Polyhedral oligomeric silsesquioxane polymers

Govindaraj B, Sarojadevi M. Synthesis and characterization of poly (imide-benzimidazole) hybrid nanocomposites using nano-cluster of octa-amino functionalized polyhedral oligomeric silsesquioxane. Polym Compos 2013 34(6) 825-33. 

Yang, D., Zhang, W., Yao, R., Jiang, B. Thermal stability enhancement mechanism of poly (dimethylsiloxane) composite by incorporating octavinyl polyhedral oligomeric silsesquioxanes. Polym. Degrad. Stab. 98, 109-114 (2013)... 

Haddad, T.S. Lichtenhan, J.D. Hybrid organic-inorganic thermoplastics styiyl-based polyhedral oligomeric silsesquioxane polymers. Macromolecules 1996, 29, 7302-7304. 

Chen J-H, Yao B-X, Su W-B, Yang Y-B (2007) Isothermal ciystallizatirai behavior of isotactic polypropylene blended with small loading of polyhedral oligomeric silsesquioxane. Polymer 48(6) 1756-1769. doi 10.1016/j.polymer.2007.01.010... 

PDMS nanocomposites with layered mica-type silicates were also reported.374 A two-step sol-gel process of the in situ precipitation of silica led to the development of siloxane-based nanocomposites with particularly high transparencies.3 5 Some unusual nanocomposites prepared by threading polymer chains through zeolites, mesoporous silica, or silica nanotubes were reviewed.3 6 Poly(4-vinylpyridine) nanocross-linked by octa(propylglycidyl ether) polyhedral oligomeric silsesquioxane was reported.377... 

Carroll JB, Waddon AJ, Nakade H, Rotello VM. Plug and play polymers. Thermal and X-ray characterizations of noncovalently grafted polyhedral oligomeric silsesquioxane (POSS)-polystyrene nanocomposites. Macromolecules 2003 36 6289-6291. 

Pielichowski, K., Njuguna, J., Janowski, B. and Pielichowski, J. Polyhedral Oligomeric Silsesquioxanes (POSS)-Containing Nanohybrid Polymers. Vol. 201, pp. 225-296. 

Bourbigot, S., Turf, T., Bellayer, S., and Duquesne, S., 2009. Polyhedral oligomeric silsesquioxane as flame retardant for thermoplastic polyurethane. Polym. Deg. Stab. 94 1230-1237. 

Joshi, M. and Butola, B. S., Polymeric nanocomposites—polyhedral oligomeric silsesquioxanes (POSS) as hybrid nanofiller, J. Macromol. Sci., Polym. Rev. (2004), C44, 389M10. 

Bourbigot, S., Le Bras, M., Flambard, X., Rochery, M., Devaux, E., and Lichtenhan, J. 2005. Polyhedral oligomeric silsesquioxanes Application to flame retardant textiles. Fire Retardancy of Polymers New Applications of Mineral Fillers, Le Bras, M., Bourbigot, S., Duquesne, S., Jama, C., and Wilkie, C.A. (Eds.), Royal Society of Chemistry (Pub), U.K., pp. 189-201. 

Schwab J J, Lichtenhan J D. (1998) Polyhedral oligomeric silsesquioxane (POSS)-based polymers. Appl Organomet Chem 12 707-713. 

Polyhedral oligomeric silsesquioxanes (POSS) are known molecules having various structures [1] as seen in Fig. 1. However double-decker shaped silsesquioxane has not been obtained. POSS is an interesting class of monomers for the preparation of silicon-based polymers. In recent years, silsesquioxane-based polymers have received much attention because of their useful properties, which include heat resistance, mechanical stability, low dielectric constant, etc. [2, 3],... 

Polyhedral Oligomeric Silsesquioxanes (POSS)-Containing Nanohybrid Polymers... 

Perfluoroalkyl groups are also introduced into block copolymers with methacrylates, acrylates, and styrene (B-46 to B-53), which can be synthesized in scCC>2 or in the bulk.95,315 Amphiphilic block copolymers based on glycopolymer segments (B-54 and B-55) are synthesized by copper-catalyzed polymerizations.321,322 Comonomers with a polyhedral oligomeric silsesquioxane unit afforded hybrid polymers between organic and inorganic components (B-56 and B-57).326... 

Polyhedral oligomeric silsesquioxane (POSS) has been described as a three-dimensional "cage-shaped molecule composed of a silicon-oxygen framework bonded to organic groups that make it compatible with a polymer matrix. Unlike conventional nanofillers that must be dispersed and exfoliated to be useful, POSS molecules formulated in the resin are induced by shear to "self-assemble ... 

Broadband dielectric spectroscopy is a powerful tool to investigate polymeric systems (see [38]) including polymer-based nanocomposites with different nanofillers like silica [39], polyhedral oligomeric silsesquioxane (POSS) [40-42], and layered silica systems [43-47] just to mention a few. Recently, this method was applied to study the behavior of nanocomposites based on polyethylene and Al-Mg LDH (AlMg-LDH) [48]. The properties of nanocomposites are related to the small size of the filler and its dispersion on the nanometer scale. Besides this, the interfacial area between the nanoparticles and the matrix is crucial for the properties of nanocomposites. Because of the high surface-to-volume ratio of the nanoparticles, the volume fraction of the interfacial area is high. For polyolefin systems, this interfacial area might be accessible by dielectric spectroscopy because polyolefins are nonpolar and, therefore, the polymeric matrix is dielectrically invisible [48]. 

All of the chapters of the first edition were updated and 11 entirely new chapters added. Four of them focus on novel polymeric structures, specifically dendrimers, polyrotaxanes, foldamers, and supramolecular polymers in general. Another group of chapters covers reinforcing phases in polymers, including carbon black, silica, clays, polyhedral oligomeric silsesquioxanes (POSS), carbon nanotubes, and relevant theories. The final new chapter describes experiments on single polymer chains. 

FIGURE 34.2. Some of the functionalities that can be prepared from POSS-trisilanol precursors [1]. (Applied Organometallic Chemistry, 12, Schwab, J. J. and Lichtenhan, J. D., Polyhedral Oligomeric Silsesquioxane (POSS)-based Polymers, pp. 707-713, Copyright (1998), John Wiley and Sons Ltd., New York. Reproduced with permission.)... 

Zhang, Y., Lee, S., Yoonessi, M., Liang, K., Pittman, C.U. Phenolic resin-trisilanolphenyl polyhedral oligomeric silsesquioxane (POSS) hybrid nanocomposites structure and properties. Polymer 47, 2984-2996 (2006)... 

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