Complex impedance/electrical conductivity, differential scanning calorimetry and 7Li nuclear magnetic resonance measurements on poly (propylene oxide) complexed with two lithium salts LiN(SO2CF3)2 and LiAsF6, with compositions of eight ether oxygens per lithium, are reported. Ionic mobility, as probed by NMR linewidth and spin-lattice relaxation measurements, is strongly coupled to polymer segmental motion above Tg. The electrical conductivity for PPO8LiAsF6 is about an order of magnitude smaller than for PPO8LiN(SO2CF3)2. This ...
Calcium aluminate glass fibers offer major new opportunities in transportation, infrastructure composites and new infrared sensor applications. They possess a higher modulus than S-glass, an advantage that can yield major weight and energy savings in car, aircraft and aerospace composites, or stiffer composite parts in emerging bridge and construction markets. Their superior alkali resistance is an important advantage in cement composites. They also possess sapphire-like infrared transmission, a property that ...
Calcium aluminate glass fibers offer major new opportunities in transportation, infrastructure composites and new infrared sensor applications. they possess a higher modulus than s-glass, an advantage that can yield major weight and energy savings in car, aircraft and aerospace composites, or stiffer composites parts in emerging bridge and construction markets. their superior alkali resistance is an important advantage in cement composites. they also possess sapphire-like infrared transmission, a property that ...
Reports and critical evaluations are presented for 11 categories of subconventional-temperature ceramic processes. The 11 categories are: (1) vapor deposition, (2) melt spraying, (3) hot forming, (4) activated solid-state sintering, (5) activated sintering in the presence of a liquid phase, (6) reactive sintering and reactive hot pressing, (7) previtrified raw materials, (8) cementitious bonding, (9) high-energy-rate forming, (10) molecular deposition from the liquid, and (11) electrodeposition. Recommendations are presented regarding ...
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