The Experts below are selected from a list of 294 Experts worldwide ranked by ideXlab platform
Thomas J Pinnavaia - One of the best experts on this subject based on the ideXlab platform.
-
thermoset epoxy clay nanocomposites the dual role of α ω Diamines as clay surface modifiers and polymer curing agents
Journal of Solid State Chemistry, 2002Co-Authors: Costas S Triantafillidis, Peter C Lebaron, Thomas J PinnavaiaAbstract:Diprotonated forms of polyoxypropylene Diamines of the type α,ω-[NH3CHCH3CH2(OCH2CHCH3)xNH32+ with x=2.6, 5.6, and 33.1, have been intercalated into montmorillonite and fluorohectorite clays and subsequently evaluated for the formation of glassy epoxy–clay nanocomposites. The intercalated onium ions functioned concomitantly as a clay surface modifier, intragallery polymerization catalyst, and curing agent. Depending on the chain length of the Diamine, different orientations of the propylene oxide chains were adopted in the clay galleries, resulting in basal spacings from ∼14 A (lateral monolayer, x=2.6) to ∼45 A (folded structure, x=33.1). The initial clay basal spacings were correlated with the formation of intercalated and exfoliated clay–epoxy nanocomposites with improved mechanical properties and high thermal stabilities. In comparison to clay–monoamine intercalates, the use of Diamine intercalates greatly reduced the plasticizing effect of the alkyl chains on the polymer matrix, resulting in improved mechanical properties while at the same time reducing the cost and time needed for nanocomposite fabrication.
-
Thermoset Epoxy–Clay Nanocomposites: The Dual Role of α,ω-Diamines as Clay Surface Modifiers and Polymer Curing Agents
Journal of Solid State Chemistry, 2002Co-Authors: Costas S Triantafillidis, Peter C Lebaron, Thomas J PinnavaiaAbstract:Diprotonated forms of polyoxypropylene Diamines of the type α,ω-[NH3CHCH3CH2(OCH2CHCH3)xNH32+ with x=2.6, 5.6, and 33.1, have been intercalated into montmorillonite and fluorohectorite clays and subsequently evaluated for the formation of glassy epoxy–clay nanocomposites. The intercalated onium ions functioned concomitantly as a clay surface modifier, intragallery polymerization catalyst, and curing agent. Depending on the chain length of the Diamine, different orientations of the propylene oxide chains were adopted in the clay galleries, resulting in basal spacings from ∼14 A (lateral monolayer, x=2.6) to ∼45 A (folded structure, x=33.1). The initial clay basal spacings were correlated with the formation of intercalated and exfoliated clay–epoxy nanocomposites with improved mechanical properties and high thermal stabilities. In comparison to clay–monoamine intercalates, the use of Diamine intercalates greatly reduced the plasticizing effect of the alkyl chains on the polymer matrix, resulting in improved mechanical properties while at the same time reducing the cost and time needed for nanocomposite fabrication.
Costas S Triantafillidis - One of the best experts on this subject based on the ideXlab platform.
-
thermoset epoxy clay nanocomposites the dual role of α ω Diamines as clay surface modifiers and polymer curing agents
Journal of Solid State Chemistry, 2002Co-Authors: Costas S Triantafillidis, Peter C Lebaron, Thomas J PinnavaiaAbstract:Diprotonated forms of polyoxypropylene Diamines of the type α,ω-[NH3CHCH3CH2(OCH2CHCH3)xNH32+ with x=2.6, 5.6, and 33.1, have been intercalated into montmorillonite and fluorohectorite clays and subsequently evaluated for the formation of glassy epoxy–clay nanocomposites. The intercalated onium ions functioned concomitantly as a clay surface modifier, intragallery polymerization catalyst, and curing agent. Depending on the chain length of the Diamine, different orientations of the propylene oxide chains were adopted in the clay galleries, resulting in basal spacings from ∼14 A (lateral monolayer, x=2.6) to ∼45 A (folded structure, x=33.1). The initial clay basal spacings were correlated with the formation of intercalated and exfoliated clay–epoxy nanocomposites with improved mechanical properties and high thermal stabilities. In comparison to clay–monoamine intercalates, the use of Diamine intercalates greatly reduced the plasticizing effect of the alkyl chains on the polymer matrix, resulting in improved mechanical properties while at the same time reducing the cost and time needed for nanocomposite fabrication.
