Materials Literature
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The polarized Raman spectra of the single-crystalline Cs2[ZnCl4] in the frequency region Δν=0–350 cm−1 at room temperature, and the Raman spectra of the polycrystalline Cs2[ZnCl4] in the same frequency region at 293, 80, and 36 K have been measured. A complete analysis of the spectra in both the metal–ligand optical m…
Relaxation of stress in simple extension of polyisobutylene (viscosity-average molecular weight 2.3×106) has been measured at stretch ratios (λ) up to about 2. Data at 3, 25, and 50°C were reduced to 25°C. At any instant of reduced time, the dependence of stress on λ could be described by the Mooney-Rivlin equation; t…
Abstract The 110 Sn Mössbauer spectrum and the Raman phonons in polycrystalline samples of K 2 [SnCl 5 ] have been investigated in the temperature range from 4 and 150 K, respectively, to 300 K. With decreasing temperature a discontinuous increase of the halfwidth of the Sn‐Mössbauer line and a concommitant change in…
Abstract Part II discusses numerous examples of a morphological fibrillar‐to‐lamellar transformation that has reportedly been observed in stretched polymers upon additional thermal treatment (or TIC), Stretched polymers containing initially a typical fibrillar morphology for either crystallites in cold‐drawn polymers,…
One of the theories of moiré pattern prediction uses the technique of partial sum extraction in the Fourier series expansion of the transmittance distribution which is obtained as the product of composite gratings transmittances. Based on this technique a simple method for the profile prediction of moiré fringes produ…
Pentabromonitrobenzene, pentabromobenzoic acid, pentabromobenzamide, pentabromoacetanilide, barium pentabromobenzenesulphonate, 1,2,4,5 - tetrabromo -3-chloro-6-(trifluoromethyl)benzene, 2,3,5,6-tetrabromo-4-methoxytoluene 2,3,5,6-tetrabromo-4-methoxybenzamide, methyl 2,3,5,6-tetra- bromo-4-methoxybenzoate, and 1,2,5-…
A thermodynamic criterion was developed for predicting the compatibility of insulating ceramics with liquid Na and Li. Nonmetallic impurities in liquid metals were shown to have a profound effect on the compatibility behavior of ceramics. Attempts were made to identify the structural parameters which affect the corros…
Raman and ir spectra in the stretching region of all HgX2 and HgXY molecules (X,Y=Cl, Br, I) trapped in solid Kr at 20 °K are reported. Bands are assigned to modes of monomers and dimers. Bond stretching and interaction force constants are calculated and compared. The possibility of a slightly bent structure for sever…
Abstract A theory of crystallization under stress is developed about the premise that the direction a chain takes through a crystallite, relative to its end‐to‐end vector, is determined by the first few links of a chain that initially deposit onto the crystallite surface. Since these few links are quickly trapped by s…
Lysine aspartate, C 6 H 15 N 2 O 2 ·C 4 H 6 NO 4 , a crystalline complex or lysine and aspartic acid, crystallizes in the monoclinic space group P2 1 with two formula units in a unit cell of dimensions a = 5.539 (3), b = 7.848 (4), c = 15.324 (I5) A, β = 99.1 (I)°. The structure was solved by direct methods and Fourie…
Abstract This paper points out that interpretations from stress changes alone during oriented crystallization have led to widely different proposed chain conformations and consequently very different crystallization mechanisms for strain‐induced crystallization (SIC). Many of the proposals, including the one by Keller…
The filamentary growths of single crystals on material surfaces are termed whiskers. They are seen to nucleate and grow on certain electronic materials either from vapour and liquid phases or by a process induced by residual stresses in electroplated surfaces. Whisker growth does not depend on the existence of an elec…
Abstract Electron paramagnetic resonance in anisotropic magnets is analyzed. The resonance field at fixed frequency is shown to be a function of the principal values of the external susceptibility tensor and hence can be temperature dependent. The predictions of the theory are compared with data on the temperature dep…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUtility of virtual coupling in the carbon-13 {proton} nuclear magnetic resonance spectra of bis-phosphite complexes of palladium and platium. Algebraic cancellation of spin-spin couplingA. W. Verstuyft, J. H. Nelson, and L. W. CaryCite this: Inorg. Chem. 1976, 15, 3, 732–734…
The solid-state polymerization of S2N2 to (SN)x is investigated as it relates to the molecular, crystallographic, and defect structures of this superconducting polymer. The least motion principle predicts that polymerization should occur by a nonunique reaction to form cis–trans polymer chains normal to the 21 axis of…
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUse of Cryptates in Anionic Polymerization of LactonesA. Deffieux and S. BoileauCite this: Macromolecules 1976, 9, 2, 369–371Publication Date (Print):March 1, 1976Publication History Published online1 May 2002Published inissue 1 March 1976https://pubs.acs.org/doi/10.1021/ma6…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Morphology of Directionally Solidified Poly(ethylene oxide) SpherulitesAndrew J. Lovinger and Carl C. GryteCite this: Macromolecules 1976, 9, 2, 247–253Publication Date (Print):March 1, 1976Publication History Published online1 May 2002Published inissue 1 March 1976https…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFerric tris(dithiocarbamate) spin equilibrium revisited. Variable-temperature (4.2-296.deg.K) magnetic susceptibility, (30-300.deg.K) infrared, and (4.2-85.deg.K) electron paramagnetic resonance dataGretchen R. Hall and David N. HendricksonCite this: Inorg. Chem. 1976, 15, 3…
Abstract Thermally stimulated and isothermal depolarization currents of three low‐density polyethylenes are investigated in the temperature range 80–320°K. The thermally stimulated current spectra can be analyzed in terms of a continuous relaxation time spectrum. This spectrum can be resolved into three Gaussian distr…