Processing epoxy-polyurethane blends

Other studies have focused on poly(dimethylsiloxane) blended with polycarbonates, ° polyisobutylene, poly(ethylene oxide), polyurethanes, epoxies,benzoxazines, and poly(hexylthiophene). ° In some cases, a polysiloxane oil was blended into polypropylene to facilitate its processing. A variety of other siloxane materials have been employed—for example, poly(diethylsiloxane), polyurethanes, fiuori-nated siloxane copoymers and fluororubbers in general, and trimethyl-siloxy silicates. ... 

These characteristics make the planetary gear extruders well suited for processing heat-sensitive materials such as rigid and flexible PVC. They are also used to process blends (eg, PVC and ABS), plastic foams, powder coatings, epoxy, polyester, acrylic, polyurethane, chlorinated polyethylene, etc. 

This section will cover polymer blends containing thermosetting polymers as at least one of the constituents. Crosslinked elastomers will not be discussed in this section, as they are covered in Section 4.2. Specific thermosetting polymers include epoxies, phenolics, unsaturated polyesters, bismaleimides, vinyl esters, cyanate esters and polyurethanes, which are the major commercial thermoset polymers. Preparation of thermoset polymer blends comprised of thermoset/thermoset or thermoset/thermoplastic combinations will require in-situ polymerization as melt processing of thermosetting polymers is not possible. The in-situ polymerization procedure can include ... 

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