Materials Literature
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A new concept of the nature of the α1-relaxation mechanism of high-density polyethylene is proposed. This concept is based on the mechanical properties observed in the α-temperature range for as-grown single crystal mats and for samples of bulk crystallized material. The decomposition of the α-multiple-relaxation proc…
Abstract Pulse pile‐up, dead time, escape peaks, background, and peak overlap in Si(Li) spectra are discussed in relation to microprobe analysis, and procedures for carrying out the necessary corrections for quantitative analysis of elements of atomic number 11 to 30 are described. The accuracy is generally comparable…
Sputter deposition of Mo atoms on W substrates (and vice versa) was shown to form uniform overlayers. Such overlayers are ideally suited for studies of the escape length of Auger electrons. The results show that the escape length increases with Auger electron energy as expected. In both Mo and W the escape length of 4…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTActivation of homogeneous catalysts by polymer attachmentRobert H. Grubbs, Carl. Gibbons, LeRoy C. Kroll, Wesley D. Bonds, and C. H. BrubakerCite this: J. Am. Chem. Soc. 1973, 95, 7, 2373–2375Publication Date (Print):April 1, 1973Publication History Published online1 May 200…
Abstract Systematic discrepancies between the experimentally observed phonon dispersion law and that predicted by the theory of the lattice with polarizable ions in the short wavelength region are discussed. The discrepancies appear to be due to the quadrupole deformation of ions, primarily of anions. The adiabatic la…
Summary Wool samples from 47 Barki yearlings were taken from five positions during two years to study the variability in the fleece, the cause of variability and associations between different fleece traits. Statistical analysis has indicated the following significant points. An antero-posterior gradient occurred in t…
Triallyl cyanurate (TAC) and triallyl isocyanurate (TAIC) are thermosetting monomers with interesting interrelations: Calorimetry and infrared spectrophotometry were used to investigate the influence of atmosphere and initiator on the thermal events. The large extents of reaction observed during polymerization of TAC…
Partially oxidized tin(II) niobate and tantalate pyrochlores are homogeneous cubic phases. They have been shown by Mössbauer 119 Sn spectroscopy to contain both Sn(II) and Sn(IV). Each valency state is segregated on its own, crystallographically distinct sublattice as a consequence of the size disparity of Sn 2+ and S…
Abstract Abnormal scatterings of X-rays take place between Bragg spots. Their study in hydrated Mg- and Ni-vermiculites shows that they appear in reciprocal space in the form of modulated lines, elongated along the Z * axis. These scatterings demonstrate a two-dimensional organization of the compensating cations and o…
Abstract Urethane elastomers with a wide range of properties were prepared by reaction of toluene diisocyanate, diphenylmethane diisocyanate or an aliphatic diisocyanate with a series of castor oil derivatives. The castor derivatives included amides prepared by reaction of castor oil with mono‐ or dialkanolamines, ami…
Gas phase hydrogen permeation studies were conducted on hollow, cylindrical membranes of triply zone-refined alpha iron, AISI 304 austenitic stainless steel, and AISI-SAE 4130 steel in both the normalized (ferrite and carbide) and quenched and tempered (martensite) conditions. Membrane temperature was varied from less…
The results of an electrochemical investigation of the corrosion behavior of reactor structural materials determined both in and out of reactor are presented. Electrochemical kinetic measurements in and out of reactor were fairly difficult to obtain because of the high purity (and associated poor conductivity) of the…
Electromigration in 525 AA Au films has been studied by transmission electron microscopy during the actual passage of current. The effects of electromigration were the growth of voids near the cathode end and the growth of hillocks near the anode end of the test strip. The hillocks were rounded in shape with heights u…
Blends were prepared with high-modulus “filler polymers,” polystyrene, polyamide, and poly(methyl methacrylate) dispersed in a low modulus matrix of ethylene/vinyl acetate copolymer. The modified Kerner equation was applied to dynamic mechanical data obtained on these blends, which may be considered to be model system…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic structure of silane hydride anion (SiH5-) and model studies of inter- and intramolecular exchange in pentacoordinate silicon species. Ab initio investigationDouglas L. Wilhite and Leonard. SpialterCite this: J. Am. Chem. Soc. 1973, 95, 7, 2100–2104Publication Date…
We have undertaken a theoretical study of the effect of magnetoelastic interactions on ferromagnetic resonance in thin films as a possible mechanism for an appreciable anisotropy in resonance linewidth. This study is based on a formalism developed by Tiersten, which is exact within the framework of the quasistatic app…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactivities of polystyrene and polypropylene toward tert-butoxy radicalEtsuo Niki and Yoshio KamiyaCite this: J. Org. Chem. 1973, 38, 7, 1403–1406Publication Date (Print):April 1, 1973Publication History Published online1 May 2002Published inissue 1 April 1973https://pubs.a…
Self-association by hydrogen bonding in the case ot pyrrole was studied by i.r. spectroscopic methods. The fundamental first and second overtones of the NH stretching vibration were measured at different concentrations and at temperatures ranging from 22 to −190 °C. The existence of at least two associated species in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTESCA [x-ray photoelectron spectroscopic] study of the sulfur-nitrogen bond in sulfimidesCraig E. Mixan and Joseph B. LambertCite this: J. Org. Chem. 1973, 38, 7, 1350–1353Publication Date (Print):April 1, 1973Publication History Published online1 May 2002Published inissue 1…
Two silicon carbides with different fracture surface energies were subjected to increasingly severe thermal shock; the damage was monitored by changes in the specific damping capacity, elastic modulus, and fracture strength. The fracture strength followed predicted trends, but the strength losses did not correlate wit…