Materials Literature
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This paper reports progress in measuring electric fields due to space charge in continuous dielectric media by-means of the thermal pulse method[1–3]. This work is pertinent to the study of charge injection and transport processes as well as to the study of the effects of space charge on the dielectric breakdown of el…
Thermal properties of fluorinated and unfluorinated glasses based on the systems AlF 3 ‐NaPO 3 and AlF 3 ‐CaF 2 ‐NaPO 3 were investigated. Crystallization is more distinct in glasses with a higher fluorine content. The increase in fluorine content in aluminofluorophosphate glasses increases the thermal dilatometry coe…
The FRAS3 code, developed to model transient fission‐gas behavior in oxide fuel, has been modified for application to metallic fuel. The code has been applied to analyze a series of experiments on irradiated uranium fuel, in which fission‐gas bubble distributions were measured following isothermal anneals under variou…
<div class="htmlview paragraph">Federal Aviation Administration (FAA) Advisory Circular AC 20-107A, Composite Aircraft Structure, issued in 1984 provides updated guidance material for use in demonstrating compliance with the provisions of the applicable Federal Aviation Regulations, (FAR) regarding airworthiness…
Aluminum‐tin alloys were electrodeposited onto steel from alkyl benzene, electrolytes. Bright, adherent, and coherent aluminum‐tin coatings were obtained at cathode efficiencies approaching 100%. The composition of the cathode deposit can be readily controlled by using Al‐Sn anodes of specified tin content. If the cur…
Abstract Several polymer‐metal complexes were prepared by reacting poly(vinyl carbazole) (PNVC) with copper(II) chloride, CuCl 2 .2H 2 O, in refluxing tetrahydrofurane (THF) for mole ratios of CuCl 2 .2H 2 O to monomeric unit (Cu:PNVC ratio) ranging between 0.086 and 4.98. Complexes were characterized by infrared (IR)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolution-crosslinked networks. 2. Viscoelastic behavior of guest polyisoprene in natural rubber networksBeng Teik Poh, Keiichiro Adachi, and Tadao KotakaCite this: Macromolecules 1987, 20, 10, 2569–2574Publication Date (Print):October 1, 1987Publication History Published onl…
Abstract The hole transport of trans ‐1,2‐biscarbazolylcyclobutane (CB) doped poly(bisphenol A carbonate) (PC) film has been investigated in the CB concentration range of 3.8 × 10 −4 mol cm −3 (12 wt%) to 1.6 × 10 −3 mol cm −3 (51 wt%). The hole mobility increased drastically with increasing CB concentration. The hole…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolution-crosslinked networks. 3. Dielectric normal mode process of guest polyisoprene in natural rubber networksBeng Teik Poh, Keiichiro Adachi, and Tadao KotakaCite this: Macromolecules 1987, 20, 10, 2574–2579Publication Date (Print):October 1, 1987Publication History Publ…
A transmission-electron-microscopy study has been made of early stages in the development of irradiation damage in copper-germanium alloys irradiated at temperatures from 355 K to 623 K to fast neutron doses between 1021 n m−2 and 2 × 1022 n m−2 (E > 1 MeV). The various components of the damage microstructures are ana…
Softening of thermoplastic polyurethanes (TPU) in a simulated body environment (37 degrees C n-saline) was studied as a function of composition, structure and resultant morphology of these (AB)n type block copolymers. The structural variations were attempted by changing chemical composition and molecular weight of bot…
The absorption of H 2 O on stepped and planar surfaces of SrTiO 3 (100) has been studied using soft X-ray photoemission. Valence band spectra indicate that H 2 O dissociates on the stepped surface, with an initial sticking coefficient approaching unity. In contrast, H 2 O adsorbs molecularly on the planar surface, at…
The structural and bonding properties of Ti-6Al-4V adherends, prepared by chromic acid anodization (CAA), were studied as a function of exposure in high-temperature environments such as vacuum, air, boiling and pressurized water, and steam. Subsequent to the environmental exposure, bonds were produced and the adhesive…
Abstract Polyurethane elastomers were prepared from a series of poly(ethylene oxide) samples by end‐linking the chains into “model” trifunctional networks. The molecular weight M c between crosslinks in such networks is simply the number‐average molecular weight M n of the precursor polymer. End‐linking samples separa…
The crystal structure of 4,4'-difluorobiphenyl has been determined at different temperatures between 155 and 293 K. This compound is isostructural with biphenyl (P21/a, Z = 2). We have carefully analysed the evolution of thermal motion by refining the translational and librational tensors. At any temperature, the mole…
Abstract Fluorine‐containing polyarylates having inherent viscosities of 0.2–0.8 dL/g were prepared from tetrafluoroisophthaloyl chloride and various bisphenols by low temperature solution polycondensation in chloroform with triethylamine or by two‐phase polycondensation in a dichloromethane‐water or nitrobenzene‐wate…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular and electronic structure of six-coordinate low-spin oxo-bridged dimers formed by the interaction of (.mu.-oxo)bis((phthalocyaninato)iron(III)) with nitrogen basesClaudio Ercolani, Marcello Gardini, Keith S. Murray, Giovanna Pennesi, Gentilina Rossi, and Peter R. Zw…
Given current clinical use of phospholipid bilayer structures (liposomes/vesicles) as nontoxic drug delivery vehicles, we have addressed the possibility of employing the phospholipids themselves as MRI contrast agents. To this end we have synthesized phosphatidylcholine with a nitroxide spin label replacing one methyl…
Cerium activated Y 3 Al 5 O 12 has been grown by liquid phase epitaxy (LPE) from a PbO ‐ B 2 O 3 flux. Cathodoluminescence measurements of ( Y 3 − x Ce x ) Al 5 O 12 show an internal efficiency of 6.5% at the film composition and optimal growth conditions. Numerous lanthanide ions were studied in a series of LPE film…
Various methods of determining the pemeability of textile fabrics to the passage of water vapour have been developed and described. An investigation was undertaken to compare the Canadian General Specifications Board (CGSB) Control Dish Method, the apparatus and method described by Farnworth and Dolhan (the DND Method…