Now showing items 11-20 of 31
The synthesis of functional polyphosphazenes and their surfaces
(John Wiley & Sons, Ltd., 1998-10)
The macromolecular substitution approach for the synthesis of polyphosphazenes provides access to many different polymers. However, it precludes the use of reagents that contain two or more functional groups because such ...
Liquid-crystalline phase transition in organophosphazenes
(John Wiley & Sons, Ltd., 1998-10)
Organophosphazenes with a similar mesogenic moiety were prepared and their mesogenicity was studied by differential scanning calorinetry (DSC) measurements and polarizing microsope observations. In cyclotriphosphazenes ...
Pt/MCM-41 catalyst for selective catalytic reduction of nitric oxide with hydrocarbons in the presence of excess oxygen
(Kluwer Academic Publishers-Plenum Publishers; Kluwer Academic Publishers ; Springer Science+Business Media, 1998-03)
First results are reported on the use of MCM-41 mesoporous molecular sieve as the support for Pt for the selective catalytic reduction of NO by hydrocarbons in the presence of O 2 . MCM-41 provided the highest specific NO ...
Atomistic Simulation of Curvature Driven Grain Boundary Migration
(Kluwer Academic Publishers; Springer Science+Business Media, 1998-02)
We present two dimensional molecular dynamics simulations of grain boundary migration using the half-loop bicrystal geometry in the experiments of Shvindlerman et al. We examine the dependence of steady-state grain boundary ...
Polyhedral oligomeric silsesquioxane(POSS)-based polymers
(John Wiley & Sons, Ltd., 1998-10)
A diverse and entirely new class of monomer and polymer technology based on polyhedral oligomeric silsesquioxane (POSS) reagents has been developed. POSS reagents are unique in that they are physically large (approx. 15 14° ...
Main-chain poly(arylene ether) phosphonium ionomers
(John Wiley & Sons, Ltd., 1998-10)
Poly(arylene ether) main-chain phosphonium ionomers were successfully synthesized and characterized. The reaction scheme involved first preparing the poly(arylene ether phosphine oxide) by a nucleophilic step or condensation ...
Processing and properties of (Mo,Cr) oxycarbides from MOCVD
(John Wiley & Sons, Ltd., 1998-03)
A review of the coating kinetics of molybdenum and chromium oxycarbides and a study on the properties of deposited films are reported. Molybdenum carbonyl, chromium carbonyl and their mixture were used to prepare coatings ...
Trends in precursor design for conventional and aerosol-assisted CVD of high- T c superconductors
(John Wiley & Sons, Ltd., 1998-03)
Conventional MOCVD techniques require molecules displaying volatility and constant vapor pressure. Metal oxide precursors, i.e., β-diketonates, or classical or functionalized metal alkoxides are mostly solids. The various ...
Grafting of polymers onto a carbon black surface by the trapping of polymer radicals
(John Wiley & Sons, Ltd., 1998-10)
The grafting of polymers onto a carbon black surface based on the trapping of polymer radicals by polycondensed aromatic rings of the surface was investigated. It was found that polymer radicals formed by the thermal ...
Polyfunctional cubic silsesquioxanes as building blocks for organic/inorganic hybrids
(John Wiley & Sons, Ltd., 1998-10)
Cubic silsesquioxanes, [RSiO 1.5 ] x , potentially offer access to organic/inorganic hybrids wherein the exact shape, size and mechanical properties of the inorganic component are perfectly defined. Furthermore, by ...