Materials Literature
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Abstract Three clay samples (a kaolinite, a halloysite and an inseparable mixture of kaolinite-palygorskite-illite-montmorillonite) were, after a mild pretreatment, successfully tested as catalysts in the polymerization of styrene. The catalytic activity of the clay (measured by the conversion rate), the MW and the co…
Single‐phase solid solutions of2H crystal type in the SiC‐AIN system containing 50 and 75 mol% AIN were fabricated by hot‐pressing mixtures of SiC and AIN powders. Dense samples were subjected to thermal treatments over a range of temperatures between 1600° and 1900°C for a period of time up to 320 h. Transmission ele…
Electrochromic characteristics of familiar organic materials with relatively simple molecular structures, such as dimethyl terephthalate, are described. Coloration occurred at the cathode of all cells examined; the color spontaneously bleached upon removing the voltage. Electrochemically induced optical absorption was…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDefect-free, crystalline aromatic poly(etherketones): a synthetic strategy based on acetal monomersDonald R. Kelsey, Lloyd M. Robeson, Robert A. Clendinning, and C. Scott BlackwellCite this: Macromolecules 1987, 20, 6, 1204–1212Publication Date (Print):June 1, 1987Publicatio…
Abstract Three samples of poly(1,2‐cyclohexene oxide) were prepared with ZnEt 2 , (EtZnOMe) 4 , and [{MeOCH 2 CH(Me)OZnO(Me)CHCH 2 OMe} 2 · {EtZnO(Me)CHCH 2 OMe} 2 ] ([Zn‐MP] 2,2 ), respectively, as initiator. Each polymer sample was treated with butyllithium to form various decomposition products having double bonds…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic reactions of metalloporphyrins. 3. Catalytic modification of hydroboration-oxidation of olefins with rhodium(III) porphyrin as catalystYasuhiro Aoyama, Yasutaka Tanaka, Takeshi Fujisawa, Takamichi Watanabe, Hiroo Toi, and Hisanobu OgoshiCite this: J. Org. Chem. 198…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDivalent lanthanoid synthesis in liquid ammonia. 2. The synthesis and x-ray crystal structure of (C8H8)Yb(C5H5N)3.1/2C5H5NAndrea L. Wayda, Ishita. Mukerji, James L. Dye, and Robin D. RogersCite this: Organometallics 1987, 6, 6, 1328–1332Publication Date (Print):June 1, 1987P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLigating properties of monomeric cis-trioxometal(VI) complexes of molybdenum(VI) and tungsten(VI). Preparation and spectroscopic characterization of LMO3 and [(LMO3)4CoII](ClO4)2 (M = Mo, W; L = cyclic triamine)Partha S. Roy and Karl WieghardtCite this: Inorg. Chem. 1987, 26…
Abstract The water absorption of cellulose fibers has been reduced after the cellulose surface was treated by mono‐ ordi‐methylomelamine(DMM) resin. The wet strength of cellulose‐polyester composites was also enhanced considerably. Scanning electron microscopy, transmission electron microscopy, and electron spectrosco…
A study of the graft copolymerization of methyl methacrylate onto jute fiber, using K2S2O8-thiourea (TU) redox-initiating system has been made. The effects of concentration of monomer, S2O, TU on graft yield have been studied. Besides the effects of time, temperature, acid, and amount of jute fiber, some inorganic sal…
For pt.I see ibid., vol.17, p.1419 (1987). Spin-density measurements for a single crystal of the FCC alloy Fe 66 Mn 34 have been performed using elastic and inelastic neutron scattering. Combining the results from elastic scattering with the experimentally determined symmetry of the spin wave spectrum it has been uneq…
Isotope effects on the ${\mathrm{BaTiO}}_{3}$ ferroelectric phase transitions and on its melting temperature are given. The materials used are a light $^{46}\mathrm{rich}$ denatured ${\mathrm{BaTiO}}_{3}$ and ${\mathrm{a}}^{134}$Ba-rich ${\mathrm{BaTiO}}_{3}$, in which the molecular weight is lighter than in naturally…
Phosphorus oxynitride (PON) glasses, prepared by remelting phosphate glasses in anhydrous ammonia vapor, are more resistant to dissolution in water and corrosion in humid environments than the parent phosphate glasses. The chemical durability of PON glasses is directly related to their nitrogen content. Solution analy…
The rate of silicon homoepitaxy from SiH4/H2 mixtures has been studied between 750 and 850 °C using a new ultrahigh-vacuum-compatible low pressure reactor. The analysis of the experimental data is novel in including the effects of both nonepitaxial deposition within the reactor and of gas pumping speed. Epitaxy by pyr…
The possible lower symmetries (subgroups) of the ${A}_{2}$${\mathrm{BX}}_{4}$ structure (space-group symmetry ${D}_{4h}^{17}$) due to rigid octahedral tiltings at phase transitions are investigated. The method for obtaining subgroups determined by reducible representations (i.e., coupled order parameters) is described…
Abstract Dimethyl 1,4‐cyclohexanedicarboxylate was treated with various potential isomerization catalysts under reflux (ca. 280°C). Lithium cloride and sulfonic acids caused rapid isomerization. Also the diphenyl ester and 1,4‐cyclohexandicarbonyl dichloride were isomerized, and in all cases a thermodynamically contro…
Oxygen perovskites show remarkable diversity in chemical composition. Ferroelectric and ferrodistortive effects are observed extraordinarily often. The chemical bonds represent an intermediate state between ionic (heteropolar) and covalent (homopolar) bond formation. The electronegativities defined by Pauling serve he…
The acidic and basic solubilities of the potential thermal barrier oxide components CeO2, HfO2, and Y2O3 were measured as a function of solvent basicity for fused Na2SO4-30 mol% NaVO3 at 900 C and 1 atm O2. Y2O3 solubility was higher than that of CeO2 or HfO2. For comparison, the solubility of CeO2 was measured in pur…
In certain ferroelectric liquid crystals that contain the biphenylyl moiety, the spontaneous polarization undergoes a change in direction relative to the optical axis of the system as a function of temperature. Consequently, at a characteristic temperature for a particular derivative, the polarization vanishes. A mode…
Electron-spin-resonance (ESR) studies of pristine and heavily doped polyacenic materials prepared by pyrolytic treatment of phenolformaldehyde resin have been carried out. Five pyrolysis temperatures (${T}_{p}$) in the range 500--900 \ifmmode^\circ\else\textdegree\fi{}C were selected to check the magnetic properties o…