Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The direct synthesis of a number complexes with general composition Cu 4 OCl 6 - n(CH 3 ) 2 NH · mSolv, where n = 4, m = 0-2 and Solv = CH 3 OH, DMSO, is reported. It is shown by X-ray structure investigation, that in Cu 4 OCl 6 .4 (CH 3 ) 2 NH the copper atoms are linked by μ 4 -oxygen and μ 2 -chlorine bridging atom…
ADVERTISEMENT RETURN TO ISSUEPREVArticleSorption and transport of sulfur dioxide in polysulfoneP. H. Pfromm and W. J. KorosCite this: Macromolecules 1993, 26, 22, 6141–6142Publication Date (Print):October 1, 1993Publication History Published online1 May 2002Published inissue 1 October 1993https://pubs.acs.org/doi/10.1…
The low temperature and isothermal dynamic mechanical proper ties for different plasticizers like aromatic oil, paraffinic oil, and di-octyl phthalate (DOP) in epoxidized natural rubber (ENR) vulcanizates were stud ied. 10, 20, and 40 phr of aromatic oil were used for studying the effect of plasti cizer concentration…
<div class="htmlview paragraph">Government clean air regulations have prompted much interest in the automotive industry in alternative fuels for lower emission vehicles. Methanol fuels have become the primary focus of the auto companies in meeting these challenges. Even though the corrosiveness of methanol and c…
The crystal structure of the title compound has been determined (space group C2, a=14.600, b=7.759, c=5.142A, β=93.25°, Z=2) and refined to R=8% for 800 reflections. The structure is characterized by vierer single chains [Si 4 O 12 ] parallel to [010], which link edge-sharing zigzag chains of MnO 6 octahedra running p…
Synthetic melanogenesis, using epinephrine and other melanin precursors, within the matrix of hydrophilic polymers and copolymers of 2-hydroxyethyl methacrylate resulted in hydrogels able to absorb ultraviolet and visible radiation. This significantly enhances their value as materials for extraocular (contact lenses)…
Abstract This paper reports on the theoretical and experimental studies of structure formation and strengthening (stiffening) of flexible‐chain polymers. Two techniques of strengthening relying on the melt extrusion, i.e., orientational crystallization (crystallization initiated by melt extension) and drawing (uniaxia…
Space group Pbca, a=9.398, b=9.139, c=10.535A. The structure was solved by direct methods and refined to R=0.024 using x-ray diffractometer data. The structure is a hydroxyl nesosilicate with a single isolated Si tetrahedron and two M 2+ sites. Ca is accommodated in M1, and both Ca and Mn share M2. OH groups are stron…
The optical response in amorphous (a-)Ga 2 Se 3 semiconductor in the 1.2-5.6-eV photon-energy range at room temperature has been measured by spectroscopic ellipsometry. It is found that the dielectric function ε=ε 1 +iε 2 of a-Ga 2 Se 3 strongly resembles those of amorphous tetrahedrally bonded semiconductors. The opt…
The intermetallic compound Nd2Fe14B undergoes four-step phase transformations in a hydrogen atmosphere, namely, hydrogenation, decomposition, desorption and recombination. This phenomenon was observed in a study of the sintering behavior of an Nd-Fe-B magnet in atmospheric hydrogen gas. The sinter produced consists of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of the solvolysis of bicyclo[1.1.1]pent-1-yl derivativesKenneth B. Wiberg and Neil McMurdieCite this: J. Org. Chem. 1993, 58, 21, 5603–5604Publication Date (Print):October 1, 1993Publication History Published online1 May 2002Published inissue 1 October 1993https://…
Article Constitution and Thermodynamics of Fe - Nd Alloys / Konstitution und Thermodynamik von Fe — Nd-Legierungen was published on October 1, 1993 in the journal International Journal of Materials Research (volume 84, issue 10).
Abstract Studies were carried out to develop a mathematical model based on experimental results to correlate agitation and other polymerization parameters with the particle size of PVC and to specify the limits of agitation speed within the defined agitation system. Computer regression analysis of about 30 vinyl chlor…
Abstract An analysis is presented of the process of die drawing isotropic polymers, in the form of circular rods, to produce highly oriented materials with enhanced mechanical properties. The stresses in a small element of material undergoing the drawing process have been analyzed using a force‐equilibrium approach an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of excited hydroxyl radicals in high-energy-electron-irradiated ice at very low temperatureTetsuo Miyazaki, Shigeru Nagasaka, Yasunobu Kamiya, and Katsumi TanimuraCite this: J. Phys. Chem. 1993, 97, 41, 10715–10719Publication Date (Print):October 1, 1993Publication…
Abstract The linear expansion and contraction in the principal planar directions of poly[1‐(trimethylsilyl)‐1‐propyne] film were measured concurrently with the sorption of n ‐nonane at 35°C. After the first sorption cycle, in which the polymer exhibited markedly nonisotropic volumetric dilation, the polymer expanded a…
Fangite is decribed on the basis of one specimen found in a sulfide ore stockpile at the mine. It occurs in a vug with pyrite and other sulfide material of complex composition. A single-crystal x-ray diffraction study shows fangite to be orthorhombic, space group Pnma, with unit-cell parameters a=8.894, b=10.855, c=9.…
Abstract α,ω‐Divinyl‐terminated polydimethylsiloxane polymers with low polydispersivity were synthesized via anionic polymerization of hexamethylcyclotrisiloxane (D 3 ). Five “monodisperse” polymers with different molecular weights were hydrosilylated with tetrakisdimethylsiloxysilane in the presence of platinum catal…
The electronic structure of the fcc Fe~Pd alloy system is investigated by band structure calculations employing the augmented spherical wave (ASW) method. The three compositions Fe3Pd, FePd and FePd3 are studied assuming the ordered CU3Au and the CuAu structure respectively. The total energy is computed as a function…
Cyclic fatigue crack growth behavior has been investigated in 9 mol% Ce‐TZP ceramics with grain sizes varying from 1.1 to 3.0 μm. To ascertain the interaction between crack resistance curve behavior and cyclic fatigue crack growth, cyclic fatigue tests were conducted with short double‐cantilever‐beam specimens in two…