Materials Literature
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The kinetics of polaron recombination into bipolarons in polypyrrole has been studied by optical-absorption spectroscopy on films doped in situ in an electrochemical cell. ESR studies confirm that the metastable states possess spin, while the stable states do not. The data reveal a slow evolution, consistent with pola…
A class of models for relaxation in strongly interacting glassy materials is suggested. Degrees of freedom are divided into a sequence of levels such that those in level $n+1$ are locked except when some of those in level $n$ find the right combination to release them, this representing the hierarchy of constraints in…
Reflection spectra were measured with oblique incident σ and π polarized light in a chiral smectic C liquid crystal. For the first-order diffraction, with σ -polarized incident light, the reflectionl light is π -polarized and vice versa.
The structures of three [OOl] coincidence twist grain boundaries were calculated for NiO. The symmetry of the structures enables the probable low‐energy configurations for a series of such boundaries to be deduced. The interfaces have a reduced density of ions in the boundary plane and achieve a maximum amount of undi…
The reactivities of calcined magnesites for industrial use and of magnesium oxides prepared from basic magnesium carbonate were assessed by using potentiometry to monitor pH changes in aqueous suspensions following step wise acid additions. The results were compared with those obtained by calorimetric measurements per…
The stress-strain properties of a NSSC-fluting medium plasticized with various amounts of ethylene glycol have been measured over a temperature range up to 250°C. By comparison with delignified and hemicellulose-extracted samples it is concluded that the major softening is to a large extent caused by the lignin. It is…
Abstract Chemical shift and scalar coupling constant data have been obtained for the 1 H, 13 C and 29 Si nuclei in allyl, methally, cis ‐ and trans ‐crotyl, cis ‐2‐methyl‐2‐butenyl and 3‐methyl‐2‐butenyl derivatives of trimethylsilane.
Four permanent magnet specimens of the form Sm1-xErx(Co,Fe,Cu,Zr)7.22have been investigated with regard to coercivity, remanence, energy product, and temperature coefficients of remanence and energy product at temperatures ranging from 200K to 800K. The results are compared with previously measured SmCo5and SmCo17type…
The deposition of the hexagonal ferrite films hopeful for high density recording has been attempted by means of Targets-Facing Type(TFT) of sputtering apparatus. The sputtering conditions and the concentration of sputtered films were investigated. The difference in composition between targets and deposited film become…
The nucleophilic substitution reactions between dimethylgalliumchloride (1) and the silyl sulfides (CH 3 ) 3 SiSR (R = CH 3 , C 2 H 5 , n-C 3 H 7, i-C 3 H 7 , Ph and CH 2 Ph) (2-7) in benzene result in the formation of the moisture-sensitive dimethyl(alkylthio)- and dimethyl(phenylthio)gallanes (CH 3 ) 2 GaSR (R = CH…
The time dependence of the rates of permeation of hydrogen through annealed and as-rolled nickel foils was measured in the temperature ranges 120–430°C and 80–200°C, respectively. Annealed specimens exhibited permeabilities, diffusivities and solubilities that were in fairly good agreement with previous results, while…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpecific formation of a polymer containing five-membered oxalactone rings in the main chain in the cationic ring-opening polymerization of 6,8-dioxabicyclo[3.2.1]octan-7-oneMasahiko Okada, Hiroshi Sumitomo, and Miharu AtsumiCite this: Macromolecules 1984, 17, 9, 1840–1843Pub…
Abstract By interfacial polycondensation of 4,4′‐dimercaptobenzophenone with oxalyl, succinyl, adipolyl, suberoyl, and sebacoyl chlorides new polythioesters were obtained. To determine the optimal conditions of interfacial polycondensation the influence of the following factors on yield and value of reduced viscosity…
Abstract Using thermodynamic Green's function technique, it is shown that the inclusion of anharmonic terms along with the mass and force constant change terms arising due to isotopic impurities in the crystal Hamiltonian, leads to a cross term Γ AD of defect with anharmonic parameters in the expression for the phonon…
Parallel biochemical and crystallographic studies have been carried out on the protein concanavalin B from Jack Bean (Canavalis ensiformis). The studies show the protein to be a monomer of 33,000 daltons with unexceptional amino acid composition and no covalently bound carbohydrate. The molecule contains a single, fir…
Today's challenges in the design of power transformers necessitate, among other things, very accurate calculation of the performance parameters of the transformer (such as losses, impedance, shielding, s.c. forces, etc.), reduction of load losses, and preventing overheating and local hot spots. Presented in this paper…
Stress and heat induced demagnetization of Co-Cr films with perpendicular magnetic anisotropy deposited on 50 μm thick polyimide base films has been studied. The loss in remanent magnetization Mrwas detected with a vibrating sample magnetometer VSM after the film had been stressed or heated. Mrdecreases monotonically…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRheooptical investigation of the transition behavior of polyphosphazenesT. P. Russell, D. P. Anderson, R. S. Stein, C. R. Desper, J. J. Beres, and N. S. SchneiderCite this: Macromolecules 1984, 17, 9, 1795–1799Publication Date (Print):September 1, 1984Publication History Pub…
Abstract Diarylnitroxyl radicals and their reduction products, the diaryl hydroxylamines are effective anti-fatigue agents for rubber, confirming the previously proposed mechanism of action of the diaryamincs. The nitroxyls are reduced by sulfur species formed during the vulcanization reaction to a mixture of hydroxyl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMaterial characterization of structural adhesives in the lap shear mode. 1. The effects of rateErol Sancaktar, Steven C. Schenck, and Shrikant PadgilwarCite this: Ind. Eng. Chem. Prod. Res. Dev. 1984, 23, 3, 426–434Publication Date (Print):September 1, 1984Publication Histor…