Fluorinated polyisoprene

Finally, the poor solubility of fluorinated polyolefins can also be exemplified by the phase behavior of fluorinated polyisoprenes and polybutadienes in SC-CO2 (see Figure 13.3) [18], A pressure of 1000 bar and a temperature of 60°C were thus... 

FIGURE 13.3 Molecular structures of (a) fluorinated polyisoprene and (b) fluorinated polybutadiene. 

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The formation of coagulum is observed in all types of emulsion polymers (i) synthetic rubber latexes such as butadiene-styrene, acrylonitrile-butadiene, and butadiene-styrene-vinyl pyridine copolymers as well as polybutadiene, polychloroprene, and polyisoprene (ii) coatings latexes such as styrene-butadiene, acrylate ester, vinyl acetate, vinyl chloride, and ethylene copolymers (iii) plastisol resins such as polyvinyl chloride (iv) specialty latexes such as polyethylene, polytetrafluoroethylene, and other fluorinated polymers (v) inverse latexes of polyacrylamide and other water-soluble polymers prepared by inverse emulsion polymerization. There are no major latex classes produced by emulsion polymerization that are completely free of coagulum formation during or after polymerization. 

Since the early stages of their development, a wide range of rubbers has been used as dielectric elastomers. The most commonly used elastomers belong to the silicone, polyurethane, and acrylic families. Other elastomers, such as polyisoprenes, fluorinated elastomers,... 

As of steric effects the unsubstituted cyclopentadienyl compound is more active than the substituted ones. The fluorinated compounds are much more active (up to a factor of 30) than the chlorinated ones. The glass transition temperature of the polyisoprenes is about —52°C. 

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