Materials Literature
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Prolonged photolysis of aqueous solutions containing Na3VO4, NaH2PO4, and MeOH at pH 1.8 adjusted by use of H3PO4 led to the formation of a layered vanadyl phosphate, Na(VO)2(PO4)2·4H2O 1. A single-crystal X-ray structural analysis of a dark green crystal of 1 showed that the structure contains layers of vanadium (ran…
An ablation plasma generated by intense, pulsed ion beam was used for thin-film deposition of commercially interesting material (Ba/sub x/,Sr/sub 1-x/)TiO/sub 3/ (0<x<1). The deposition has been carried out in vacuum and on the substrate at the room temperature. The deposited thin films were analyzed by using Rutherfo…
A new epoxy/episulfide thermosetting resin was evaluated, using a dicyandiamide (DICY) curing agent. The system was found to exhibit a longer pot life and prepreg storage life than the standard epoxy system. The properties are attributable to the change in reaction mechanism caused by the addition of episulfide. The r…
Benzo[b]thiophene was successfully converted to 2-(benzo[b]thieno[2,3-d]-1,3-dithiol-2-ylidene)-benzo[b]thieno[2,3-d]-1,3-dithiole (BT-TTF). Charge transfer complexes of BT-TTF with TCNQ, I3 and Sbcl6 were synthesised and their conductivities 0.4, 0.12 and 0.024 a/scm−3 respectively, were measured as compressed power…
The heterochain crosslinking theory is applied to postgel behavior in the free-radical crosslinking copolymerization of vinyl and divinyl monomers. In this context, the crosslinked polymer formation can be viewed as a system in which the primary chains formed at different times are combined in accordance with the stat…
The effect of physical ageing on viscoelastic properties was studied for semi-IPNs based on crosslinked polyurethane and poly(butyl methacrylate) taken in the ratio 75/25 by mass. The viscoelastic properties of IPNs were studied after physical ageing and after heat treatment at 60 °C. Significant changes in viscoelast…
The high-temperature titanium alloy IMI 834 was studied with regard to the stress-strain response under thermo-mechanical fatigue conditions, the evolution of the microstructure, the relevant damage mechanisms and their implications for fatigue life. For this purpose isothermal and thermo-mechanical fatigue tests were…
Longitudinal and shear ultrasonic velocities in the ternary tellurite glasses have been measured at room temperature with different percentages of the third component. The ternary tellurite glasses have the form (composition in mol%): 70 TeO2 - (30-x) V2O5 - xAnOm, where ΑnΟm is CeO2 or ZnO, and x = 3, 5, 7, 10 mol%.…
Nacre with microlaminate structure is composed of polygonal tablet of aragonite and minor organic matrix (5%). The growing surface of nacre can be diveded into two types: brick wall type and stack up type. In nacre, the crystalline orientation,size and morphology of aragonite tablet are strictly controlled. It is gene…
ポリテトラメチレンオキシド (PTMO) と三酸化タングステン (WO3) をゾルーゲル法により複合し, 透明なハイブリッドフィルムを得た. ハイブリッドに紫外線を照射すると時間とともに淡黄色から青色に変化した. これは, 無定形WO3がタングステンブロンズ構造に変化することを示す. 青色に変色した試料は暗所放置時間とともにブリーチングした. 短時間の紫外線照射・暗所放置の繰返しでも良好なフォトクロミック特性を示した. 動的粘弾性の温度依存性の測定からPTMOセグメントのミクロブラウン運動による-55℃付近のtanδピークは, WO3が15wt%までは順次低くなるが, それ以上では低くかつブロードになり高温側に移動した. 室温付近…
The corrosion behavior of polyamide plastics immersed in sulfuric acid solution was investigated. The degree of degradation was evaluated by the changes of weight, flexural strength, and molecular weight. The flexural strength rapidly decreased after the onset of immersion due to water absorption. A part of decreased…
The influences of the sintering additive content of MgAl2O4-ZrO2 (total 5-15mass% with a MgAl2O4/ZrO2 ratio 1:1) on sintering behaviors, microstructure and mechanical properties of Si3N4 ceramics were investigated. Sintering was carried out in the temperature range of 1200 to 1900°C. Densification was enhanced with in…
Structural, thermal and mechanical properties of the blend of poly (ethylene naphtalate) [PEN] and poly (ethylene terephtalate) [PET] were investigated using 1H nuclear magnetic resonance (NMR), differential scanning calorimetry (DSC) and tensile testing machine. The PEN/PET blends were obtained by melt blending (mixi…
Fluid filled cables continue to display reliable operation at high design stresses: conductor screen stresses for paper and PPL designs are 15 kV/mm and 18 kV/mm respectively. Polymeric cables, and accessories, have not been in service long enough to establish, empirically, a limiting value for the design stress as us…
Spinodal silicas, with similar properties to phase-separated glasses but showing high mechanical strength, with large pore sizes and porosities (total pore volume to total particle volume) of 0.7 or more have been produced by adding monobasic sodium phosphate and ammonium molybdate to a silica sol, drying to obtain pa…
The mechanical properties of the Ti-6Al-7Nb alloy, used to manufacture high-strength prostheses, are highly dependent on its microstructure. This work presents the microstructural changes of this alloy under isothermal hot working. It is shown that the microstructure is strongly affected by the strain rate, temperatur…
Severe pitting corrosion occurred in a horizontal steel pipeline used to transport multiphase fluid, including water, oil, and natural gas, after 2 months of service. The pitting corrosion rate was up to 42 mm/year. Chemical analysis, X-ray diffractometry, and EDAX showed that the corrosion products mainly consisted o…
PVDF/PMMAブレンドの混合比,溶融状態からの冷却速度を変化させ,X線回折により,ブレンド物の相溶性およびそのときのPVDFの結晶構造を検討した。混合比により,PVDFとPMMAが相溶した非晶状態と,ブレンド物が相分離した結果生成するPVDF(II型)の結晶構造との二形態を形成した。これら試料を熱処理(120°C)すると,PVDF/PMMA(70/30-80/20)の混合比で,PVDF(I型)の結晶構造が形成した。熱処理によりPVDF(I型)とPVDF(II型)の異なる結晶構造を形成するのは,PVDF/PMMAの相溶性が混合比で異なるため,相溶性が高い場合PVDFの結晶化速度が遅く,その結果PVDF(I型)を形成するためである…
The effect of selective removal of organic matter and amorphous and crystalline iron oxides on N2-BET specific surface areas of some soil clays was evaluated. Clay fractions from 10 kaolinitic tropical soils were successively treated to remove organic matter by oxidation with Na hypochlorite, amorphous Fe oxide with a…
In order to clarify the size effect of an interlacer and easily choose conditions to process interlaced yarns with a desired number of tangles, we made 16 interlacers with various sizes of both yarn duct diameter d and air jet nozzle diameter dn and measured the number of tangles of interlaced raw yarn. Then the numbe…