Materials Literature
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Abstract A double bubble tubular film process to produce biaxially oriented poly(p‐phenylene sulfide) (PPS) film is described. Operating windows were developed for stable operation of both the first and second bubbles. Films produced from single bubble tubular film extrusion were largely amorphous having only seven to…
Anodic dissolution of 420 stainless steel (Fe‐13Cr alloy) in concentrated phosphoric acid, sulfuric acid, and their mixtures has been studied to determine the conditions that lead to electropolishing of the alloy in these electrolytes. A rotating disk electrode system has been employed to study the influence of electr…
The unsubstituted polyazine, -[N=CH-CH=N]X-, has been synthesized from glyoxal dihydrazone and glyoxal. An X-ray crystal structure was done on the monomer glyoxal dihydrazone; it crystallized in space group P21/a with cell constants a = 7.744 (4) Å, b = 4.113 (1) Å, c = 8.063 (4) Å, and β = 115.66 (3)° and Z = 2; inte…
The interaction of strontium overlayers with atomically clean Si(100) surface has been studied by x-ray photoelectron spectroscopy. Also studied were the effects of Sr overlayers on the oxidation of silicon at different Sr coverage (0≤θ≤1.85) and different oxygen exposure. It is found that at low coverage, θ≤1 monolay…
Phase stability of chromium films plated from chromic acid electrolyte containing formic acid is studied by means of x‐ray diffraction and transmission electron microscopy. Five process parameters of electroplating are systematically varied and three different kinds of vacuum anneal are chosen in order to induce phase…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural and magnetic characterization of electron-transfer salts of hexacyanotrimethylenecyclopropanide, {C3[C(CN)2]3}.bul.- and [Fe(C5Me5)2].bul.+ (1:1; two phases) and [Fe(C6H3Me3)2]2+ (1:2). Evidence for 1-D antiferromagnetic behavior in segregated {Fe(C5Me5)2].bul.+ c…
The first-order Raman spectra of individual 8-μm-diam PAN-derived carbon fibers which had been annealed at five temperatures from 1700 to 2800 °C are measured as a function of incident laser power from 1 to 140 mW. In all fibers studied, the Raman frequencies of the graphite G band at ca. 1580 cm−1 and the disordered-…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilver(II) tetraneopentoxyphthalocyanine and its redox chemistryGuoyi Fu, Yansong Fu, K. Jayaraj, and A. B. P. LeverCite this: Inorg. Chem. 1990, 29, 20, 4090–4095Publication Date (Print):October 1, 1990Publication History Published online1 May 2002Published inissue 1 Octobe…
Abstract Polyimide/polydimethylsiloxane (PI/PDMS) graft copolymers with various PDMS contents were prepared by polycondensation of PDMS macromonomer 1 with aromatic diamines and pyromellitic dianhydride followed by heating at 220°C. The PDMS content of the grafts copolymers was controlled by changing the average degre…
Abstract Platy (Te Puke, New Zealand), cylindrical (Spruce Pine, North Carolina), and spherical (North Gardiner mine, Huron, Lawrence County, Indiana) halloysite samples were analyzed by high-pressure differential thermal analysis (HP-DTA) to determine the effect of morphological and chemical differences on their resp…
Luminescence of Bi 3+ or/and Mn 2+ in LnMB 5 O 10 system of phosphor has been studied. Bi 3+ in LnMB 5 O 10 leads to two types of emissions, viz. emission due to (i) Bi 3+ isolated centres and (ii) Bi 3+ clusters. In LaMB 5 O 10 , Bi 3+ emission can cover longer distances (25 Å) for resonant transfer. In LaMgB 5 O 10…
Abstract A new organic polymer ferromagnet with indigo unit in the main chain was prepared and its magnetic properties were examined. Resulting polymer contained the fraction which attracted to a permanent magnet and it showed a definitive hysteresis loop at room temperature.
Abstract Plasticization of poly(ethyl methacrylate) (PEMA) by CO 2 is investigated by dielectric relaxation spectroscopy. The dissipation factor of a dielectric cell containing the film and air gaps is measured as a function of frequency (1–10,000 kHz) and CO 2 pressure (0–60 atm) over the temperature range 35–115°C.…
The existence of ternary compounds according to the formula REFe12−x Gax which for x ∼6 represents the iron-rich end of a homogeneous range has been confirmed. X-ray powder analysis of alloys annealed at 800 °C or above generally reveal isotypism with the body- centered tetragonal ThMn12 -type structure. For the alloy…
Abstract A systematic study of the mechanical properties of linear low density polyethylene (LLDPE) and high density polyethylene (HDPE) filled with cellulose was conducted. When benzoyl peroxide (BPO) was used and when the components were mixed at 160°, the yield strength of the LLDPE/cellulose composite increased by…
Based on a Landau-Ginzburg model for improper ferroelastic perovskites, we have analyzed quasi-one-dimensional (Q1D) solutions for twin boundaries (domain walls) and the associated constraints. Because of the coupling of the order parameter to the elastic strain, in general domain walls must be described by fully thre…
Des complexes métalliques de coordination entre le cuivre et la 4-n-butyl N-(4′-n-alcoxy 4-benzoyloxy salicylidène) aniline substituée par des halogènes (Cl, Br, I) ont été synthétisés. Ces composés présentent des propriétés mésomorphes et tout particulièrement, ont un comportement nématique sur un large domaine de te…
The purpose of this two-part paper is to outline a complete two-phase flow methodology for analyzing solid— liquid phase change in binary materials. The distinctive features of the two-phase model are (1) the equations for conservation of mass, momentum, species, and energy are solved for each phase in conjunction wit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOne-electron transfer processes in the reaction of indium(I) halides with substituted o-quinonesTheodore A. Annan, Raj K. Chadha, Peter Doan, David H. McConville, Bruce R. McGarvey, Andrzej Ozarowski, and Dennis G. TuckCite this: Inorg. Chem. 1990, 29, 20, 3936–3943Publicati…
A quantitative interpretation of diffuse neutron scattering has yielded an accurate description of the defect structure of CaO stabilized zirconia (CSZ) at 290 and 1550 K. The defect structure is based on the correlated distribution of two different types of microdomains within the disordered structure. The first micr…