Materials Literature
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Abstract The effect of stretching condition on stress‐induced crystallization of amorphous polyethylene terephthalate (PET) film has been studied. Cast PET film was stretched at 85°C with stretching rates ranging from 100% per minute to 600% per minute for various stretching ratios. The stretched film samples were ann…
Abstract Electro‐copolymerization of methyl acrylate, acrylic acid, methacrylic acid, acrylamide, and methyl methacrylate with acrylonitrile onto graphite fibers has been successfully done in our laboratory. The coatings are relatively uniform and their properties, especially their modulus, can be systematically varie…
Abstract The effect of oxidative and thermal aging of EPDM raw rubber and rubber vulcanizate on gelation, network structure, and techical properties has been studied over a wide range of temperatures and times of aging. Three grades of EPDM having different types of diene have been considered. The kinetics of aging of…
Using the high-Q mechanical-oscillator technique we have measured the sound velocity and mechanical dissipation of high-purity single-crystal silicon as functions of temperature (0.005--4.2 K), frequency (0.6--6.0 kHz), and strain amplitude (${10}^{\mathrm{\ensuremath{-}}5}$--${10}^{\mathrm{\ensuremath{-}}8}$). In the…
Concentrated suspensions of submicron colloidal spheres were studied both by dynamic light scattering and by direct observation of their phase behavior. In agreement with recent theory and computer simulation, the measured dynamic structure factor developed an essentially nondecaying component, implying ``structural a…
Abstract : Measurements were conducted to determine the impedance of the electrochemical interface on rotating disk specimens of pure copper and commercial 90-10 and 70-30 copper-nickel alloys over a 28 day period while immersed in an aerated aqueous 3.4% sodium chloride solution. A sinusoidal voltage was applied to t…
The performance of 100% cotton open-end and ring spun yarns on an air-jet loom and their behavior in corduroy fabric are investigated. The amount of twist loss and the twist distribution across the fabric width are determined. The effects of changing yarn count and original twist level on the retained twist and on fab…
This paper describes a mathematical model for ferroresonant circuits that addresses some of the deficiencies of earlier analyses of ferroresonant regulators. Derived using piecewise-linear, normalized differential equations, the model accommodates nonlinear behavior and predicts circuit performance in terms of paramet…
Abstract Porous and electrically conducting clay-carbon composite, which is produced by sintering of mixtures of clay and porous carbon, shows large electrostatic capacitance (ca. 10 F cm−3). By using the composites, electric double-layer capacitors with capacitance of 2.3–3.4 F/(cm3 of the capacitor) have been prepar…
An assessment has been made of the ability of the Wet Bulb Globe Thermometer Index to predict heat stress in men wearing NBC clothing while working at a moderate to heavy rate under a range of environmental conditions. Results showed that such an Index had no predictive value under these conditions and that the work r…
Abstract New polysulfide polymers were prepared by a new process from vinyl monomers, elemental sulfur, and sodium metal in THF. The kinetic study of the reactions at −40°C has shown that the overall process can be described by the competition between a slow reaction (initiation of the monomer by the alkali metal) and…
The mechanical behavior of silicon carbide exposed to molten lithium was evaluated at exposure temperatures from 200° to 1000°C. For temperatures up to 600°C, there was little change in strength and the fracture was controlled by preexisting surface flaws on the specimen surface or edges. Above 600°C, two strength pop…
Polymer-solvent interaction parameters for the blends of natural rubber (NR) with styrene-butadiene rubber (SBR) and polybutadiene rubber (BR) are calculated using the Flory-Rehner equation by equating the network density of the vulcanizates in two solvents.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal oxidation kinetics from the viewpoint of a physicist: the microscopic motion of charged defects through oxidesAlbert T. Fromhold Jr.Cite this: Langmuir 1987, 3, 6, 886–896Publication Date (Print):November 1, 1987Publication History Published online1 May 2002Published i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe nature of simple monovalent cation-silica interaction as reflected in the spin-lattice relaxation time of sodium-23Hyun M. Jang and Douglas W. FuerstenauCite this: Langmuir 1987, 3, 6, 1114–1118Publication Date (Print):November 1, 1987Publication History Published online…
The magnetoquantum oscillations in ${\mathrm{NbSe}}_{3}$ show frequency shifts and beat structures due to interaction between the pinned charge-density-wave (CDW) configuration and the normal Fermi surface (FS). Spatial variations in the phase deformation of the CDW pinned at impurities can result in changes in the lo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTheoretical approach to corrosion resistivity of alloysMasahiro Seo and Norio SatoCite this: Langmuir 1987, 3, 6, 917–921Publication Date (Print):November 1, 1987Publication History Published online1 May 2002Published inissue 1 November 1987https://pubs.acs.org/doi/10.1021/l…
The energy loss for protons on Al, Cu, and Ag thin foils around the maximum of the stopping have been measured at two different exit angles. The bombardment energy ${E}_{\mathrm{max}}$ where such a maximum occurs is found to depend on the angle of observation, ${E}_{\mathrm{max}}$ being greater when the detector is po…
The reflection and transmission of thin-film guided waves incident at variable angles upon a variety of transverse discontinuities are analyzed. A thin film bounded by semi-infinite media is modeled by a thin film bounded by finite media, terminated at shorting planes situated parallel to and a long distance from the…
Five (2,2-dimethylchroman-6-yl)alkanoic acids were synthesized and tested for antigelling activities. It was envisioned that these agents might bind via hydrophobic bonding to nonpolar sites of the "donor-acceptor" regions of hemoglobin S. Several (2,2-dimethylchroman-6-yl)alkanoic acids containing 1-4 carbon atoms on…