Materials Literature
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Abstract The dilute‐solution behavior of poly(vinyl alcohol) (PVA VTFA ), derived from vinyl trifluoroacetate, in water‐dimethylsulfoxide (DMSO) mixtures was investigated. With solvent mixtures ranging from 10 to 20 vol % DMSO, the relation between the reduced viscosity η sp / C and the polymer concentration C was lin…
In a field experiment in which heavy applications of liquid dairy manure were added annually for 6 yr to a vermiculite-containing corn-cropped sandy clay loam soil (Mountain series), fixation potential and X-ray diffraction analyses were done to determine if fixation of added K + and NH 4 + had occurred and clay miner…
The effects of carbon black type and loading, and variation of base polymer, on a series of polychloroprene rubbers (neoprenes) have been investigated. Two common types of neoprenes, each with a lead oxide cure system, were used. The acoustic responses of these materials were characterized for extensional wave propaga…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(iminomethylenes). 21. Synthesis of copolymers of isocyanides derived from alanylserine and alanylhistidineH. G. J. Visser, R. J. M. Nolte, J. W. Zwikker, and W. DrenthCite this: J. Org. Chem. 1985, 50, 17, 3138–3143Publication Date (Print):August 1, 1985Publication Hist…
Various desalination methods had been used in the past to treat a large collection of archaeological iron objects. In order to establish whether desalination treatments had been effective, the condition of the objects was assessed and the data analyzed using statistical methods. It was found that objects which had bee…
Abstract With the current interest in the use of transition metal-exchanged phyllosilicates as catalysts for novel organic syntheses, investigations into the factors which affect the movement of reactant, product, and solvent molecules into and out of their interlamellar region are of considerable importance. Mixed or…
Temperature dependence of the Faraday effect is investigated for As2S3 fiber at 3.39 microm, obtaining a Verdet constant V of 1.62 x 10(-2) min/cm x G at room temperature and a temperature-dependence term coefficient of 10.67 min x K/cm x G in the experiments. The V value obtained at 25 degrees C is consistent with th…
The application of an energy minimization technique is described which computes the equilibrium shape and interyarn forces of the single bar warp knitted fabric structures. The boundary conditions required for the solution of the single bar warp knitted fabric structures are derived. The method by which these boundary…
Abstract Titled compounds were found to form charge-transfer (CT) complexes with aromatic hydrocarbons or tetrathiafulvalene (TTF) and the molecular complexes could be isolated.
A new ultramicrohardness tester for a load range between 2×10−2 and 5×10−5 N is described. The instrument is operated inside a scanning electron microscope. Load is applied and measured by means of electrical signals thus making fully automized experiments possible. Typical examples demonstrate the capability of the d…
Abstract Two crystal modifications have been found for poly(3,3‐bisethoxymethyl oxetane) [poly‐ (BEMO)] by wide‐angle x‐ray powder diffraction and differential scanning calorimetry, while only one modification has been found for poly(3,3‐bisazidomethyl oxetane) [poly(BAMO)]. Melting temperatures for the two polymers w…
Measurements of the mechanical threshold, or threshold stress, are reported on quasi-statically and dynamically deformed copper and Nitronic 40. Results for copper show that the increase of the threshold stress with strain rate is similar to that of the flow stress. In Nitronic 40 the results show that the ratio of th…
A new cardiac glycoside "vijaloside" in addition to well known cardenolide, asperosid (digitoxigenin-2',3'-di- O-methylglucopyranoside) have been isolated and identified from the roots of STREBLUS ASPER. Repeated chromatgraphic manipulations and spectral analysis (IR, (1)H-NMR, (13)C-NMR and Mass), suggested the struc…
Abstract Reactions between hydroxy-Al ions and orthosilicic acid as influenced by citric acid were studied at an initial Si concentration of 1.6 × 10 −3 M, Si/Al molar ratios of 0.5 and 1.0, OH/Al molar ratios of 1.0-3.0, and citric acid/Al molar ratios of 0-0.3. In the absence of citric acid and at OH/A1 ratios of 1.…
Temperature variation of the dielectric permittivity, refractive indices, birefringence, density and order parameter of nematic liquid crystalline mixtures 1333, RO-TN 605, 2855, E-43 and ZLI-1565 are reported. The dielectric studies are in the frequency range 1 KHz to 3.5 MHz. The dielectric permittivity component pa…
Filamentary thermal breakdown is discussed on the basis of experimental results on the electrical conduction just prior to breakdown in polyimide (PI) and polyethylene (PE) with a dc ramp voltage applied at 90°C. In PI, the pre-breakdown current was almost proportional to the electrode area S till about 100 µs before…
Ten taxa of marine diatoms from SE. or NE. Australia are described or redescribed, and their characters are supplemented by fine-structural and developmental data. One genus (Pseudoguinardia von Stosch), one species (Pseudoguinardia recta von Stosch), and two varieties (Odontella retiformis var. trigona von Stosch and…
The low‐temperature tetragonal‐monoclinic phase transformation in yttria‐doped tetragonal zirconia polycrystalline ceramics which results in strength degradation was found to be reversible. The retransformed ceramic has properties equivalent to those of the as‐sintered ceramic.
Abstract A model incorporating a rough (disordered) crystal growth surface is capable of treating many of the observations and measurements on the crystal growth of short chains of poly(ethylene oxide) from the melt. A simple preliminary treatment if presented which aims primarily to analyze the growth rate data withi…
Abstract MSn(OH) 6 (M = Mg, Co, Zn, Mn, Cd, Ca, Sr, and Ba) and their solid solutions were synthesized by coprecipitation from aqueous solutions of Na 2 Sn(OH) 6 complex and MCl 2 . MSnO 3 and their solid solutions were prepared by thermal decomposition of these MSn(OH) 6 precipitates. Coprecipitation procedures were…