Materials Literature
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Abstract When certain substances, notably waxes, are incorporated into rubber during vulcanization, the surface of the vulcanized rubber may subsequently become covered by a film of the substance diffusing out. This phenomenon, known as blooming, depends on the substance being soluble at the vulcanization temperature…
Abstract The responses of a polymer flame to changes of specimen diameter, ignition position, and stability of the burning surface were determined. These extrinsic flame parameters restricted the transport of oxygen from the environment to the burning surface. With increasing restriction the oxygen demand from the env…
Experimental results are presented for impact of two parallel plates of 6061-T6 Aluminum, skewed at an angle of 26.6° from the axis of the projectile. A transverse displacement interferometer (TDI) [1] with a 200 lines/mm grating is used to monitor the transverse motion of the rear surface of the aluminum target plate…
Luminescence of is six times as bright as that of under 365 nm light excitation at room temperature, but it suffers from thermal quenching at higher temperatures. The quenching is mainly caused by non‐radiative relaxation from the emitting states. Energy diffusion among the lowest excited states, , to sinks is a main…
Abstract Fourier transform infrared spectroscopy has been used in conjunction with differential scanning calorimetric measurements to investigate the nature of molecular degradation and its effect on the phase transition temperatures in irradiated polytetrafluoroethylene (PTFE). Both the 19 and 30°C transitions are ob…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpin-state isomerism of tris(2-picolylamine)iron(II). The diiodide and the hydrated dichlorideBradley A. Katz and Charles E. StrouseCite this: Inorg. Chem. 1980, 19, 3, 658–665Publication Date (Print):March 1, 1980Publication History Published online1 May 2002Published iniss…
The crystal structure of the high-temperature form of K2SO 4 was redetermined from three-dimensional X-ray diffractometer data at 1073 K and refined to an R value of 0.086 for 66 observed reflexions. The structure belongs to the hexagonal space group P63/mmc, with a = 5.947 (2), c = 8.375 (3) A, Z = 2, and D x = 2.26…
Abstract The crystal structures of the α and β forms of Dl-methionine have been refined by block-diagonal least-squares calculations using three-dimensional X-ray data to R=0.118 and 0.088 respectively. The structures of both the forms are essentially the same as those previously reported by Mathieson (Acta Crystallog…
Spatial (radial and longitudinal) yield spectra for electron energy degradation in molecular nitrogen gas for 25‐eV to 10‐keV incident electrons have been generated by using a Monte Carlo technique. These spatial yield spectra associated with the electron degradation process can be employed to calculate a ‘yield’ for…
On the basis of different surface treatments of a Type 316 stainless steel, results of protective film composition as obtained by Auger electron spectroscopy (AES) are related to resistance to initiation of crevice corrosion. The nickel content of the protective film was similar after all treatments, whereas the chrom…
Abstract A recent, corrected thermodynamic equation for the Gapon cation exchange selectivity coefficient produces a relation between the exchangeable sodium ratio (ESR) and the sodium adsorption ratio (SAR) that is indistinguishable from the widely used, empirical ESR‐SAR relation when SAR ≤ 40. In this sense, the th…
Thermal changes occurring during the setting of restorative materials have been measured accurately using a differential scanning calorimeter. The results were used to evaluate setting characteristics. The heat of reaction and rate of heat output may be significant in determining thermal damage to the pulp. The heat c…
A measurement of electric current is made on polypyromellitimide films of 25 µm thickness at temperatures of 120-180°C and electric fields 4-500 kV/cm over a time range of 10-3600 s. Since the low field conduction has been confirmed to be ionic, an attempt is made to fit the field-current plot to the theoretical curve…
SUMMARY Recent developments in the application of the SEM to semiconductor assessment are described. Formulae are presented for the calculation of the mean carrier density injected by the electron beam. A procedure for the correction of diffusion length measurements for surface recombination is outlined. Measured diff…
Abstract Potentiometric titration and ion adsorption data were analyzed according to theory which treats soils as mixtures of permanent and variable charge minerals. Evidence of permanent positive charge was found in a Spodosol and two Oxisols. Surface areas calculated from negative ion adsorption below and above the…
Abstract Four types of magnesium hydroxide with different particle and crystallite sizes and different degrees of agglomeration were added at amounts up to 60% by weight to polypropylene to obtain a series of composites. The burning characteristics, tensile yield strength, flexural modulus, notched Izod impact strengt…
Abstract The characteristic energy losses suffered by a 20 keV electron beam through thin films of some transition metals (Sc, Y, Zr, Hf) and of their oxides are measured using a magnetic spectrograph up to 50 eV. The energy loss function — Im 1/ε and the complex dielectric constant are calculated. It is shown that th…
Infrared and Raman spectra in the ferroelectric phase of BaTi${\mathrm{O}}_{3}$ are compared. Inconsistencies about mode coupling are discussed. The mode-coupling formalism has been successfully used by several authors to explain the Raman data but the calculation of an infrared spectrum based on Raman parameters did…
Abstract Rare earth metal (Dy 3+ , Er 3+ , Eu 3+ , and Sm 3+ ) salts of copolymers of methyl methacrylate–methacrylic acid, styrene–acrylic acid, 1‐vinylnaphthalene–acrylic acid and 1‐vinylanthracene–styrene–acrylic acid were prepared. The fluorescence of these polymer salts under ultraviolet excitation was investigat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAxial ligation constants of iron(II) and cobalt(II) "capped" porphyrinsPaul E. Ellis Jr., Jack E. Linard, Thomas Szymanski, Robert D. Jones, John R. Budge, and Fred BasoloCite this: J. Am. Chem. Soc. 1980, 102, 6, 1889–1896Publication Date (Print):March 1, 1980Publication Hi…