)-block-... 

Kim et al. [40] synthesized a fluorosilicone polymer with a hydrocarbon backbone and fluorinated and siloxane pendant groups covalently bound by urethane. The structure of urethane graft-co-(septadecafluorodecylacrylate)-[tra(trimethyl... 

Thermal polymerization of these monomers produces new types of fluorosilicone polymers which are just now being explored. The Grignard reagent has... 

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