Polysiloxanes polyester block

The new materials are block copol3miers of PEDOT and a flexible pol5nner such as polyethers, polysiloxanes, polyesters, or polyaciylates. 

Polyether-polyester polyol hybrids, 25 472 Polyetherimide-polysiloxane block copolymers, 24 698, 704, 708... 

S—EB—S (compounds) polyurethane/elastomer block copolymers polyester/elastomer block copolymers polyamide/elastomer block copolymers polyetherimide/polysiloxane block copolymers polypropylene/EPDM or EPR blends polypropylene/EPDM dynamic vulcanizates polypropylene/butyl rubber dynamic vulcanizates polypropylene/natural rubber dynamic vulcanizates polypropylene/nitrile rubber dynamic vulcanizates PVC/ nitrile rubber blends... 

For webs, the substrate electrode is usually a vapor-deposited, semitransparent metal layer (Ritchie and Fenn, 1987 Chen, 1993). Al, Ni, and Cr are commonly used. The use of semi-transparent electrodes permits the use of rear exposures for erase purposes. In the case of drums, the metal cylinder serves as the electrode. Usually, a thin, less than 1 pm, blocking layer is interposed between the electrode and the photoreceptor to prevent charge injection. This layer must not be so thick that a residual potential builds up during cycling. Many insulating polymers have been used acrylic polymers, epoxy resins, polyamides, polyesters, polyphosphazenes, polysiloxanes, polyurethanes, vinyl polymers, etc. 

Besides the thermoplastic elastomers based on poly(styrene-6-elastomer- -styrene) block copolymers, five others are of commercial importance polyurethane/elastomer block copolymers, polyester/elastomer block copolymers, polyamide/elastomer block copolymers, polyolefin block copolymers, and polyetherimide/polysiloxane block copolymers. All five have the multiblock A-B-A-B. structure. The morphology of the polyurethane, polyester,... 

Another synthetic strategy is the transformation of ring-opening polymerization to controlled radical polymerization. The transformation of the active site from one to the other can be performed in the polymerization system or after separation and purification. The active sites can be obtained by reacting functionalized polymer with appropriate reagents. Various block copolymers containing polyether (or polyester, or polysiloxane or polyacetal) blocks and vinyl polymer blocks have been prepared by this method. 

The maleic anhydride polymers have been further reacted with epoxides to give epoxide-functionalized PPO that can react with polyesters and give graft copolymers useful for compatibilization of PPO with the polyesters.Reaction of PPO with graftable ortho esters in the melt gives graft polymers that are useful as compatibilizers of PPO with polyesters. The modified PPO has also been reacted with amino-terminated polysiloxanes to produce block copolymers. ... 

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