Materials Literature
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ゾーン延伸を融点付近で行う高温ゾーン延伸法で得られたナイロン6繊維の高次構造及び力学的性質を延伸温度との関係で検討し, さらに繊維の高強度・高弾性率化を試みた. 190℃から210℃までの温度域では延伸温度の上昇につれ延伸倍率, 複屈折, 結晶化度, 非晶配向係数, 及びヤング率はしだいに増加し, 210℃で延伸した繊維の延伸倍率は5.3倍, 複屈折は56.3×10-3, 結晶化度は51%, 非晶配向係数は0.57及びヤング率は5.9GPaである. 一方, 210℃以上の延伸では延伸倍率は急増するが, 複屈折, 非晶配向係数, 及びヤング率は著しく低下する. 215℃で延伸した繊維では延伸倍率は7.8倍, 結晶配向係数は0.860…
A stainless steel reactor has been used to investigate the reactions of mono-, di-, tri- and tetraamines, amino alcohols and amino ethers in degassed aqueous solution at 240–300 °C. The predominant reactions involved nucleophilic substitutions, where the amino nitrogen acts as the nucleophile, and not solvolyses. With…
An experimental study has been made of the effects of alloying elements and austenite destabilization heat treatment on the graphitization in the as-cast and heat treated condition, of a high chromium cast irons containing 3.8%C-11%Cr-2.3%Si-5.5%Ni-1.3%Mn-1.2%Mo as hypereutectic alloy and 3.4%C-7.5%Cr-2.5%Si-1%Mn-1.3%…
Results are presented of measurements of the non-linear dielectric effect on approaching the critical consolute point in a solution composed of a liquid crystal (MBBA) and a non-mesogenic component (isooctane). The coordinates of the critical point are T c ≈ 2°C and x c ≈ 0.77 mole fraction of isooctane. The exponent…
Powder blenders are used in nuclear fuel fabrication facilities to blend dry low-enriched uranium (LEU) oxide powder to achieve uniform physical and chemical characteristics as required by product and process specifications. Blenders rely principally on moderation control for nuclear criticality safety and are, theref…
ABSTRACT The X‐ray scattering curves for vitreous SiO 2 and B 2 O 3 are obtained in a vacuum camera, using monochromatic Mo and Cu radiation. A Fourier analysis of the scattering curve gives directly a curve representing the distribution of neighboring atoms about any one atom. For SiO 2 , the distribution curve estab…
The buckling strength and behavior of the simply-supported rectangular FRP plate with a centrally located hole under uniaxial and biaxial compressive loading is elucidated as the numerical results of FEM. The composite materials consisting of carbon-fiber/epoxy are treated as the case of angle-ply and cross-ply orthot…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-pressure studies of photoluminescence and thermoluminescence of copper and chloride doped zinc sulfide phosphors using laser selection excitationJ. M. Lang, Z. A. Dreger, and H. G. DrickamerCite this: J. Phys. Chem. 1992, 96, 1, 85–89Publication Date (Print):January 1,…
塗膜下めっき腐食先端におけるZnの腐食反応を検討し以下の知見を得ることができた.(1)乾湿繰返し及び濡れ環境下における塗膜下腐食先端では以下のめっき腐食反応が起こる.(めっき腐食反応)めっき上におけるアノード反応: Zn→Zn2++2e-めっき及び近傍の地鉄上におけるカソード反応:1/2O2+H2O+2e-→2OH-(塩基性塩化亜鉛の生成反応)5Zn2++2Cl-+8OH-→ZnCl2・4Zn(OH)2(めっき腐食反応のOverall)5Zn+5H2O+5/2O2+2Cl-→ZnCl2・4Zn(OH)2+2OH-(2) in-situ pH測定によりZnCl2・4Zn(OH)2形成層内は弱アルカリ性(pH=8~9)になっていること…
The effect of fiber coating on the residual thermal stresses, interface, and mechanical properties of CVD-(C, SiC) coated Nicalon fiber-reinforced alumina matrix composite were studied. Using a tri-cylindrical model, the residual thermal stresses caused by the mismatch of their thermal expansion coefficients and the m…
The thermal decomposition of polyvinylbutyral (PVB) and polyvinylbutyral/PLZT, PMN dielectric powder composite was studied using pyrolysis gas chromatograph method. On thermal decomposition of only PVB, at 255°C n-butanal was begun to eliminate and then many gas products which were n-butanal, acetaldehyde, 2-butenal,…
Relaxation in electromigration is one of the most important factors which determine the lifetime of a conductor carrying a pulsed current. The purpose was to clarify the mechanism of this relaxation. During low-frequency (DC to mHz) pulse-migration tests, an extremely slow relaxation was detected in Al conductor resis…
Previous calculations of inner shell cross sections used in quantitative microanalysis have neglected transitions to discrete states that appear in spectra as white lines. White line are especially prominent in L23 edges from 1st and 2nd row transition elements and M45 edges in rare earth elements. These discrete feat…
Samples of low- and high-density polyethylene (PE) and polypropylene (PP) have been treated with chlorosulphonic acid at room temperature for various periods of time. Optical microscopy showed that the chlorosulphonic acid penetration rate was constant with time in bulk low-density PE. The treated polymers became blac…
Fiberglass batt insulations intended for use in buildings are labeled with an R-value and a thickness at which the R-value is achieved. In some cases the insulation is installed in such a way that the label thickness is not achieved. The material R-value of fiberglass batts installed at less than full thickness will b…
Line charge, which is trapped after opening the line circuit breaker of a long overhead transmission line or power cable, is discharged through magnetic voltage transformers (VTs) or shunt reactors, if either is connected to the power line or cable. Although this duty is very important for a VT, there is no descriptio…
Various parameters relevant to the puncture resistance of protective clothing materials were studied. The experimental set-up was installed in an Instron testing machine. Testing was performed in a compression mode. A point was installed in a 890-newton (200-lb) load compression force cell in the movable arm of the ma…
Water trees in crosslinked and uncrosslinked polyethylene are easily visible under the microscope, and often appear to show some structure. Thus regions of greater water density have sometimes been termed channels. However this terminology cannot be taken to indicate the presence of hollow tubes since no cracks or cra…
Growth mechanism of plagioclase crystals from a basaltic melt of tholeiite type prepared by chemical reagents was studied by using the isothermal-dropping technique with iron and platinum capsules. Produced phases are plagioclase, olivine, pigeonite and augite. Crystal morphology of plagioclase varies from prismatic t…
Se pone de manifiesto la idoneidad de la técnica de calorimetría diferencial de barrido para la caracterización de materiales. Se presentan ejemplos específicos de aplicación de dicha técnica en el estudio de los fenómenos ligados a la transición vitrea y cinética de cristalización de vidrios calcogenuros y metálicos…