Halato-telechelic polymers. 6. Viscoelastic properties of solutions of alkaline earth α,ι-dicarboxylato polybutadiene
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Heat capacity, relative enthalpy, and calorimetric entropy of silicate minerals; an empirical method of prediction
A procedure to estimate the standard molar heat capacity, relative enthalpy, and calorimetric entropy of silicate minerals has been devised and evaluated. These are estimated by summing, in appropriate proportions, fictive molar isobaric heat capacities, relative enthalpies, and entropies evaluated for structural comp…
Vimentin filaments are assembled from a soluble precursor in avian erythroid cells.
The synthesis and assembly of vimentin was studied in erythroid cells from 10-d-old chicken embryos. After various periods of [35S]methionine incorporation, cells were lysed in a Triton X-100-containing buffer and separated into a soluble and an insoluble (cytoskeletal) fraction. Analysis of these two fractions by two…
Processing‐Related Fracture Origins: III, Differential Sintering of ZrO 2 Agglomerates in Al 2 O 3 /ZrO 2 Composite
Large, hard ZrO 2 agglomerates remained in an Al 2 O 3 /ZrO 2 composite suspension after inefficient ball‐milling. The ZrO 2 agglomerates shrank away from the consolidated Al 2 O 3 /ZrO 2 powder matrix during sintering, producing crack‐like voids which were responsible for strength degradation.
Polypropylene/nylon 6 blends: Phase distribution morphology, rheological measurements, and structure development in melt spinning
Abstract A series of polypropylene (PP)/nylon 6 (N6) blends of composition 75/25, 50/50, and 25/75 have been prepared in a screw extruder combined with a Koch static mixer. The phase morphology was observed with a scanning electron microscope. The influence of heating in the reservoir of a rheometer followed by subseq…
Critical behavior at the nematic-smectic-Atransition in butyloxybenzylidene heptylaniline (4O.7)
High-resolution ac calorimetric, x-ray, and light-scattering measurements have been made on $\mathrm{N}\ensuremath{-}[4\ensuremath{-}(n\ensuremath{-}\mathrm{butyloxy})\mathrm{benzylidene}]\ensuremath{-}{4}^{\ensuremath{'}}\ensuremath{-}(n\ensuremath{-}\mathrm{heptyl})\mathrm{aniline}$ (4O.7) near the nematic-smectic-$…
Activity/Composition Relations among Silicates and Aqueous Solutions: II. Chemical and Thermodynamic Consequences of Ideal Mixing of Atoms on Homological Sites in Montmorillonites, Illites, and Mixed-Layer Clays
Abstract The activities of thermodynamic components of clay minerals corresponding in composition to pyrophyllite, muscovite, paragonite, and margarite were computed from chemical analyses reported in the literature assuming ideal mixing of atoms on homological sites in the minerals. These activities were then used to…
Primary and secondary structure of hamster vimentin predicted from the nucleotide sequence.
The nucleotide sequence of two recombinant plasmids containing hamster vimentin cDNA was determined. The sequence comprises 1,640 base pairs and reveals virtually the total primary structure of vimentin and a large part of the 3' noncoding region. Secondary structure prediction methods allow the characterization of tw…
E. Prince Mathematical Techniques in Crystallography and Materials Science. Berlin, Heidelberg, and New York (Springer-Verlag), 1982. viii+ 192 pp., 28 figs. Price DM 55.00 ($25.60).
E. Prince Mathematical Techniques in Crystallography and Materials Science. Berlin, Heidelberg, and New York (Springer-Verlag), 1982. viii+ 192 pp., 28 figs. Price DM 55.00 ($25.60). - Volume 47 Issue 343
Unipolarity of Tgs-crystals induced in paraelectric phase
The unipolar structure that is the steady self-biased hysteresis loop can be created by the electrothermal annealing in the paraelectric phase of pure TGS-crystals grown in the ferroelectric phase. It also occurs in X-irradiated TGS and TGS-Cr. The formation of unipolarity in all these crystals is due to the same spec…
3,7-DIHALO-2H,6H-BENZO[1,2-b:4,5-b′]DITHIOPHENE-2,6-DIONE. NEW WURSTER-TYPE ACCEPTORS ISOELECTRONIC WITH 2,6-ANTHRAQUINONE
Abstract We describe the syntheses and properties of the new Wurster-type acceptors, 3,7-dihalo-2H,6H-benzo[1,2-b:4,5-b′]dithiophene-2,6-diones (2a) and (2b), which have C2h molecular symmetry with two sulfur atoms, together with the electrical resistivities of their CT complexes.
