Segment copolymers

Segmented copolymers can also be prepared by polymerization in the presence of appropriate cyclic trithiocarbonates as RAFF agents.661... [Pg.548]

By using diamide units, melt phasing can be avoided and at the same time the crystallization rate is rapid. Surprisingly, diese segmented copolymers widi diamide units not only crystallize quickly but also have a high fracture strain... [Pg.148]

Example 25. Diamide-poly (tetramethylene oxide) segmented copolymer... [Pg.192]

Polyether-PA segmented copolymers, synthesizing, 191-192 Polyether polyols, 200, 205, 211-212 synthesis of, 223, 224 Poly(ether sulfone) (PES), 327. See also Poly(arylene ether sulfone)s Poly(phenylene ether sulfone) chains Sulfonated poly (ary lene ether sulfone)... [Pg.596]

Recently, as a further recognition of the importance of multiphase copolymers in specialty applications, siloxane containing block and segmented copolymers have received special attention for applications such as biomaterials, photoresists, gas separation membranes, protective coatings, elastomers and emulsifiers, as we shall... [Pg.27]

The first example of siloxane-urea segmented copolymers were prepared by the direct reaction of aminopropyl-terminated polydimethyl siloxane oligomers and MDI (4,4 -diphenylmethane diisocyanate), in solution at room temperature as shown in the Reaction Scheme XI. [Pg.31]

Synthesis of MDI Based Siloxane-Urea Segmented Copolymers 157)... [Pg.31]

Table 14. Synthesis and characteristics of siloxane-urea segmented copolymers based on MDI and aminopropyl terminated PDMS oligomers 1571...

Preparation of siloxane-carbonate segmented copolymers by interfacial polymerization involves the reaction of carboxypropyl-terminated siloxane oligomers with bisphenol-A and phosgene, in the presence of a strong base and a phase transfer catalyst, in water/methylene chloride solvent system l50 192), as shown in Reaction Scheme XIV. [Pg.37]

Synthesis of Poly(Aryl Ester)-Polysiloxane Segmented Copolymers 117)... [Pg.38]

Poly(unsaturated ester)-siloxane segmented copolymers have been prepared by the polycondensation of epoxy-terminated polydimethylsiloxanes and carboxy-terminated poly(ethylene adipate-co-maleate) oligomers 243). Reactions have been conducted in cellosolve solvent, at 140-150 °C, in the presence of 2% by weight potassium hydroxide catalyst. The molecular weights reported were fairly low. The same group has also prepared poly(hexamethylene adipate)-polydimethylsiloxane copolymers con-... [Pg.39]

Table 17. Structure of the hard segments in poly(Aryl ether)-polydimethylsiloxane segmented copolymers...

Polybutadiene-polydimethylsiloxane segmented copolymers were prepared by the reaction of epoxy-terminated PDMS and carboxy-terminated polybutadienes, in refluxing toluene under catalytic action of potassium hydroxide 243). Molecular weights of the copolymers obtained were usually in the low range. No other characterization data were available. [Pg.45]

Siloxane Containing Graft and Segmented Copolymers by Free-Radical Copolymerization... [Pg.54]

Big Chemical Encyclopedia