Functionalized polyhedral oligosilsesquioxane (POSS) macromers: new graftable POSS hydride, POSS α-olefin, POSS epoxy, and POSS chlorosilane macromers and POSS–siloxane triblocks

✍ Scribed by Edward G. Shockey; Alan G. Bolf; Paul F. Jones; Joseph J. Schwab; Kevin P. Chaffee; Timothy S. Haddad; Joseph D. Lichtenhan

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 183 KB
• Volume: 13
• Category: Article
• ISSN: 0268-2605
• DOI: 10.1002/(sici)1099-0739(199904)13:4<311::aid-aoc847>3.0.co;2-1

✦ Synopsis

A series of polyhedral oligomeric silsesquioxanes (POSS) monomers bearing silane or a-olefin substituents have been prepared and their chemistry explored. Both the POSS silanes and a-olefin monomers readily participate in hydrosilation chemistry and have been used as starting materials for the preparation of POSS sol-geltype reagents. Similarly, POSS silanes and aolefins are reactive towards silane-and olefinfunctionalized polymers, which makes them useful as grafting reagents. The utility of these reagents as graftable monomers was demonstrated by synthesis of a series of POSSsiloxane-POSS triblock polymers. Thermal and X-ray diffraction (XRD) characterization of the triblock polymers was performed in order to examine how the length of the siloxane segment affects the properties of the polymer. The POSS a-olefin monomers were found to be unreactive with respect to Ziegler-Natta polymerization. The reaction of POSS a-olefins with m-chloroperbenzoic acid (MCPBA) to give POSS epoxides was demonstrated and the thermal stability of the POSS epoxides deter-mined.