Materials Literature
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Polyolefins, such as polypropylene and polyethylene, are among the most commonly-utilized plastics in the world, but, because of their non-polar surfaces, are among the most difficult to bond with adhesives. A surface treatment is required before adhesive application to achieve good adhesion. Alkyl cyanoacrylates are…
Polyanniline films containing TiO 2 particles have been shown to be an effective medium for photo‐induced electrochromism. This effect has been utilized to achieve image storage and writing with laser light in the polyaniline films. The production of the films, their applications, and directions for future work, inclu…
A comparative study was performed on two TiO 2 (110) surfaces: one annealed in vacuum, the other annealed in hydrogen. Local geometric and electronic structures were characterized using scanning tunneling microscopy and spectroscopy, in conjunction with conventional surface analytical techniques. Each surface exhibite…
Liquid crystalline copolyesters of p-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid, with compositions 20/80 and 24/76, were studied in order to evaluate the effect of higher melting HBA/HNA copolyesters on the high temperature adhesive properties compared with data for the recently reported 73/27 system. A tetram…
It has been observed that the adhesion between vacuum-evaporated aluminum and poly(ethylene isophthalate-co-ethylene sodium sulfoisophthalate) copolymer is approximately five times greater than the adhesion between vacuum-evaporated aluminum and biaxially-oriented poly(ethylene terephthalate) film. To describe the int…
Controlling molecular orientation , especially in liquid crystals, is of particular current interest for example in the development of display technology. Here it is shown, through studying various LCs (e.g. PCH5 or Oil red O, see figure) and orientation techniques, that the alignment of the polymer chains in the alig…
Molecular-dynamics modeling has been used to study the evolution of a dislocation nanostructure from the shock compression of a vacancy cluster in a body-centered-cubic lattice. Detailed calculations have revealed the atomic displacements by which the clustered vacancies collapse. The energetics of the process were al…
Sexual reproduction and auxospore development are described for a marine species of Bacillariaceae related to Nitzschia reversa. Oogamy, recently claimed to occur in N. pungens f. multiseries, was not found. No copulation envelope is produced and reproduction is isogamous. The orientations of the auxospores and gameta…
The fracture toughness of several ceramic materials has been measured using a miniaturized disk‐bend test apparatus and methodology based on small disk‐shaped samples 3 mm in diameter. The method involves the Vickers indentation of specimens ranging in thickness from 300 to 700 μm, and testing them in a ring‐on‐ring b…
Abstract The complexes Ruhemann's Purples form with europium or terbium salts are suitable for fingerprint development on strongly fluorescent surfaces because they show enhancement of the lanthanide luminescence via intramolecular energy transfer and because the lifetime of the luminescence is much longer than that o…
Abstract The distribution of carbon black between the phases of a NR/ cis -1,4-polybutatdiene (BR) blend was studied. An N550 carbon black was added to the blend using different mixing techniques. The carbon-black distribution was determined using a variety of analytical techniques. The crystallization temperature of…
Presents the possibility of utilization of the textile heating element for designing protective clothing. Investigation of the textile heating element has been carried out and it has been found that a conductive woven fabric of specific resistance should not be higher than 4*10−2 (Ω*m). Physical behaviour of the heati…
Experimental and theoretical research on magnetostriction of nanoscale magnetic multilayers is reviewed. The importance of interfaces and the occurrence of the surface magnetostriction is emphasized. It is shown that the dependence of magnetostriction on the magnetic layer thickness is due to the magnetostrictive stra…
The recent results of C. B. Vining, W. Laskow, J. O. Hanson, R. R. Van der Beck, and P. D. Gorsuch [J. Appl. Phys. 69, 4333 (1991)] regarding the effect of grain size on the thermoelectric figure of merit of heavily doped p-type silicon germanium alloys are compared to earlier results on similar materials. The data co…
The phosphors of alkali-earth sulfides SrS:Eux (x=0.05 and 0.10 mole per mole of SrS), SrSO:Eux (x=0.05), and CaS:Eux (x=0.0005, 0.05, and 0.10) were studied by x-ray photoelectron spectroscopy. The CaS:Eu phosphors were found to be stabilized against atmospheric water vapor and carbon dioxide by annealing at high tem…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure and magnetic susceptibility of a hydrocarbon free radical: tris(3,5-di-tert-butylphenyl)methylBart Kahr, Donna Van Engen, and Prakash GopalanCite this: Chem. Mater. 1993, 5, 5, 729–732Publication Date (Print):May 1, 1993Publication History Published online1…
The effect of humidity on the physicochemical properties of nitrofurantoin anhydrate and monohydrate during grinding in a humidity-controlled system was investigated using X-ray diffraction analysis, IR spectroscopy, thermal analysis and scanning electron microscopy. Anhydrate and monohydrate were transformed into a n…
Abstract Fatigue behavior in a blend of natural rubber (NR) and polybutadiene rubber (BR) has been investigated. The energy release rates measured from load-displacement curves recorded during the fatigue test could be used to characterize the fatigue crack propagation (FCP) history of NR/BR blend. Crack propagation k…
Abstract The well‐known Frenkel‐Kontorova theoretical model is generalized by including the elastic properties of the three‐dimensional medium surrounding the discrete atomic chain considered. The generalized sinuse‐Gordon equation (SGE) and the integro‐differential equation describing the crowdion in a highly anisotr…
The high‐temperature flexural strength of hot‐pressed silicon nitride (Si 3 N 4 ) and Si 3 N 4 ‐whisker‐reinforced Si 3 N 4 ‐matrix composites has been measured at a crosshead speed of 1.27 mm/min and temperatures up to 1400°C in a nitrogen atmosphere. Load–displacement curves for whisker‐reinforced composites showed…