-
Thermoset Epoxy–Clay Nanocomposites: The Dual Role of α,ω-Diamines as Clay Surface Modifiers and Polymer Curing Agents
Journal of Solid State Chemistry, 2002Co-Authors: Costas S Triantafillidis, Peter C Lebaron, Thomas J PinnavaiaAbstract:Diprotonated forms of polyoxypropylene Diamines of the type α,ω-[NH3CHCH3CH2(OCH2CHCH3)xNH32+ with x=2.6, 5.6, and 33.1, have been intercalated into montmorillonite and fluorohectorite clays and subsequently evaluated for the formation of glassy epoxy–clay nanocomposites. The intercalated onium ions functioned concomitantly as a clay surface modifier, intragallery polymerization catalyst, and curing agent. Depending on the chain length of the Diamine, different orientations of the propylene oxide chains were adopted in the clay galleries, resulting in basal spacings from ∼14 A (lateral monolayer, x=2.6) to ∼45 A (folded structure, x=33.1). The initial clay basal spacings were correlated with the formation of intercalated and exfoliated clay–epoxy nanocomposites with improved mechanical properties and high thermal stabilities. In comparison to clay–monoamine intercalates, the use of Diamine intercalates greatly reduced the plasticizing effect of the alkyl chains on the polymer matrix, resulting in improved mechanical properties while at the same time reducing the cost and time needed for nanocomposite fabrication.
Michael North - One of the best experts on this subject based on the ideXlab platform.
-
titanium iv salen and vanadium v salen complexes derived from c2 and c1 symmetric Diaminesfor asymmetric cyanohydrin synthesis
Synlett, 2008Co-Authors: Yuri N Belokon, Jamie Hunt, Michael NorthAbstract:Titanium and vanadium salen complexes have been prepared from C 2 - and Ci-symmetric acyclic Diamines. All of the complexes catalysed the asymmetric addition of trimethylsilyl cyanide to benzaldehyde and the sense of asymmetric induction was determined by the nature of the substituents. The vanadium complex of a valine-derived Diamine gave good results with a range of aromatic and aliphatic aldehydes.
Peter C Lebaron - One of the best experts on this subject based on the ideXlab platform.
-
thermoset epoxy clay nanocomposites the dual role of α ω Diamines as clay surface modifiers and polymer curing agents
Journal of Solid State Chemistry, 2002Co-Authors: Costas S Triantafillidis, Peter C Lebaron, Thomas J PinnavaiaAbstract:Diprotonated forms of polyoxypropylene Diamines of the type α,ω-[NH3CHCH3CH2(OCH2CHCH3)xNH32+ with x=2.6, 5.6, and 33.1, have been intercalated into montmorillonite and fluorohectorite clays and subsequently evaluated for the formation of glassy epoxy–clay nanocomposites. The intercalated onium ions functioned concomitantly as a clay surface modifier, intragallery polymerization catalyst, and curing agent. Depending on the chain length of the Diamine, different orientations of the propylene oxide chains were adopted in the clay galleries, resulting in basal spacings from ∼14 A (lateral monolayer, x=2.6) to ∼45 A (folded structure, x=33.1). The initial clay basal spacings were correlated with the formation of intercalated and exfoliated clay–epoxy nanocomposites with improved mechanical properties and high thermal stabilities. In comparison to clay–monoamine intercalates, the use of Diamine intercalates greatly reduced the plasticizing effect of the alkyl chains on the polymer matrix, resulting in improved mechanical properties while at the same time reducing the cost and time needed for nanocomposite fabrication.
-
Thermoset Epoxy–Clay Nanocomposites: The Dual Role of α,ω-Diamines as Clay Surface Modifiers and Polymer Curing Agents
Journal of Solid State Chemistry, 2002Co-Authors: Costas S Triantafillidis, Peter C Lebaron, Thomas J PinnavaiaAbstract:Diprotonated forms of polyoxypropylene Diamines of the type α,ω-[NH3CHCH3CH2(OCH2CHCH3)xNH32+ with x=2.6, 5.6, and 33.1, have been intercalated into montmorillonite and fluorohectorite clays and subsequently evaluated for the formation of glassy epoxy–clay nanocomposites. The intercalated onium ions functioned concomitantly as a clay surface modifier, intragallery polymerization catalyst, and curing agent. Depending on the chain length of the Diamine, different orientations of the propylene oxide chains were adopted in the clay galleries, resulting in basal spacings from ∼14 A (lateral monolayer, x=2.6) to ∼45 A (folded structure, x=33.1). The initial clay basal spacings were correlated with the formation of intercalated and exfoliated clay–epoxy nanocomposites with improved mechanical properties and high thermal stabilities. In comparison to clay–monoamine intercalates, the use of Diamine intercalates greatly reduced the plasticizing effect of the alkyl chains on the polymer matrix, resulting in improved mechanical properties while at the same time reducing the cost and time needed for nanocomposite fabrication.
Frank Glorius - One of the best experts on this subject based on the ideXlab platform.
-
design of ru ii nhc Diamine precatalysts directed by ligand cooperation applications and mechanistic investigations for asymmetric hydrogenation
Journal of the American Chemical Society, 2020Co-Authors: Wei Li, Tobias Wagener, Lars Hellmann, Constantin G Daniliuc, Christian Mucklichtenfeld, Johannes Neugebauer, Frank GloriusAbstract:A modular synthesis of Ru(II)-NHC-Diamine complexes from readily available chiral N-heterocyclic carbenes (NHCs) and chiral Diamines is disclosed for the first time. The well-defined Ru(II)-NHC-dia...