Materials Literature
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Fractographic features related to fatigue growth in a titanium alloy Ti–6Al–3Mo–2Cr were examined in compressor disks that had failed in service. In‐flight block cyclic loading that included hold‐time loading and variable amplitudes of vibrational loading produced fracture characteristics which mainly reflected the tw…
NADP(+)-specific isocitrate dehydrogenase (EC 1.1.1.42) was purified to homogeneity from the sulfate-reducing bacterium Desulfobacter vibrioformis, and shown to be a monomeric protein with a molecular mass of 80 kDa. The pH and temperature optima were 8.5 and 45 degrees C, respectively. The N-terminal amino acid seque…
This work continues our study of the hot melt adhesive (HMA) model published earlier [1]. This HMA model was developed based on the pressure sensitive adhesive (PSA) tack model established previously [2]: P = P 0 BD (1) where P is the adhesive bond strength, P 0 is the interfacial (intrinsic) adhesion term, B is the b…
Abstract Limiting oxygen index (LOI) value, glass transition temperature (T g ), thermal degradation profile, morphology, and tensile strength and elongation at break of the flame-retarding polycarbonate (PC)-poly(acrylonitrile- butadiene-styrene) (ABS) (7/3) blends were studied. The flame retardants used were huntite…
Abstract We have examined gamma sterilization compatibility for many of medical packaging materials. Techniques used include thermal analysis, physical testing, optical property evaluations, and failure analysis. For a variety of PVC formulations, gamma radiation often leads to discoloration. This results from conjuga…
Mono-layers of stearic and behenic acids, deposited with the Langmuir-Blodgett technique, were used as aligning films in nematic liquid crystal cells. During the filling process the liquid crystal adopts a deformed quasi-planar alignment with splay-bend deformation and preferred orientation along the filling direction…
A diffraction geometry utilizing convergent X-rays from a polycapillary optic incident on a stationary crystal is described. A mathematical simulation of the resulting diffraction pattern (in terms of spot shape, position and intensity) is presented along with preliminary experimental results recorded from a lysozyme…
The acid‐base properties of aluminum surfaces have recently attracted much interest due to their consequences on the adhesion of organic coatings. The present work deals with a novel photoelectrochemical approach to the acid‐base properties of aluminum surfaces. Passive films were considered here as wide‐gap semicondu…
Sintering and crystallization of a 23.12 mol% Li 2 O, 11.10 mol% ZrO 2 , 65.78 mol% SiO 2 glass powder was investigated. By means of thermal shrinkage measurements, sintering was found to start at about 650°C and completed in a very short temperature interval (Δ T similar/congruent 100°C) in less than 30 min. Crystall…
New poly(azomethine urethanes) (PAMU) with linear structures were prepared in the conventional literature manner by reacting 4,4′-methylene bis(4-hydroxybenzylideneaniline) and 4,4′-methylene bis(2-hydroxybenzylideneaniline) as azomethine bisphenols, with various diisocyanates such as 4,4′-methylene bis(4-isocynatophe…
Some aspects of thermal fracture mechanics of ceramics with temperature-dependent properties are studied. It is first shown that the square-root singular field still prevails in the crack tip region. However, the size of the K-dominant zone may be influenced by the effect of temperature-dependent properties. Then the…
The crack propagation behavior in piezoelectric lead zirconate titanate (PZT) ceramics is studied. The crack propagation in piezoelectric ceramics under pure mechanical loading is considered in which a mode I mechanical loading is applied by means of Vickers indentation. Anisotropy in crack propagation is characterize…
Abstract Films of PEO and PEO blends were efficiently crosslinked by exposure to ultraviolet radiation with high‐pressure mercury lamp. Photochemical crosslinking proceeded in the presence of photoinitiator such as benzophenone or pentaerythritol triacrylate. PEO networks obtained by UV irradiation in the presence of…
An experimental study of the hexacyanoferrate (II)/(III) couple at a platinum disc electrode in hydrochloric acid, in alkali metal, ammonium and tetraalkylammonium chlorides solutions is carried out. Diffusion coefficients, equilibrium potentials and transfer rate constants are determined. Our results complete those p…
ABSTRACT The burial-diagenetic trends of illite/smectite (I/S) mixed-layer clays in the Beaufort-Mackenzie Basin have been established from detailed studies of 215 core and drill-cutting samples from 22 exploratory wells onshore and offshore. Illitization in the Beaufort-Mackenzie Basin is characterized by four types…
Abstract The chemical structure of polyolefins grafted with maleic anhydride (MA) has been the subject of much speculation, but thorough experimental studies are rare. MA with 99% 13 C in the double bond was synthesized and grafted onto PE, EPM and PP in the melt and solution. 1D INADEQUATE 13 C NMR spectroscopy was u…
Previously, a series of plate impact experiments have provided evidence for the appearance of failure waves in glasses under uniaxial compression. Presented herein is a continuation of research, performed on K9 crown glass and ZF1 dense flint glass at varied shock stresses with a goal to uncover the failure wave sourc…
Polyethylene (PE) film was implanted with 1000-keV Ar+ ions to a fluence of 5 × 1014 ions/cm2 under high vacuum conditions (2.5 × 10−6 torr) and the film surface was investigated by means of microhardness and microwear measurements, and FTIR/ATR, Raman, and XPS techniques. Ion implantation significantly increased the…
A local-nonequilibrium model of the diffusion of a solute during the rapid solidification of a binary alloy is considered. The model has two characteristic parameters: the diffusion velocity through the interface V Di and the diffusion velocity in the bulk of the liquid phase V D . The influence of local nonequilibriu…
The mechanical properties of dynamic vulcanizates depend very much on the attractive forces between the thermoplastic and rubber phases. Both in situ and separately formed block and graft copolymers were successfully used to intensify these inter facial interactions in a polymer system of polypropylene and nitrile rub…