Inorganic and Organometallic Polymers II: Advanced Materials by Patty Wisian-Neilson, Harry R. Allcock, Kenneth J. Wynne

By Patty Wisian-Neilson, Harry R. Allcock, Kenneth J. Wynne

Experiences contemporary advances in inorganic and organometallic polymers, together with new polymerization procedures, new polymer structures and lots of strong point purposes. Discusses thermal, electric, optical, floor, and organic houses of many structures and offers functions as face up to fabrics, fuel permeable membranes, hot temperature thermosets, corrosion resistant coatings, and ceramic precursors. reports new artificial routes to and amendment of polyphosphazenes, polysilanes, and sol-gel hybrids. experiences on novel inorganic polymers such as sulfur-nitrogen, metallocene-silane, and boron-carbon backbones. Examines structure-property relationships of many structures together with polyphosphazenes and heterometallic oxopolymers similar to the aluminoxanes.

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If this mixture is allowed to stand in hexane at sub-ambient temperatures one of the isomers, either la or lb, precipitates out of the solution in « 95% purity. This compound givesriseto the single peak shown in Figure lb. Preliminary Assignments The compound, which can be purified to 95%, has previously been assigned to isomer la, based on intuitive arguments. Because isomer la has an all-trans configuration of substituents it can adopt a preferred conformation where all four phenylringsoccupy pseudo-equatorial positions and the four methyl groups are in pseudo-axial positions.

Ch005 44 INORGANIC AND ORGANOMETALLIC POLYMERS II may introduce unwanted contamination, such as oxygen, into the final ceramic article. Irradiation techniques are also difficult to incorporate into traditional ceramic processing. While it might be feasible to irradiate a spun fiber, any bulk, molded article, such as an injection molded silicon nitride turbocharger rotor, could not be readily cured with such an exposure. Thermal addition and catalytic crosslinking have proven especially effective for rendering vinyl-substituted precursors infusible and this technology can be translated to the fabrication of ceramic parts.

Hirata, H . ; Sakurai, H. J. Am. Chem. Soc. 1989, 111, 7641 . 6. ; Gupta, Y . ; Cypryk, M. J. Am. Chem. Soc. 1991, 113, 1046 . 7. ; Gordon-Wylie, S. ; Matyjaszewski, K . Organometallics, in press. 8. ; Organometallics 1992, 11, 3257. 9. ; West, R. Organometallics 1991, 10, 660. 10. Lipshutz, Β. H. Synthesis 1987, 4, 325 . 11. ; Oehlschlager, A . Tetrahedron 1989,45, 557. ; ACS Symposium Series; American Chemical Society: Washington, DC, 1994. Chapter 5 Polysilazane Thermosets as Precursors for Silicon Carbide and Silicon Nitride 1 2 J.

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