Synthesis and properties of hyperbranched polymers by polymerization of an AB3-type incompletely condensed cage silsesquioxane (IC-POSS) monomer

Alkenyl-Functionalized Open-Cage Silsesquioxanes (RSiMe2O)3R′7Si7O9: A Novel Class of Building Nanoblocks

“…9,11,34−36 They have been used as effective emulsifiers for the synthesis of stable oil-in-water emulsions, 9 nanofillers for tuning properties of optically transparent polymer materials, stabilizers of a quantum dot (binding ligand in nanocrystalline electroluminescent materials), 42 cross-linking agents in binders, hot-melt adhesives, 43 insoluble Langmuir films, 44 and monomers in the synthesis of hightemperature resistance polymers. 34,35 They were also employed in the manufacture of liquid-crystal displays, 45 photosensitive materials, 46−48 All of the above-mentioned studies have concern for the use of trifunctional IC-POSSs obtained only by the hydrosilylation of carbon−carbon double bond (CC), in which the research was focused on the uses of the desired products, and in most cases, no optimization of the reaction conditions was made. Therefore, there is still a great need for developing the synthetic approaches leading to new compounds, which will open areas of research not available so far.…”

“…) − or by the controlled cleavage of R 8 Si 8 O 12 . − The (HO) 3 R′ 7 Si 7 O 9 have been used as models for the silica surfaces, ,, dispersants in polymer matrixes, − reactive additives (which improve the moduli and thermal stability of composites), − components for the preparation of noncrystalline poly­(silsesquioxane)­s, as well as in biomedical studies focused on the tissue healing . However, most of the published reports still have concern for their use as the main intermediates for the synthesis of completely condensed monofunctionalized silsesquioxanes RR′ 7 Si 8 O 12 (R = reactive group, R′ = inert group) , or IC-POSS s with a wide variety of functionalities situated at the opening moieties. ,,− …”

Surface Segregation of a Star-Shaped Polyhedral Oligomeric Silsesquioxane in a Polymer Matrix

“…Polyhedral oligomeric silsesquioxane (POSS), , which consists of a silica cage with organic groups, is a stoichiometric compound between silica and silicone, exhibiting unique characteristics between inorganic and organic substances. , Thus, POSS has been extensively studied as a unique filler for polymers to control factors such as thermal and mechanical properties, optical properties, gas permeability, dielectric properties, and flame retardancy. − Postulating that POSS has a lower surface energy based on the cubic structure composed of Si–O bonds, it seems reasonable to suppose that it would be a good candidate as a surface modifier. Although this is true, it can become crystallized at the surface, leading to a rough surface.…”

Preparation of Tri(alkenyl)functional Open-Cage Silsesquioxanes as Specific Polymer Modifiers

“…However, they offer interesting synthetic possibilities due to the opportunity to introduce more than one functional group within the silsesquioxanes core bearing at the same time also inert ones. As a result, the perspectives for the further development of this group of compounds are vast, from nanostructured coating films [13], silica-grafted catalysts [21,22], tripodal ligands for transition metals [23], novel cage host molecules [24], aggregates in cosmetics and food manufacturing [25,26], or dentistry [27,28] to polymers modifiers as cross-linking agents [29][30][31][32][33][34]. Multi-functional SQs may additionally offer the possibility to obtain three-dimensional (3D) copolymeric networks, leading to substantial improvement in their physicochemical properties, i.e., increased thermal and oxidation resistance, mechanical properties, e.g., hardness, as well as the reduction of flammability, heat evolution, viscosity during processing, etc.…”