Materials Literature
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Abstract The cure process and the mechanical properties of blends of diglycidyl ether of bisphenol‐A–based epoxy resin and hydroxyl terminated, internally epoxidized polybutadiene rubber have been studied. Internal oxirane groups are characterized by a main absorption at 885 cm −1 in the infrared spectrum while the te…
Cd1−xYxSb2O6 thin films were deposited onto a silica glass substrate by rf sputtering method. The highest conductivity observed for Cd0.95Y0.05Sb2O6 thin films was 4.1×10 S cm−1, with a carrier concentration of 1.3×1020 cm−3 and a Hall mobility of 1.9 cm2 V−1S −1. No distinct optical absorption band was observed from…
We have performed an in-depth correlation-crystal-field (CCF) analysis of the energy-level structures in 10 Nd 3+ (4f 3 ) crystal systems: NdF 3 , Nd 2 Te 4 O 11 , NdVO 4 , NdPO 4 , Nd 3+ :LiYF 4 , Nd 3+ :LaVO 4 , Nd 3+ :LaCl 3 , Nd 3+ :BaY 2 F 8 , Nd 3+ :YAlO 3 and Nd 3+ :LuA1O 3 . A model Hamiltonian employing 20 fr…
Crystalline and stoichiometric KNbO3 thin films have been grown on (100) oriented MgO substrates by pulsed laser deposition technique. Electron microprobe analysis and Rutherford backscattering spectroscopy of the films show a progressive loss of K with increasing substrate-target distance. To compensate for this K lo…
We have measured the full two-photon absorption (TPA) spectrum in the transparency range of single-crystal polydiacetylene paratoluene-sulfonate (PTS) using $z$ scan. The spectrum consists of three well-defined two-photon excited states superimposed on a continuum of even-parity states. Comparison of the TPA and the o…
Abstract The thermal degradation of polyurethane is exothermic in nature. The addition of CaCO 3 inverts the exothermicity to endothermic behavior in the presence of air. © 1994 John Wiley & Sons, Inc.
The incorporation of nitrogen in diamond films and its effect on film growth were investigated. The nitrogen doping efficiency was found to be very low, consistent with a model of film growth involving simultaneous deposition and etching, which predicts a doping efficiency of 10−4. The growth habit was found to change…
We measured dendritic tip velocities in pure succinonitrile (SCN) in microgravity, using a sequence of telemetered binary images sent to Earth from the space shuttle Columbia (STS-62). Growth velocities were measured as a function of the supercooling over the range 0.05-1.5 K. Microgravity observations show that buoya…
Kaolinitic claystones in Paleozoic paleokarst underlying the Middle Pennsylvanian Fort Scott Limestone near Drake, Missouri, contain abundant fossil root traces. These include a surficial root mat as well as stout, woody, deeply penetrating root traces: a rooting pattern similar to that under rain forest. Also similar…
Empirical treatment of reaction sites Complex reactions Solvent effects on reaction rates Fast reactions in solution Two-phase liquid-liquid reactions.
Boron-doped, highly oriented, (100) textured diamond films have been examined by cathodoluminescence in a transmission electron microscope to assess the distribution of the defects and boron dopant within the films. Dislocation-related luminescence, which is believed to be unrelated to boron, was found to originate in…
The synergy of theory and experiment also works for liquid crystals. Relatively simple calculations offer explanations for the unexpected effect of an alkoxy terminus on the dipole moment of liquid crystal molecules such as 1 and point the way to efficient syntheses of new materials with highly attractive properties f…
Electron localization effects in polyaniline have been investigated through the dependence of DC conductivity and magnetic susceptibility on thermal aging. A dramatic effect of thermal aging on conductivity is reported in the insulator-to-metal transition region, which is interpreted as due to the onset of structural…
Abstract Polyvinyl alcohol amidoxime (PVAAO) chelate fiber prepared in our laboratory is a good adsorbent. Comparing with other adsorbents, it has many advantages, such as higher hydrophilicity, better adsorbability and easier synthesis. In this work, the synthesis course, structure and properties of PVAAO fiber have…
Abstract The crystallization behavior of polyolefins–nylon 6 polymer blends was studied by differential scanning calorimetry (DSC) measurements. In these blends, the crystallization of the minor component often starts with distinctly deeper supercooling than that of the pure polymer, and proceeds in several separate s…
We have studied the structural and magnetic properties of two compounds from the Me 3 2+ (Fe 3+ (CN) 6 - ) 2 3- .H 2 O family, where Me=Ni and Co. From x-ray analysis we find that the compounds crystallize in the face-centred cubic structure with the space group of F43m. Both the Fe and Me ions are coordinated octahed…
Epitaxy of Ge on Si(001) from undersaturated solutions demonstrates a novel principle: minimization of interfacial energy between solution and solid in a system provides the driving force for heteroepitaxy. Growth according to this principle leads to sharp heterointerfaces and Ge layers free of nucleation sites for di…
Li 0.5+0.5x Ti x Fe 2.5-1.5x O 4 , x<or=0.7, has been investigated using X-ray powder diffraction (17-70 degrees 2 theta ) and Mossbauer spectroscopy (300 and 77 K). All compositions show single cubic spinel structure with a constant lattice parameter of 0.833 nm. The room temperature Mossbauer spectra gave magnetic s…
Abstract Polyurethane anionomer dispersions were prepared from hydrogenated diphenylmethane diisocyanate (H 12 MDI) or isophorone diisocyanate (JPDI), poly(caprolactone) (PCL) diol, 1,4‐butane diol (BD), and dimethylolpropionic acid (DMPA). Upon neutralization of the DMPA with triethylamine (TEA), the NCO‐terminated p…
Examples of only the second known man-made isomer of porphyrin (1, Ar = C6H5, C6H4CH3) have recently been prepared by two groups working independently on opposite sides of the globe. These groups, led by L. Latos-Grażyński and H. Furuta, have shown that this isomer displays characteristics expected for a porphyrin whi…