Materials Literature
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Abstract Based on the experimental mechanical characterization presented in Part I of this paper, a model allowing the prediction of the behavior of the studied semicrystalline polymer in the pre‐necking domain was constructed. The modeling of the viscoelastoplastic behavior of polypropylene (PP) was described by part…
Single-crystal X-ray diffraction data, collected from a sartorite crystal from Lengenbach (Binntal, Valais, Switzerland), yielded a ninefold superstructure: space group P2 1 /c; a = 37.71(2), b = 7.898(3), c = 20.106(8) Å, β = 101.993(7)°; R 1 = 6.08% for 6293 reflections with I > 2σ I . The sample is an N 1,2 = 3,…
The direct voltage electric strengths of several polymers are measured using a new type of environmental chamber in which a new specimen of the material can be introduced without the necessity of cooling and reheating after every voltage application. The range of temperatures at which investigations are carried out is…
Abstract This paper is concerned with the development of a hydrodynamic model for the reinforcement of rubber by colloidal fillers such as silica and carbon black. Each fractal aggregate is replaced by an equivalent effective sphere, and the reinforcing ability of the latter is estimated using the Christensen‐Lo solut…
Optimum shielding of the radiation from particle accelerators requires knowledge of the attenuation characteristics of the shielding material. The most common material for shielding this radiation is concrete, which can be made using various materials of different densities as aggregates. These different concrete mixe…
The electrical transport in multiwalled carbon nanotubes is shown to be ballistic at room temperature with mean free paths on the order of tens of microns. The measurements are performed both in air and in the transmission electron microscope by contacting the free end of a nanotube pointing out of a fiber to a liquid…
The active magnetic regenerator (AMR) uses a magnetic solid as a thermal storage medium and as a working material in a refrigeration cycle. Thermodynamically coupled to a heat transfer fluid, the regenerator produces a cooling effect and generates a temperature gradient across the AMR. The coupling between the heat tr…
Biotite was oxidized in deep saprolitic weathering profiles developed on granitic rocks in a humid temperate climate in the Youngju-Andong area of South Korea. The mineralogy and chemistry of these oxidized biotites were characterized by chemical analysis, electron microscopy, X-ray diffraction, thermal analysis, and…
Polymeric APC-CPW electrooptic modulators incorporating an inverted-rib waveguide structure were fabricated and tested for the first time. The inverted structure greatly simplifies fabrication procedures, and additionally improves propagation loss performance. Mach-Zehnder electrooptic modulators fabricated using this…
A method is described that allows the trapping charge kinetics in insulating materials during their electron irradiation in a scanning electron microscope (SEM) to be studied and the total trapped charge to be evaluated. The method consists in analyzing the leakage and the displacement currents measured simultaneously…
The crystal chemistry of 20 specimens of astrophyllite-group minerals from seven localities has been studied using a combination of single-crystal X-ray analysis of the structure and electron-microprobe analyses. Members of the astrophyllite group are triclinic ( P 1) and monoclinic ( C2/c or A 2) heterophyllosilicate…
The thermoluminescence properties of Lu3Al5O12:1000 ppm Ce crystals codoped with Zr ions in the range 50–400 ppm have been investigated, both after irradiation at low temperatures (10 K) and at room temperature. The trap depths of glow peaks at around 82, 270 and 352 °C have been evaluated by the “initial rise” method…
A study on the modeling and simulation of interlayer interaction in the multiwalled carbon nanotube (MWCNT) system is presented. We use an interlayer Morse potential previously developed from a local density approximation (LDA) treatment of a bilayer of graphite. We have fit this Morse potential to experimental high-p…
Abstract Films of ethylene‐ co ‐octene copolymer are irradiated in air after moulding between Mylar® films with electron beam at different doses. To correlate the change in structure with properties, the irradiated and unirradiated samples are characterised by FTIR spectroscopy, swelling and mechanical measurements. O…
The response of the laumontite crystal structure to hydration/dehydration was evaluated using Rietveld refinements with XRD data collected under controlled P H₂O conditions at ~28.5 ℃. Refined water contents per unit cell (unit-cell formula: Ca 4 Al 8 Si 16 O 48 ·nH 2 O) ranged between 12.5 H 2 O at 0.11 mbar P H₂O an…
A review is presented of the resonance Raman spectra from individual isolated single-wall carbon nanotubes (SWNTs). A brief summary is given of how the measurements are made. Why the resonance Raman effect allows single-carbon nanotube spectra to be observed easily and under normal operating conditions is summarized.…
Abstract Epoxy resins modified by an organosoluble phosphorus‐containing bismaleimide (3,3′‐bis(maleimidophenyl) phenylphosphine oxide; BMPPPO) were prepared by simultaneously curing epoxy/diaminodiphenylmethane (DDM), and BMPPPO. The resulted epoxy resins were found to exhibit glass transition temperatures as high a…
Solution-cast films of shape memory polyurethane are investigated by Fourier trans form infrared spectroscopy, differential scanning calorimetry, dynamic mechanical anal ysis, tensile properties, water vapor permeability, and shape memory effect tests. Samples cast at higher temperatures contain more hard segments in…
Abstract Fully miscible poly(ether imide) (PEI)/poly(trimethylene terephthalate) (PTT) blends were obtained by melt mixing in an extruder followed by injection moulding. The viscosity of PEI, represented by the pressure at the extruder output, almost halved upon the addition of only 10% PTT, allowing the use of PEI in…
Abstract The microstructures of as-cast and slowly solidified Al–Cu–Fe ternary alloys in the vicinity of the icosahedral phase region have been investigated using light microscopy and scanning electron microscopy. The chemical composition of the different phases present has been determined by energy-dispersive X-ray s…