Materials Literature
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Abstract Olefinic thermoplastic vulcanizates (OTV's) comprise rubber in the form of discrete, completely crosslinked particles uniformly dispersed in an olefinic thermoplastic matrix. By their nature, they flow like filled polymer melts: die swell is low, and shows evidence of a particle association at low shear rate…
The effects of radiation on the rare‐earth silicate, Ca 2 Nd 8 (SiO 4 ) 6 O 2 , with the apatite structure was investigated using 244 Cm doping and alpha, gamma, and electron irradiations. Amorphization of the initially crystalline material was observed to occur only in the Cm‐doped material. Alpha irradiation produce…
The magnetization density per cm3 of Ni-content of compositionally modulated Cu–Ni thin films at 5 K was found to depend on the modulation wavelength (λ) and amplitude (A) and reached ∼90% of that of pure Ni. Short-λ and low-T studies on Cu–Ni showed an inter-wavelength coupling of the moments of Ni-rich regions that…
Abstract The reaction of poly(vinyl chloride) powder with aqueous sodium hydroxide solution in the presence of quaternary ammonium or phosphonium halides yielded dehydrochlorinated products of conjugated polyene structure. The reaction was discussed in terms of a phase transfer catalytic mechanism between aqueous and…
A model for the effect of demagnetizing field caused by closed pores and grain boundaries in ferrites was developed. This paper presents the expressions to transform the magnetic properties free from the demagnetizing field into the apparent magnetic properties. The expression for the apparent permeability is\mu_{app}…
Branching ratios have been obtained for 33 lines originating from nine levels in Ar ii by Fourier spectroscopic measurements on a high-current hollow cathode. The values are compared with recent literature data.
Abstract The dc component Δ n of the electric birefringence of poly(γ‐benzyl‐ L ‐glutamate) in m ‐cresol is measured under an ac electric field at frequencies from 0.5 Hz to 200 kHz for solutions covering the dilute and semidilute regions. The dispersion curve indicates that at low frequencies Δ n decreases with incre…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical synthesis and characterization of the single-electron oxidation products of ferric porphyrinsMartin A. Phillippi and Harold M. GoffCite this: J. Am. Chem. Soc. 1982, 104, 22, 6026–6034Publication Date (Print):November 1, 1982Publication History Published onli…
Abstract Mechanisms of Mn 2+ bonding in soil organics and pure organic compounds were compared by using electron spin resonance (ESR) spectroscopy. The observation that Mn 2+ in lower‐than‐cubic symmetry produces a very broad signal was used to quantitatively determine the degree of metal complexation by organics. As…
Abstract Alkaline hydrolysis causes pitting of the surface of polyester (PET) fibers and films and improves their wettability, as indicated by contact angle measurements. The enhanced wettability is due to an increase in either the number or the accessibility of polymer hydrophilic groups to water and/or an increase i…
One major determinant of the suitability of various engineering materials for use in biological settings is the relative strength of adhesion obtained between those materials and their contacting viable phases. Maximal adhesive strength and immobility are desired for orthopedic and dental implants, for example, while…
Solute and solvent diffusion in Zr-V alloys (V∼0–2 at.%) have been studied in the temperature ranges 1166–1480 K and 1167–1476 K, respectively, using the sectioning method. With increasing V content, the diffusion parameters D0 and Q for 48V diffusion vary from 8·9 to 0·7 × 10−9 m2 s−1 and 116·55 to 94·16 kJ mol−1, re…
The vibrational level structure of the S0→S1x transition (the Qx band) and of the S0→S1y transition (the Qy band) of free-base porphine in supersonic expansions of He was interrogated by laser-induced fluorescence excitation spectroscopy. Electronic relaxation in the S1x manifold was explored by time-resolved spectros…
Abstract Silica is not an essential component in the bonding system in XNBR-jute fiber systems. Mechanical anisotropy is observable only at the higher fiber loadings (40 phr and above) in XNBR-jute fiber composites. In composites containing sufficient amounts of bonding agent and fibers for tensile-strength anisotropy…
Abstract The formation in vitro of fibrils from type I acid‐soluble calf skin collagen has been studied before and after removal of the extrahelical peptides with carboxypeptidase and with pepsin. Turbidimetric studies show that the mechanism of fibril growth in undigested collagen is similar to that in pepsin‐digeste…
Summary A method of measuring residual monomer (Bis‐GMA) is described. In addition, the percentage of residual monomer eluted into water from composite resins after setting was compared for several commercial products.
SUMMARY Destabilization of emulsion droplets is described in terms of flocculation, coalescence and adsorption processes, and then discussed with reference to various technological aspects of dairy emulsions. A semi-quantitative measurement of homogenization-induced flocculation of cream is described using measurement…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInvestigation of the conformation of elastic chains in poly(dimethylsiloxane) networks by small-angle neutron scatteringM. Beltzung, Claude Picot, P. Rempp, and Jean HerzCite this: Macromolecules 1982, 15, 6, 1594–1600Publication Date (Print):November 1, 1982Publication Hist…
We show by a variety of experiments that the magnetomechanical coupling k in Metglas 2605SC has larger values than in any other device material. Our Mössbauer experiments show that the anisotropy axis is quite well defined when compared with Metglas 2605CO. The small value of the anisotropy and the well defined axis l…
A new boundary scheme for atomic-level computer simulations in solid mechaisms has been developed which is based on the finite-element method and which provides several advantages over previous boundary schemes. This has been applied to the simulation of (001) plane two-dimensional cracks in ac-Fe having crack line di…