Materials Literature
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The epichlorohydrin elastomers were discovered in early 1957 when the author's new vinyl ether coordination catalyst was explored for epichlorohydrin polymerization and yielded a new rubber, amorphous polyepichlorohydrin. This work quickly led to the discovery of unique new organometallic catalysts which facilitated t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAddition compounds of alkali metal hydrides. 22. Convenient procedures for the preparation of lithium borohydride from sodium borohydride and borane-dimethyl sulfide in simple ether solventsHerbert C. Brown, Yong Moon Choi, and S. NarasimhanCite this: Inorg. Chem. 1982, 21,…
Abstract A short, critical review is provided on the utilization of surface techniques, particularly ESCA, for the study of metal and alloy corrosion problems. Some of the attributes and difficulties of these techniques are considered. An interrelated series of Cu systems are chosen as representative examples of the u…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetermination of the onset of the dezincification of .alpha.-brass using x-ray photoelectron (ESCA) spectroscopyT. L. Barr and J. J. HackenbergCite this: J. Am. Chem. Soc. 1982, 104, 20, 5390–5394Publication Date (Print):October 1, 1982Publication History Published online1 M…
The thermal expansion coefficients of a number of phenacites [Be2SiO4, β-Si3N4, β-Sialon, α-LiAlSiO4, Zn2SiO4, CdAl2O4, and Zn2GeO4] at temperatures at and above the Debye temperature are analyzed in terms of the thermal Grüneisen parameter γ. The phenacites have γ values intermediate between adamantine crystals and q…
Optical absorption, luminescence, and Raman spectra were measured for sodium silicate glasses melted in air, containing about 85% Fe(III) and 15% Fe(II). Luminescence intensities for individual samples were compared. Three d-d bands in the optical absorption spectrum due to Fe(III) at about 26,000, 24,000, and 23,000…
Ultrasonic (20 kHz, 70 W) solution degradations of polystyrene, substituted polystyrenes, and poly(n-vinyl carbazole) have been carried in toluene and tetrahydrofuran at 27 and -20°C in the presence of flexible chain polymers. Polystyrene formed block copolymers at 27°C with stiff-chain polymer PVCz; however, in the p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structure of novel mononuclear and binuclear zerovalent platinum complexes involving coordination by tin centers to give heteropolymetallic arrays of three or five atoms. A unique bridging function for bivalent tin and a new class of platinum(0) dimersGordon W.…
Centrifugation for long times or at high speeds resulted in progressively decreasing concentrations of iron and aluminum in 0.1 M sodium pyrophosphate extracts of soil. Centrifugation at 80 000 g for 6 hours, as compared with 20 000 g for 20 minutes, decreased the Fe concentrations from 23 to 80 percent and the Al con…
Temperature changes as a result of large rapid hydrostatic pressure changes were measured for poly(methyl methacrylate) at various temperatures from ambient to 95 °C and for various pressure increments from 14 to 207 MN/m2. We observe complete reversibility of the measurements over the pressure range studied. The valu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotodisproportionation of .mu.-oxo-bis[(tetraphenylporphinato)iron(III)]Robert M. Richman and Mark W. PetersonCite this: J. Am. Chem. Soc. 1982, 104, 21, 5795–5796Publication Date (Print):October 1, 1982Publication History Published online1 May 2002Published inissue 1 Octob…
Cell-parameter and structure refinements using single-crystal X-ray diffraction have been carried out on three natural low-Ca anorthoclases (K-analbites), (Or32.5Ab66.7Ano.s, Or22.3Ab7o.sAn69'Orl3.sAbs3.7An2.5),at room temperature and at temperatures above the triclinic/monoclinic symmetry inversion (400°, 510°, and 7…
Two alkyl-substituted cyclic ketene acetals, 4-n-hexyl-2-methylene-1,3-dioxolane (4) and 4-n-decyl-2-methylene-1,3-dioxolane (6), were shown to undergo free radical ring-opening polymerization with the introduction of an ester group into the backbone of an addition polymer. The spontaneous polymerization of 4 (presuma…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic structure of uranium halides and oxyhalides in the solid state. An x-ray photoelectron spectral study of bonding ionicityElisabeth Thibaut, Jean Pol Boutique, Jacques J. Verbist, Jean Claude Levet, and Henri NoelCite this: J. Am. Chem. Soc. 1982, 104, 20, 5266–527…
Abstract The reaction products of gaseous TiCl4 with ammonia were TiCl4·5NH3 at 200 °C, TiCl4·5NH3, TiClN, and NH4Cl at 250–400 °C, TiCl4·5NH3, TiClN, TiNx, and NH4Cl at 450–650 °C, TiNx and NH4Cl at 700–1000 °C, and TiNx, NH4Cl, and HCl at 1100–1400 °C. The N/Ti atomic ratio, x, of the TiNx formed was 1.21 at 700 °C,…
Abstract The complex piezoelectric constant ( d = d ′ − id ″), elastic constant ( c = c ′ + ic ″), and dielectric constant (ε = ε′ − i ε″) were measured at a frequency of 10 Hz over the temperature range from −150 to 50°C and for a range of hydration up to 0.26 g/g for decalcified bone and up to 0.084 g/g for bone. Fo…
The exchange coupling between rare-earth ($R$) and transition-metal ($T$) moments in ${R}_{x}{T}_{y}$ compounds is not so large as to hold the $R$ and $T$ moments rigidly parallel (for light rare-earth elements) or antiparallel (for heavy rare-earth elements); ionic magnetocrystalline anisotropy energy can be comparab…
The aging of simulated nuclear waste glass by contact with a controlled-temperature, humid atmosphere results in the formation of a double hydration layer penetrating into the glass and in the formation of minerals on the glass surface. The hydration process described here provides insight into the aging kinetics of n…
Abstract Protoporphyrin IX and its various ester derivatives have been previously shown to undergo self‐sensitized photooxygenation to yield hydroxyaldehydes (photoprotoporphyrin) and mono‐ and diformyl deuteroporphyrin derivatives. In the present study the photoreactions of these products in the presence of oxygen ha…
Neutron inelastic scattering measurements have been carried out on two single crystals of the thermally quenched gamma phase (FCC) alloy Fe 1-x Pd x with x=0.28 and 0.37. The x=0.28 sample (crystal 2) exhibits a face centred cubic to face centred tetragonal (FCC-FCT) transition at T m approximately 265K. The x=0.37 sa…