Materials Literature
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Abstract A postirradiation process was evaluated in polymerizing vinyl monomers on poly(ethylene terephthalate) (PET) film, fiber, and fabric. The use of DMF, pyridine, and DMSO as swelling agents to facilitate monomer incorporation and effective polymerization were also investigated. The solvents were effective in pr…
Abstract Reaction of cellulose with hexamethylphosphoric acid triamide has been investigated under various physical conditions. Dimethylamine hydrochloride was found to be an efficient catalyst for the system. The thermal degradation of cellulose and its phosphoramide products in air was studied by DTA, TG, and DTG te…
Abstract Tri‐ O ‐methyl‐, ‐ethyl‐, ‐ n ‐propyl‐, ‐ n ‐butyl‐, ‐ n ‐pentyl‐, ‐iso‐amyl‐, ‐ n ‐hexyl‐, ‐ n ‐heptyl‐, ‐ n ‐octyl‐, ‐ n ‐decyl‐, and ‐3‐phenoxypropyl‐celluloses have been prepared with powdered sodium hydroxide and the corresponding alkyl iodides or bromides in one of nonaqueous cellulose solvents, SO 2 ‐d…
Abstract Crosslinked xerogels in the form of rods have been prepared to > 99.9% conversion by the γ‐ray initiated copolymerization in vacuo ob n ‐butyl acrylate (BA) with N ‐vinyl‐2‐pyrrolidone (VP) in the presence and absence of a crosslinking agent. Thin (about 0.5 mm) disks were swollen in water at 21°C, the fin…
Abstract Hyperfine data and g factors are reported for the radical cations of tetrathiafulvalene (TTF; 1 ) and of its derivatives 2–13 . From the intense satellite spectra of 1 + – 13 + not only the coupling constants of the 33 S isotopes in the TTF moiety could be determined, but also, in favourable cases, those of t…
Abstract Studies on impact behaviour of the blend of isotactic polypropylene (PP) with styrene‐ b ‐ethylene‐co‐butylene– b ‐styrene triblock copolymer (SEBS) in the composition range 0–25 wt % SEBS at three temperatures, viz., ambient, −30°C, and −190°C, are presented. Dynamic mechanical properties on a torsion pendul…
Abstract Chiral metals are so far practically unknown. The synthesis of a chiral substrate for possible organic conductors and superconductors is described.
We observed that the photoemission intensity from solids may depend explicitly on the spin state of the photoexcited electrons. This new phenomenon is explained by spin-dependent transmission through the surface of solids with nonvanishing spin-orbit coupling. It is demonstrated for photoemission from Pt(111) with ell…
X-ray diffraction measurements were performed at atmospheric pressure on a high-density form of amorphous ice obtained by pressurizing crystalline ice Ih at 77 K, up to 2 GPa. The low--momentum-transfer region of the determined structure factor is quite different from that corresponding to the low-density form of amor…
Secondary grain growth in thin Au films on SiO2 substrates is reported. Secondary grains have {111} texture which minimizes the surface energy. This indicates that surface energy anisotropy provides selectivity in the driving force for growth of secondary grains. In thin Au films on SiO2, surface-energy-driven seconda…
For a given temperature below the smectic-A (SmA)--chiral--smectic-C (${\mathrm{SmC}}^{\mathrm{*}}$) transition of DOBAMBC, polarization (P) and tilt-angle (theta) have been measured almost simultaneously with high resolution. The ratio P/theta stays fairly constant for ${\mathrm{T}}_{\mathrm{c}}$-T>2 K and shows a…
Dense tetragonal zirconia-yttria ceramics has been prepared with grain sizes between 0.1 and 0.5 µm. The fracture toughness and flexure strength at room temperature are independent on grain size and composition in the tetragonal phase region with YO1.5 larger than 5 at.%. The ageing rate of the mechanical properties i…
Methods for the solution of thermal-hydraulic problems in liquid-metal fast breeder reactors arising primarily from transient accident analysis are reviewed. Principal emphasis is given to the important phenomenological issues of sodium boiling and fuel motion. Descriptions of representative phenomenological and mathe…
The authors prepare double borates of scandium and cerium subgroup rare earths with the general formula RSc/sub 3/ (BO/sub 3/)/sub 4/ (R = Ce, Pr, Nd, Sm). It has been shown that these compounds have the structure of the carbonate mineral huntite. Their IR and luminescence spectra have been studied.
The 35 Cl NQR frequency and spin-lattice relaxation rate in the compounds A 2 PbCl 6 (A = Cs, Rb, NH 4 , K) have been investigated in the range 4.2 K to 500 K, and as a function of pressure at room temperature. NQR experiments conducted on (K: NH 4 ) 2 PbCl 6 mixed crystals have been used to complete the NQR-frequency…
The presence of agglomerates has an important influence on the densification behaviour of ceramic powders. The interdependence between the compact structure and its sintering behaviour will be discussed for TiO2 powders with different characteristics.
Abstract The photophysical properties of a series of chromium alkylamines with CrN 6 skeletons were studied in a mixture of dimethylsulfoxide (DMSO) and water (1:1 vv). For the analogous N‐deuterated compounds DMSO/D 2 O (1:1 vv) was used as the solvent Absorption spectra, phosphorescence quantum yields, and phosphor…
Using the Runge-Kutta and Newton-Raphson methods, the electric fileds on the bushing-type insulator surface covered partly by a corona-suppression semiconductor coating with a field-dependent resistivity have been computed for semiconductors having various resistivityfield ield (p-E) characteristics. The field distrib…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCadmium-113 nuclear magnetic resonance spectroscopic study of mixed-ligand tetranuclear clusters of the type [Cd4(EPh)x(E'R)10-x]2- and of the mixed-metal clusters [CdxZn4-x(SPh)10]2-Philip A. W. Dean and Jagadese J. VittalCite this: Inorg. Chem. 1986, 25, 4, 514–519Publicat…
As in many other electrotechnical fields, the research work and the early realizations in the cable field during the second half of the last century were the germ of most of the techniques developed in the 20th century. For more than 70 years, paper impregnated with oilresin compounds or simply with oil, prevailed as…