Materials Literature
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Abstract The effects of a controlled heat‐setting treatment on the properties and microstructure of biaxially stretched poly(ethylene terephthalate) (PET) and poly(ethylene‐2,6‐naphthalene dicarboxylate) (PEN) films are described. Substantial changes in crystalline fraction, crystallite size, glass transition temperat…
Reaction of EuCl(3).6H(2)O with 3-phenyl-4-hydroxycyclobut-3-ene-1,2-dione (phenylsquarate) in methanol produces the polymeric complex {Eu(&mgr;-C(6)H(5)C(4)O(3))(2)(C(6)H(5)C(4)O(3))(2)(CH(3)OH)(2)(H(2)O)(2).(CH(3)OH)}(n)() (1) which crystallizes in the space group P2(1)/n with a = 13.4049(5) Å, b = 13.7043(7) Å, c =…
The (pyridylazo)oxime ligand (C(5)H(4)N)N=NC(=NOH)C(6)H(4)R(p), HRL (R = H, Me), has been synthesized with the objective of promoting the very rare mononuclear oximato-O coordination. The synthesis involves hydrazone nitrosation. HRL reacts with M(ClO(4))(2).6H(2)O, affording [M(RL)(2)] (M = Mn, Fe), and X-ray structu…
A simple micromechanical model is developed to predict the onset of tear propagation at slit-like damage sites (i.e., a series of consecutive aligned yarn breaks) in biaxially stressed plain weave fabrics under increasing loading. A crucial aspect of the model is the treatment of the frictional slip of yarns near the…
The first order intracellular degradation of various polyhydroxyalkanoic acid (PHA) inclusions in Hydrogenophaga pseudoflava cells was investigated by analyzing the compositional and microstructural changes of the PHA using gas chromatography, (13)C NMR spectroscopy, and differential scanning calorimetry. Two types of…
We present the results of high pressure studies of magnetization, magnetic phase transitions, and related volume anomalies for the intermetallic compound Ce2Fe17 under hydrostatic pressures up to 10 kbar. The giant negative pressure effect on the ferromagnetic ordering temperature ΘT=94 K was determined: dΘT/dP=−(38±2…
The purposes of this work were to determine: whether thickness of single layers can be used to accurately predict thickness and thermal resistance of multiple layer assemblies; and to identify variables affecting the total thickness (i.e. textile plus air layers) of bedding during simulated use. Thickness was determin…
A mixture of and was prepared from metal alkoxides and fired at 1650°C to form mullite and an glass phase. After leaching out the glass phase, crystalline mullite powder was obtained. Transmission electron microscopy examination revealed the powder to be cylindrical particles of single‐crystal mullite. A diffusion exp…
Five heats of Type 308 austenitic stainless steel were custom designed and melted with equal combined phosphorus and sulfur (P+S) levels of 0.032 wt-%, representing very low S and high P, very low P and high S, and equal amounts of each at both median and very low levels. The effect of individual P and S levels on wel…
Compounded polypropylene powders with various concentrations of corn starch were processed in a Haake torque rheometer at constant temperature, 180 °C, for different times in a closed system. A scanning electron micrograph of 5-min processed sample shows a fine dispersion of starch particles in the polypropylene (PP)…
The Raman spectrum of single-crystal tubular hydrated 10 Å halloysite obtained by Raman microscopy clearly shows differences from dehydrated or metahalloysite. The hydroxyl stretching region shows two relatively strong asymmetric bands representing multiple bands ν1 and ν2 ascribed to the outer hydroxyl groups and ν3…
Abstract Three samples of volcanic tuff were hydrothermally altered at ∼82°C in a soxhlet apparatus for periods from 745 to 2706 h. The samples correspond to partially altered specimens of volcanic tuff with 6 wt. % (T3a) and 9 wt. % (T3b) smectite and to the calcination product of the latter (T3c). The calcination tr…
Abstract Blends composed of poly(ethylene terephthalate) (PET) as the majority component and poly(ethylene naphthalate)(PEN) as the minority component were melt‐mixed in a single screw extruder at various PET/PEN compound ratios. Tensile and flexural test results reveal a good PET/PEN composition dependence, indicatin…
The synthesis and upper thermal stability of cancrinite were investigated experimentally in the system Na 2 O-CaO-Al 2 O 3 -SiO 2 -CO 2 -H 2 O at 2 kbar and in the presence of a mixed H 2 O-CO 2 fluid. Cancrinite could only be formed under water-rich conditions in this system. The breakdown of cancrinite to nepheline…
Al 2 O 3 /5‐vol%‐SiC nanocomposites have been fabricated by using pressureless sintering with MgO and/or Y 2 O 3 sintering aids and post‐hot isostatic pressing (HIPing), which circumvents the limitations of hot pressing. Al 2 O 3 /SiC nanocomposites that have been doped with 0.1 wt% MgO and 0.1 wt% MgO + 0.1 wt% Y 2 O…
A new calculation method of atomic flux divergence (AFDgen) due to electromigration has recently been proposed by considering all the factors on void formation, and AFDgen has been identified as a parameter governing void formation by observing agreement of the numerical prediction of the void with experiment. In this…
A variety of alumina‐based ceramics were evaluated for dissolution in an azeotropic aqueous hydrofluoric acid test protocol at temperatures up to 200°C. Weight change measurements and microstructure analysis showed that HF corrosion in polycrystalline aluminas generally occurred at grain boundaries by the dissolution…
The effects of 1.5 MeV Kr‐ion irradiation on seven X 2 YO 4 phases with the olivine (A 2 VI B IV O 4 ), spinel (A IV B 2 VI O 4 ), and phenakite structures have been investigated using in situ and high‐resolution transmission electron microscopy (HRTEM) over a wide temperature range (20‐873 K). At low temperatures (&l…
Ceria‐samaria is one of the most interesting of fluorite oxides since its oxide ionic conductivity is higher than that of yttria‐stabilized zirconia and other oxides. In this study, the effective index is proposed to maximize the oxide ionic conductivity in based oxides. Considering the crystallographic character of f…
For a Na0.5B0.5TiO2 single crystal the intensity variation of the satellite reflection was measured by X-ray diffraction. No hystereses were observed for the phase transitions into both the rhombohedra1 and the tetragonal phases, however there is a coexistence of both phases in the range between ∼250°C and 300°C. By f…