Materials Literature
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Abstract The environmental stress‐cracking behavior of poly(ethylene terephthalate), PET, has been studied by exposing PET sheet samples to a stress‐cracking liquid, at constant stress, for various periods of time. Samples evaluated are of equivalent molecular weights but vary in copolymer concentrations. The characte…
Dielectric properties of a polymer-dispersed liquid crystal (PDLC) film comprising of liquid crystal, octyl cyanobiphenyl (K-24) and polymethyl methacrylate (PMMA) are reported as a function of frequency (100 Hz-1.0 MHz) in the temperature range of 25°C to 45°C. A dielectric dispersion in the low frequency region (∼1…
As part of research on corrosion phenomena in the oxygenfree high conductivity (OFHC) copper pipes of the stator cooling circuit of a power plant turboalternator and the possibility of using copper inhibitors, some prefilming systems have been investigated, taking the common treatments with benzotriazole as a starting…
Abstract The miscibility behaviours of thermoplastic polyurethane elastomers (TPUs) with chlorine‐containing polymers were studied. Four kinds of TPUs containing 20, 40, 60 and 80wt% of poly(caprolactone) (PCL) diol as a soft segment were used for blending. Poly(vinylidene chloride‐co‐vinyl chloride) (P(VDC‐VC)) with…
Discusses the AC dielectric breakdown of alumina, aluminium nitride and cordierite glass ceramics (MgO-Al/sub 2/O/sub 3/-SiO/sub 2/) at room temperature. The importance of specimen shape, thickness, surface finish and test conditions are assessed. For dielectric breakdown tests specimens were prepared in the form of 2…
Many factors influence the preparation and quality of graphite targets for 14 C accelerator mass spectrometry (AMS). We identified four factors (sample size, H 2 pressure, catalyst temperature and pretreatment time) as potentially critical, and investigated their effects on two particular characteristics: the integrat…
Inductively coupled argon plasma spectroscopic analysis was used to quantify titanium, aluminum, and vanadium corrosion products released by superficial layers of identically shaped commercially pure titanium and Ti-6A1-4V alloy dental implants. Halves of each of two originally sterile groups were analyzed directly fr…
The principal mission of the Penetration Mechanics Branch (PMB) of the Terminal Ballistics Division (TBD) of the Ballistic Research Laboratory (BRL). Aberdeen Proving Ground, MD, is research and development leading to improvements in the terminal ballistic performance of kinetic energy (KE) long rod penetrators. This…
The addition of Cu greatly improve the hot workability of cast Pr(Nd)FeB magnets, which makes possible the production of aligned magnets by hot deformation of the cast structures. Substantial amounts of a liquid phase identified as the Pr (Nd)-rich phase are extruded from these materials during hot deformation. Howeve…
Cobalt ferrite has the so-called inverse spinel structure, with one-half of Fe3+ions on A sites and the rest, together with Co2+ions, on B sites at room temperature. The cation distribution of the cobalt ferrite, however, has been reported to change through heat treatments. During the head-treatment, magnetic and elec…
The di-µ-oxo technetium(VI) complexes [{TcN(S2CNEt2)}2(µ-O)2]1, [{TcN(S2CNC4H8)}2(µ-O)2]2, [AsPh4]2[{TcN(CN)2}2(µ-O)2]4 and [AsPh4]2[{TcN(edt)}2(µ-O)2]5(H2edt = ethane-1,2-dithiol) have been prepared either by reaction of [{TcN(OH2)3}2(µ-O)2]2+ or Cs2[TcNCl5] in Na4P2O7 solution with the appropriate ligand. The ESR sp…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
Regular well-faceted crystals located on the inner side of homogeneous poly(p-phenylene) films with a relatively large degree of polymerisation have been prepared by electrochemical oxidation of benzene in concentrated H2SO4 without adding Lewis catalysts.
The tensile properties and deformed microstructures of zirconium in the annealed condition have been investigated in both the rolling (RD) and transverse (TD) directions at three strain rates of 10−4, 10−3 and 10−2 s−1 at different temperatures in the range 298–673 K in order to understand the extent of anisotropy in…
The gelation of aqueous solutions of sodium 1-(3,5-bistrifluoromethylphenylazo)-2-hydroxy-6-naphthalenesulfonate is investigated by means of 19F NMR spectroscopy.
Abstract The miscibility of blends of poly (ε‐caprolactone) (PCL)/poly(vinylidene fluoride) (PVDF) was studied by measuring the cloud point, melting point depression and crystallization kinetics. Lower critical solution temperature (LCST) behavior was observed at PCL‐rich compositions, whilst it was not observed at hi…
Oxygen self-diffusion in a barium hexaaluminate (Ba0.75Al11O17.25) single crystal has been analysed by secondary-ion mass spectrometric analysis (SIMS) after diffusion annealing the sample in 18O2. Depth profiles of the isotopic concentration in the crystal showed that oxygen penetration normal to the c axis (⊥c) was…
Development of solidification processes in rapidly supercooled one-component plasmas is studied by a Monte Carlo (MC) simulation method with a number of particles 1458. Evolutions of interparticle correlations and of local and extended bond-orientational orders are investigated microscopically. Layered structures emer…
We have developed a polymer dispersed liquid crystal (PDLC) device for operation in the midinfrared region of the electromagnetic spectrum. This device can be incorporated in thermal imaging systems that utilize pyroelectric vidicons for night vision applications. The infrared electro-optic properties of several PDLCs…
Abstract Blends containing polyethylene (LDPE, LLDPE, or LDPE‐LLDPE) with different weight percent of styrene‐isoprene‐styrene (SIS) triblock copolymers have been obtained by extrusion‐blowing. The morphology of the blends, investigated by scanning electron microcopy (SEM), has been related to composition but also to…