Materials Literature
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High inrush currents and unbalanced supply voltages are two of the major causes for failure of polyphase induction machines. While thyristor voltage controllers, sometimes called static starters, are in widespread use to limit damaging inrush currents, little attention has been paid to the use of these controllers to…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxochromium compounds. 1. Synthesis and properties of .mu.-oxo chromium-iron porphyrin and phthalocyanine compoundsDavid J. Liston, Brendan J. Kennedy, Keith S. Murray, and Bruce O. WestCite this: Inorg. Chem. 1985, 24, 10, 1561–1567Publication Date (Print):May 1, 1985Public…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic properties and zero-field splitting in high-spin manganese(III) complexes. 2. Axially ligated manganese(III) porphyrin complexesBrendan J. Kennedy and Keith S. MurrayCite this: Inorg. Chem. 1985, 24, 10, 1557–1560Publication Date (Print):May 1, 1985Publication Histo…
Certain polymerization reactions show the formation of medium molecular weights at the beginning of the reaction, although they can be considered to be polycondensations. The principle of equal reactivity of the end groups is not given in this case. Intermediates more reactive than the monomer are formed during the re…
An extensive experimental program has been conducted on intumescent systems where the components have been varied systematically. Small plates were coated with the various formulations, exposed to a heat source typical of aviation fuel fires, and the temperature-time history of the substrate recorded. Concurrently, a…
Abstract The degree of substitution (DS) and distribution of O‐acetyl groups of water‐soluble cellulose acetate (CA) were investigated by 13 C‐NMR. For this purpose, three different series of CA samples with low DS were prepared by respective homogeneous reaction, i.e., (1) deacetylation of cellulose triacetate (CTA)…
Transmission and reflection spectra in the range 0·4 to 4·1 eV have been obtained for NaxWO3 thin films as a function of x up to 0·2, and the influence of grain size has been investigated. The data were refined to yield the absorption coefficient and the real part of the dependence of refractive index on photon energy…
(1985). Degradation of Poly[vinyl Fluoride] and Poly[vinylidene Fluoride] Journal of Macromolecular Science, Part C: Vol. 25, No. 2, pp. 227-275.
Abstract Direct methods for determining the electrostatic force of interaction between molecularly smooth mica plates are compared with a less direct method (osmotic pressure) of determining the forces between particles (flat plates) in a colloidal dispersion. It is shown that macroscopic surfaces and particles exhibi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and geometry determination of cofacial diporphyrins. EPR spectroscopy of dicopper diporphyrins in frozen solutionSandra S. Eaton, Gareth R. Eaton, and C. K. ChangCite this: J. Am. Chem. Soc. 1985, 107, 11, 3177–3184Publication Date (Print):May 1, 1985Publication Hi…
Thermosetting plastic composites have been prepared with phenol–formaldehyde resins as well as unsaturated polyesters as binders and coconut hair as fibrous reinforcement. Using resole-type phenol–formaldehyde resins, the effect of coconut fiber pretreatment by NaOH, the precondensation time of the impregnated fibrous…
Abstract 1. Vulcanization by sulfur alone is faster and more efficient for ENR than for NR because isolated double bonds react more rapidly than contiguous double bonds. This vulcanization may be accelerated by sodium carbonate, which also protects the cured rubber against the subsequent effect of oxidative aging, and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTheory of the isotropic-liquid crystal phase separation for a solution of bidisperse rodlike macromoleculesTheo Odijk and Henk N. W. LekkerkerkerCite this: J. Phys. Chem. 1985, 89, 10, 2090–2096Publication Date (Print):May 1, 1985Publication History Published online1 May 200…
Three linearly arranged Cu ⊕ ions, coordinated by three parallel N 5 zig‐zag chains in such a way that each metal ion is surrounded by a trigonal planar array of N atoms, are present in the pentaazadienide complex 1 . The red crystals of 1 exhibit weak paramagnetism; the CuCu distances in the chains are the shortest…
The most abundant, long-lived stable gaseous species generated by corona discharges in SF 6 gas containing trace levels of 0, and H,0 are the oxyfluorides SOF,, SOF, and SOF 4 . Absolute energy and charge rates-ofproduction of these and the minor products SO,, OCS, and CO2 have been measured at different total gas pre…
Abstract The heat capacities of 38 semicrystalline poly(oxymethylene)s and poly(oxyethylene)s were determined by differential scanning calorimetry from 205 K through the melting transition. By comparison with the well known limiting heat capacities of the supercooled liquids and the crystals of the macromolecules it w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTheoretical study on the dimerization of silanone and the properties of the polymeric products (H2SiO)n (n = 2, 3, and 4). Comparison with dimers (H2SiS)2 and (H2CO)2Takako Kudo and Shigeru NagaseCite this: J. Am. Chem. Soc. 1985, 107, 9, 2589–2595Publication Date (Print):Ma…
Numerous copolymerizations of glycolide with β-propiolactone, γ-butyrolactone, δ-valerolactone and ϵ-caprolactone were conducted either in bulk or in nitrobenzene solution at temperatures in the range of 20–150°C. Three classes of catalysts were used, namely acidic catalysts initiating cationic polymerizations, comple…
Abstract A mathematical model is developed to describe the process of thermal regeneration in diesel‐particulate monolithic filters. The model shows that a typical regeneration cycle consists of four stages: preheating, ignition, transport‐controlled combustion, and cooling. The total regeneration time and the peak te…
The anisotropy of fracture toughness of PZT‐ and barium titanate‐based piezoelectric ceramics was studied using doubletorsion and indentation methods. The influence of elastic anisotropy and the piezoelectric effect in calculating the K c value are discussed. The fracture toughness in the polarization plane is greater…