Polyurethanes, fluorinated elastomers

During the last two decades, many special fluoropolymers have been developed, such as fluorosilicones fluorinated polyurethanes fluorinated thermoplastic elastomers new, second-generation polymers and copolymers based on PTEE amorphous... 

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,... 

The serendipitous discovery of polytetrafluoroethylene (PTFE) in 1938 by Roy J. Plunkett [82] and his co-workers at DuPont research laboratories has spurred the development of a variety of fluorine containing polymers, which include fluorosilicones, fluorinated polyurethanes, fluorinated thermoplastic elastomers, etc.. Many of the commercial fluoropolymers are suitable for melt processing via conventional injection molding, screw extrusion and blown film extrusion techniques. 

The following fluoropolymers are commercially available in aqueous systems PTFE, PFA, MFA, FEP, ETFE, PVDF, THV Fluoroplastic, fluorocarbon elastomers, fluoroacrylates, and fluorinated polyurethanes. 

Elastomers based on fluorinated polyurethanes exhibit good mechanical properties and resistance to solvents, chemicals, cold, and heat.54 Formulations for fluoroure-thane elastomers are frequently modified with siloxanes to optimize certain properties.55 FEVE-based polyols are used to manufacture elastomeric automobile bumpers and interior trim components.56... 

Property Fluorinated ydrocarbon T etrafluoro-ethylene/ propylene copolymer Fluorosillcone Perfiuoro- elastomer Polyurethane Poly- chloroprene Chloro- sulfonated polyethylene Ethylene/ propylene copolymer... 

A series of these rubbers possess polar groups consequently, the corresponding elastomers do not swell in oil. Polyurethane rubbers and polysulfide rubbers, as well as the already mentioned nitrile and chloroprene rubbers (Table 37-5), belong to the good oil-resisting rubbers. Moderate oil resistance with simultaneously improved heat resistance is shown by chlorosulfonated ethylene, acrylic, silicone, and fluorine rubbers. 

In the following data acquisition, the same 163 standard polymer samples used in the former edition were adopted as a set of representative ones utilized in versatile fields, which include representative synthetic polymers [a) polyolefins (homopolymers) (001— 007), b) vinyl polymers with ethylene units (copolymers) (008—015), c) vinyl polymers with styrene units (016—028), d) vinyl polymers with styrene derivatives (029—035), e) acrylate-type polymers (036—049), f) chlorine-containing vinyl polymers (050-059), g) fluorine-containing vinyl polymen (060—066), h) the other vinyl polymers (067—070), i) diene-type elastomers (071—081), j) polyamides (082-090), k) polyacetals and polyethers (091—095), 1) thermosetting polymers (096—106), m) polyimides and polyamide-type engineering plastics (107—114), n) polyesters (115—126), o) the other engineering plastics with phenylene skeletons (127—138), p) sificone polymers (139—143), and q) polyurethanes (144—147)] along with some natural polymers [r) cellulose-type polymers (148-155) and s) the other some natural polymers (156-163)]. 

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