Materials Literature
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Abstract The ultradrawing behavior of ultrahigh‐molecular‐weight polyethylene/low‐molecular‐weight polyethylene film specimens prepared at various concentrations and formation temperatures was studied. The critical draw ratio ( D rc ) of UL −0.7 film specimens was found to depend significantly on the formation tempera…
In this work a set of viscosity data selected from the nematic liquid crystals literature is compared with the currently accepted microscopic (molecular) theories for the nematic viscosity. It is shown that the kinetic theory of Doi [N. Kuzuu and M. Doi, J. Phys. Soc. of Jpn. 52, 3486 (1983)] and the affine transforma…
Abstract Silicone composites reinforced with short eucalyptus pulp fibers were obtained. The composites were prepared with untreated fibers and with fibers modified with a silane coupling agent, vinyltriethoxysilane, with tetrahydrofuran or ethanol as a solvent. The surface treatment improved the adhesion at the fiber…
Abstract Polymeric materials are being developed with renewable resources to promote industrial progress with environmentally friendly technologies. For this reason, polyurethane samples were prepared with 4,4′‐diphenylmethane diisocyanate (NCO/OH = 1), eucalyptus tar pitch (biopitch), castor oil as a polyol, and dibu…
Abstract The photogeneration of singlet oxygen ( 1 O 2 ) by tetrasodium salt of meso ‐tetrakis(4‐sulfonatophenyl)porphyrins (H 2 TPPS) and some of its metal complexes (MTPPS; M = Cd 2+ , Zn 2+ ), immobilized on cationically functionalized polystyrene (PS) beads, was studied. The generation of 1 O 2 was monitored by a…
Abstract The air‐side surface composition of a series of poly(ε‐caprolactone)–perfluoropolyether–poly(ε‐caprolactone) triblock copolymers with different compositions and block lengths have been studied by angle‐dependent X‐ray photoelectron spectroscopy (XPS). The weight percentage of the perfluoropolyether (PFPE) and…
Abstract Oriented PVC has enhanced properties, but on heating it begins to shrink and eventually reverts to its original dimensions. Thermomechanical analysis was used to study the effects of orientation variables and subsequent annealing or aging on the shrinkage of rigid PVC. The thermal history of the oriented PVC…
Abstract Polyester fabrics were preirradiated by electron beam in air and then grafted by acrylic acid (AA) without excluding oxygen. Effects of preirradiation dose, monomer concentration, reaction temperature, storage time, sulfuric acid, and Mohr's salt were investigated in detail and are discussed. The results sugg…
As alternative immobilization materials for Pu‐bearing nuclear waste, lead‐containing glass matrix composites with homogeneously distributed lanthanum zirconate pyrochlore particles (up to 30 % by volume) have been developed. Fabrication by hot pressing at the relatively mild temperature of 610 °C leaves the pyrochlor…
We report on magnetic tunnel junctions entirely made up of mixed-valence manganites, La 0.7 Ca 0.3 MnO 3 /La 0.45 Ca 0.55 MnO 3 /La 0.7 Ca 0.3 MnO 3 . In heteroepitaxial junctions, the different Mn 3+ /Mn 4+ mixed-valence ratios can modulate the ground states throughout the trilayer, i.e. ferromagnetic metal/antiferro…
Abstract Since hard coating such as ta:C films are of growing interest for protecting surfaces of industrial machines and high capacity tools against wear and friction or for biomedical applications, more information about the structure‐to‐property relation is required. Therefore, core level X‐ray photoelectron sprect…
Abstract The thermal properties of poly(ethylene terephthalate) (PET) conventional fibers and microfibers are measured and compared to bulk samples. It is shown that the glass transition temperature ( T g ) of the fibers can be monitored with modulated differential scanning calorimetry (MDSC). The T g region is about…
A metal–carbon nanotube (CNT) composite has been synthesized by the authors simply by dispersing CNT's in a suitable electrolyte solution and depositing the metal in an electroless manner. The thus‐obtained CNT/Ni‐P coatings exhibit superior mechanical properties such as high hardness and excellent wear resistance. Th…
The local structure of the ${\mathrm{MnO}}_{6}$ octahedron in ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnO}}_{3}$ was investigated by Mn K-edge x-ray absorption fine structure at $T\ensuremath{\approx}10\mathrm{K}$ and room temperature as a function of x $(0<~x<~0.475).$ For both temperatures,…
In the differential scanning calorimetry (DSC) scans of the annealed states of vapor-deposited, hyperquenched, and crystal-amorphized solids, the glass-softening or T g endotherm is interrupted by the crystallization exotherm, thus making the T g endotherm appear like a rounded peak. This apparent peak is occasionally…
The mechanism of energy transport in branching structures is suggestively related to the geometry of the multichromophore architecture. In organic conjugated dendrimers, both incoherent (hopping) and coherent energy transfer processes have been observed from different dendritic architectures with different building bl…
In this work, the results of a new method for the preparation of porous silicon (PS) layers with in situ simultaneous functionalization with organic molecules are reported. The molecules of interest are dissolved in the HF ethanoic solution used to prepare the PS layers by partial anodic dissolution of a Si electrode.…
The design of an advanced solid breeding blanket in a DEMO reactor requires a tritium breeder and a neutron multiplier that can withstand high temperatures and high neutron fluences, and the development of such advanced blanket materials has been carried out by collaboration between JAERI, universities and industries…
Abstract Microporous cellulose acetate membranes were prepared by a thermally induced phase separation (TIPS) process. Two kinds of cellulose acetate with acetyl content of 51 and 55 mol % and two kinds of diluents, such as 2‐methyl‐2,4‐pentandiol and 2‐ethyl‐1,3‐hexanediol, were used. In all polymer‐diluent systems,…
Second-harmonic generation has been studied for fundamental wavelengths from 720 to 1100 nm on high-quality ZnO thin films deposited on sapphire substrates by laser molecular beam epitaxy. The second-order nonlinear susceptibility components increase dramatically as the second-harmonic frequency approaches the ZnO ban…