Materials Literature
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Effective chain extenders for linear polyesters such as poly(ethylene terephthalate) (PET) and poly(butylene terephthalate) (PBT) were sought among some nitrogen-containing bisheterocycles, which were reactive with hydroxyl terminals of the polyesters to form addition linkages. Tested were such bis cyclic-imino-esters…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExperimental and quantum-chemical investigation of the magnetic exchange mechanism in a series of (.mu.-terephthalato)bis[(polyamine)copper(II)] complexesE. G. Bakalbassis, J. Mrozinski, and C. A. TsipisCite this: Inorg. Chem. 1986, 25, 20, 3684–3690Publication Date (Print):…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEpitaxial growth mechanism of diamond crystal in methane-hydrogen plasmaMinoru. Tsuda, Mitsuo. Nakajima, and Setsuko. OikawaCite this: J. Am. Chem. Soc. 1986, 108, 19, 5780–5783Publication Date (Print):September 1, 1986Publication History Published online1 May 2002Published…
ABSTRACT From more than one hundred nickel‐aluminum (Ni‐AI) bronze sand cast ship propellers, the effect of thickness on the properties of the material has been investigated. For this purpose the mechanical and corrosion fatigue properties nave been measured on pieces of material from the thickest part of the castings…
This 100-year review examines the development of electrical insulation subdivided into materials, test methods and standards.
Decarburization treatment performed by motor and transformer manufacturers often results in internal oxidation of the solute elements. The presence of subscale (zone affected by precipitation of Si-Al oxides) adversely affects magnetic properties, particularly permeability of the annealed steel. The permeability deter…
Abstract A series of di- and trinuclear copper(II) complexes containing N,N,N′,N′-tetramethylethylenediamine(tmen), N,N-diethylethylenediamine(deen), 2,2′-bipyridyl(bpy) or 1,10-phenanthroline(phen) and azide, thiocyanate or cyanate ions have been prepared and characterized by their magnetic susceptibilities, infrared…
The 13C nuclear magnetic resonance spectra of MMA-EMA copolymers have been recorded and analyzed. The carbonyl carbon resonance region contains six resonating peaks due to its sensitivity to triad concentrations. From these signals, triad concentrations were determined and compared with calculated values based on Bern…
In addition to reduction to the pole of total intensity magnetic anomalies, two new magnetic transformations, reduction to the equator and orthogonal reduction, can be used to correct the asymmetry and lateral shift of measured magnetic total field profiles. These transformations can be implemented in both space and f…
The magnetic and structural properties of melt spun MM-Fe-B ribbons, where MM stands for misch metal, were examined. It has been shown that the MM16Fe75B9ribbon can exhibit a coercive force of 9.4 kOe and an energy product of 8.1 MGOe when it was quenched at the optimum rate of 20 m/sec, in terms of quenching wheel su…
Correlation between the director reorientation and its consequent optical response time of the parallel-aligned nematic liquid crystals was investigated. This optical decay time is found to depend on the phase retardation introduced by the liquid-crystal layer. To verify theory, dependence of optical decay time on thr…
The chemical durability of five flouarozirconate glass compositions was studied. Measurements of leachant composition and solution chemistry by plasma emission spettroscopy, pH, and fluoride analysis are reported. Changes in surface structure were monitored by scanning electron microscopy, electron‐probe X‐ray analysi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of siloxane-containing bis(furans) and polymerization with bis(maleimides)Giuliana C. Tesoro and Vinod R. SastriCite this: Ind. Eng. Chem. Prod. Res. Dev. 1986, 25, 3, 444–448Publication Date (Print):September 1, 1986Publication History Published online1 May 2002Pu…
We present cw and pulsed EPR experiments on ${\mathrm{V}}^{4+}$ in the rutile and anatase phases of ${\mathrm{TiO}}_{2}$. For the rutile phase, the cw data confirm earlier results, but the relaxation data are different from those previously reported. No earlier results for ${\mathrm{V}}^{4+}$ in the unreduced pure ana…
Abstract A thermal gravimetric method was used to measure rates of decomposition of NAHCO 3 particles. Such decomposition produces a highly porous Na 2 Co 3 that reacts with SO 2 rapidly and completely at moderate temperatures. Hence, NaHCO 3 decomposition provides a reactant with attractive features for SO 2 removal.…
From the design of non-polar molecular structures exhibiting different rigid cores and isolated C=C double bonds in different side-chain positions and from investigations into the static dielectric birefringence, viscous, and all three elastic constants k 1, k 2, k 3, new, negative dielectric anisotropic nenatic lique…
The bend (K33) and splay (k11 elastic constants of octylcyanobiphenyl have been measured as a function of temperature using the electric field induced Freedericksz transition. We have made simultaneous measurements of the dielectric constants and birefringence of 8CB using a cell with homogeneous alignment. Dielectric…
Experiments on a series of pure Fe–C alloys consisting of ferrite and pearlite only have shown that the ferrite/pearlite and pearlite/pearlite interfaces are effective hydrogen trapping sites. The ferrite/cementite interfaces within the pearlite colonies, however, have little effect on the hydrogen occlusivity. With a…
The kinetics of in vitro fibril assembly of Type I collagen preparations that contain different amounts of covalently cross-linked oligomers was studied with turbidimetry. Fibril formation showed a lag phase with no solution turbidity and a growth phase with a sigmoidal increase in the solution turbidity. The length o…