Materials Literature
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Surface-stabilized ferroelectric liquid crystals (SSFLC) used with high-pretilt aligning film rubbed in a parallel direction showed three states, C1U, C1T and C2, which exhibited different optical properties. The temperature dependence of the memory angles of these states was measured for eight kinds of SSFLC sample c…
Thermo‐calc computations have been made for the iron‐rich corner of the system Fe‐Cr‐Mo‐W‐V‐C to obtain phase equilibria for AISI M2 high‐speed steel (German designation S‐6‐5‐2). The calculations describe the main transformation temperatures of this steel with good accuracy. The phases which are present during austen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMixed-valence lanthanum titanium (III/IV) oxosilicate La4Ti9Si4O30. A novel perrierite-related compound, La4Ti(Si2O7)2(TiO2)4m (m = 2), with a quasi-two-dimensional rutile-based structureShumin Wang and Shiou Jyh HwuCite this: J. Am. Chem. Soc. 1992, 114, 17, 6920–6922Public…
The temperature dependence of the d.c. conductivity of electrochemically polymerized polypyrrole films having different percentage of BF¯ ions has been investigated in the temperature range 77–300 K. It is found that reasonable values of Mott's parameters are obtained for films having low doping level.
The requirements for electromagnetic interference (EMI) shielding in aerospace structures are more complicated than those for ground structures because of their weight limitations. As a result, the best EMI shielding materials must combine low density, high strength, and high elastic modulus with high shielding abilit…
Abstract The reaction between CH 2 (X̃T 3 B 1 ) radicals ( 3 CH 2 ) and O 2 3 CH 2 +O 2 →products, has been studied in a discharge flow reactor with Laser Magnetic Resonance (LMR) detection of 3 CH 2 and OH radicals and Electron Spin Resonance detection of O and H atoms. From the measured concentration‐versus‐time pro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCombined DeSOx/DeNOx reactions on a copper on alumina sorbent-catalyst. 3. DeNOx behavior as a function of the surface coverage with sulfate speciesGabriele Centi, Nello Passarini, Siglinda Perathoner, Alfredo Riva, and Giuseppina StellaCite this: Ind. Eng. Chem. Res. 1992,…
Abstract Strain rate and temperature dependent constitutive equations are proposed for polymer materials based on existing isotropic formulations of viscoplasticity. The proposed formulations are capable of simulating some of the important features of deformation behavior of amorphous and semicrystalline polymers. The…
Photoluminescence emission spectra and diffuse reflectance absorption spectra were measured on phosphors composed of ternary sulfide hosts with the Th 3 P 4 , calcium ferrite, spinel, and thiogallate structure types each activated by Eu 2+ , Ce 3+ , Ho 3+ , and Mn 2+ . Fourteen of the sixteen materials gave a luminesc…
Abstract Many engineering polymers such as polyethylene undergo cold drawing. Consequently, a slowly growing crack in polyethylene is preceeded by a process zone consisting of drawn material. The crack and the process zone are considered to be a single entity called the Crack Layer (CL). The equilibrium size and shape…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOne-electron activation and coupling of ethene by rhodium(II) porphyrins: observation of an .eta.2-ethene-metalloradical complexAndrew G. Bunn and Bradford B. WaylandCite this: J. Am. Chem. Soc. 1992, 114, 17, 6917–6919Publication Date (Print):August 1, 1992Publication Histo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochromic and fluorescent probe studies in glassy polymer matrices. 5. Effects of physical aging on bisphenol A polycarbonate and poly(vinyl acetate) as sensed by a size distribution of photochromic probesJ. Scot Royal and John M. TorkelsonCite this: Macromolecules 1992,…
The electrical conductivity and Seebeck coefficient have been measured for pure and Li- or Al-doped CuO. The sign of the Seebeck coefficient of all samples shows p-type semiconducting properties in all temperature and oxygen partial pressure ranges employed in this measurement. The temperature dependence of electrical…
Abstract Polymer blends were prepared in the whole composition range using polymers of different polarity. Mechanical properties were characterized by tensile measurements. Surface and interfacial properties were measured and calculated and parameters characterizing the miscibility were determined. A correlation was f…
Two Curie temperature Tc peaks in differential scanning calorimetry (DSC) are observed in a well-crystallized, nonpoled film of a ferroelectric copolymer of vinylidene fluoride and trifluoroethylene [P(VDF-TrFE)] when it is reannealed at temperatures near Tc. The DSC peak at higher Tc shifts to higher temperature with…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew type of pattern formation in polymer mixtures caused by competition between phase separation and chemical reactionHajime Tanaka, Takashi Suzuki, Takafumi Hayashi, and Toshio NishiCite this: Macromolecules 1992, 25, 17, 4453–4456Publication Date (Print):August 1, 1992Publ…
Abstract Spectroscopic and potentiometric studies of Ag(I) binding by tris‐bipyridine strands indicate that the formation of trinuclear silver trihelicates is a process displaying positive cooperativity.
We investigated the characteristics of calcium phosphate cements (CPC) prepared by an exothermic acid–base reaction between NH 4 H 2 PO 4 ‐based fertilizer (Poly‐N) and calcium aluminate compounds (CAC), such as 3CaO · Al 2 O 3 (C 3 A), CaO · Al 2 O 3 (CA), and CaO · 2Al 2 O 3 (CA 2 ), in a series of integrated studie…
Newly developed methods for performing ab initio total-energy calculations on parallel computers have been used to study the formation and migration energies of lithium Frenkel defects in Li 2 O. The calculations, based on density functional theory and pseudopotential-plane-wave techniques and performed on large perio…
The oprO gene of Pseudomonas aeruginosa codes for a polyphosphate-specific porin and terminates 458 bp upstream of the start codon for the phosphate-specific porin OprP. OprO was found to be expressed only under phosphate-starvation conditions in both wild-type and oprP::Tn501 mutant P. aeruginosa strains. However, un…