Synthesis, Morphology, and Viscoelastic Properties of Polyhedral Oligomeric Silsesquioxane Nanocomposites with Epoxy and Cyanate Ester Matrices

Structure–property relationships in hybrid dental nanocomposite resins containing monofunctional and multifunctional polyhedral oligomeric silsesquioxanes

“…POSS can be thought of as analogs of the smallest possible silica particles. 7,8 However, unlike silicas, silicones, or other nanofillers, each POSS molecule contains either unreactive organic functional groups, which help POSS molecules become soluble in, and compatible with, polymers or reactive organic functional groups, making POSS molecules more suitable for polymerization or grafting. A previous study found that the incorporation of POSS into polymers resulted in improved biocompatibility and reduced inflammatory response, 9 which make this material suitable for oral use.…”

Thermostable cyanate ester resins and POSS-containing nanocomposites: influence of matrix chemical structure on their properties

“…These substituents may create covalent matrix-POSS bonding and/or promote improving compatibility of POSS molecules with polymers or monomers. New hybrid organic-inorganic CER-based thermosets with hydroxyl-, [20][21][22][23] amino-, [24,25] or epoxy-functionalized POSS units [26][27][28][29][30][31][32] have been reported. The CER/functionalized POSS nanocomposites with nanoparticles, covalently bonded to the polymer matrix, manifested improved thermal and mechanical properties.…”

Vapor Grown Carbon Fiber/Hybrid Organic-Inorganic Matrix Composites. Nanometer-sized Silsesquiozane Phase Chemically Bound in a Matrix

“…6 Octaaminophenyl(T8)POSS [1, (C 6 H 4 NH 2 )8(SiO1.5)8] and dodecaaminophenyl(T 12 )POSS [2, (C 6 H 4 NH 2 ) 1 2 (SiO 1 .5)121 were synthesized, characterized and then incorporated into two types of thermoset resins: (1) the bisphenol-F-based cyanate ester resin, PT-15, and (2) epoxy (Epon 828, Shell Chemical Corp.)/ 4,4'-diaminodiphenylmethane (DDM) resin, respectively, to make two series of nanocomposites. 7 The sum of amino groups in both DDM and POSS were held in a 1:1 mole ratio to the epoxy groups. EPON-828/1/DDM and EPON-828/2/DDM composites (78.63/0/21.37, 77.48/5/17.52, 76.34/10/13.66, 74.05/20/5.95 and 72.28/27.72/0 wt/wt/wt compositions for both series) were prepared.…”

“…EPON-828/1/DDM and EPON-828/2/DDM composites (78.63/0/21.37, 77.48/5/17.52, 76.34/10/13.66, 74.05/20/5.95 and 72.28/27.72/0 wt/wt/wt compositions for both series) were prepared. 7 PT-15/1 and PT-15/2 composites (99/1, 97/3 and 95/5 wt/wt compositions for both types) were also prepared. These nanocomposites were characterized by transmission electron microscopy (TEM), dynamic mechanical analysis (DMA), solvent extraction and FT-IR.…”

“…'17 20 Highly delaminated polydicyclopentadiene/clay nanocomposites were synthesized by in situ polymerization of dicyclopentadiene/organically-modified montmorillonite dispersions.17 Dicyclopentadiene/clay suspensions were sonicated for various times to enhance the degree of delamination prior to curing.' 7 The d-spacings of the clay in nanocomposites were monitored using X-ray diffraction and the extent of delamination was examined by TEM and preliminary neutron scattering studies. A new approach, use of confocal laser microscopy was employed to follow the dispersion of clay layers, tagged by a fluorescent dye, within the liquid monomer.…”