Stabilization of polyiodide chains: structural influences in the cation as provided by the metal ion and its ligand
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStabilization of polyiodide chains: structural influences in the cation as provided by the metal ion and its ligandAlan J. Jircitano and Kristin Bowman MertesCite this: Inorg. Chem. 1983, 22, 12, 1828–1831Publication Date (Print):June 1, 1983Publication History Published onl…
The pyrolysis and nonflaming oxidative degradation of poly(vinylfluoride)
Abstract The thermal degradation of poly(vinylfluoride) (PVF) was studied under slow heating conditions to 1000°C with and without the presence of air. The degradation products, classified as low‐boiling volatiles, high‐boiling volatiles, and nonvolatile residues, were analyzed quantitatively by gas chromatography—mas…
Optical absorption and thermoluminescence in LiF TLD-100
The thermoluminescent (TL) properties of many LiF samples have demonstrated a strong influence on trace impurities and impurity content on the TL process. Hence, the general validity of any particular model must be tested against its applicability in a standard material such as Harshaw LiF (TLD-100). In this paper the…
Electric Surface Strength and Surface Deterioration of Thermoplastic Insulators in Vacuum
Investigations have been made of various factors which effect the surface flashover strength across thermoplastic insulators in vacuum. The factors studied, for ac and dc excitation, included the dependence of flashover voltage on specimen length, metallization of the insulator ends, specimen conditioning under dc and…
A Raman spectroscopic study of the structural phase transition and reorientational motions of the ClO ions in KClO4
Abstract Polarized Raman spectra of oriented single crystals of KClO 4 performed over a large temperature range (300–800 K) have been used to investigate the mechanism of the 583 K phase transition. It is shown that the transition can be described using an order parameter and a mechanism based on the reorientation of…
Organo-transition metal clusters: rational approaches to synthesis, structure, fluxionality, and reactivity
By using the isolobality principle, it is shown that the electronic structures of the 4- through 9-atom organo-transition metal clusters are closely analogous to the corresponding boranes. This parallelism is extended beyond simple structural similarities and is used to account for the high reactivity and nmr fluxiona…
On the trifluoracetylation reaction of polyamides and polyurethanes
Abstract The kinetics and yields of N ‐trifluoracetylation of polyamides, polyesteramides, polyurethanes were studied by direct titration of trifluoracetic acid formed during the conversion. For polycaprolactam a limiting yield, corresponding to a complete substitution, was always achieved, independently of polymer mo…
Synthesis and molecular structure determination of carboxyl bound nicotinic acid (niacin) complexes of chromium(III)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and molecular structure determination of carboxyl bound nicotinic acid (niacin) complexes of chromium(III)James C. Chang, Larry E. Gerdom, Norman C. Baenziger, and Harold M. GoffCite this: Inorg. Chem. 1983, 22, 12, 1739–1744Publication Date (Print):June 1, 1983Pub…
Chemical synthesis of amino-group-containing (1 → 6)-α-D-glucan derivatives by ring-opening polymerization of 1,6-anhydroazido sugars
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical synthesis of amino-group-containing (1 → 6)-α-D-glucan derivatives by ring-opening polymerization of 1,6-anhydroazido sugarsToshiyuki Uryu, Kenichi Hatanaka, Kei Matsuzaki, and Hiroyoshi KuzuharaCite this: Macromolecules 1983, 16, 6, 853–858Publication Date (Print):…