Materials Literature
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The effects of thermal-neutron irradiation on the parameters involved in the thermoelectric figures of merit of Bi 2 Te 3 and its thermoelectric alloys have been examined. It was found that integrated fluxes of up to 2 × 10 18 neutrons/cm 2 are not sufficiently high to affect the figures of merit of these materials by…
Abstract 2,4‐ O ‐Benzylidene‐1,6‐dithiol‐D‐glucitol is prepared by nucleophilic displacement of tosyloxy groups from 3,5‐di‐ O ‐acetyl‐2,4‐ O ‐benzylidene‐1,6‐di‐ O ‐tosyl‐D‐glucitol with thioacetate in N , N ‐dimethylformamide and deacetylation of the product. Oxidative polymerization with oxygen and selenium dioxide…
Abstract Graft copolymerization of natural rubber and MMA was carried out in the presence of Bz 2 O 2 or AIBN as thermal initiator and hydrogen peroxide or benzophenone as photosensitizer. From the overall copolymerization product, the rubber–PMMA graft copolymer fraction was isolated from unreacted rubber and free PM…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption of polymers at the solution-solid interface. III. Polyethers on nylonG. J. Howard and P. McConnellCite this: J. Phys. Chem. 1967, 71, 9, 2991–2995Publication Date (Print):August 1, 1967Publication History Published online1 May 2002Published inissue 1 August 1967ht…
Measurements using strain gauges of the magnetostriction constants of Yb3+ and Ce3+ ions in YIG are presented. The temperature dependence of the magnetostriction for Yb3+ in YIG is compared to theories by Callen and Callen based on crystal-field (single-ion) and anisotropic rare-earth-iron-exchange (two-ion) interacti…
Atactic polystyrene was hydrogenated under different conditions. At incomplete hydrogenation, a mixture of polystyrene and poly(vinyl cyclohexane) results. The glass temperatures were studied under different conditions by differential thermal analysis and found to be 100°C for polystyrene and 80°C for poly(vinyl cyclo…
The dynamic mechanical behavior of 60Co irradiated polytetrafluoroethylene (PTFE) has been investigated at audio frequencies over the approximate temperature range of 80 to 600†K for irradiation doses up to 200 Mrad. The data presented herein, together with data obtained during earlier studies of the effects of radiat…
The complete set of elastic constants’ has been determined for reactor Grade A graphite and also for a nearly isotropic graphite of similar density and crystallite size. The specimens used were irradiated in a hollow fuel element in the materials testing reactor BEPO under conditions of good temperature and neutron fl…
The specific heat and the thermoelectric power of γ-FeMn alloys were measured for three different compositions. The peak of the specific heat at the Néel temperature is broad for Fe 70 Mn 30 but it becomes sharp when the concentration of Fe decreases. This tendency is interpreted in terms of the temperature variation…
Abstract Introduction of primary covalent crosslinks into linear, segmented elastomers was followed by observing their modulus–temperature behavior. The behavior of the linear segmented polymers is explained by association of glassy segments into regions which act as filler and quasi‐crosslink. In several cases crossl…
A quantitative investigation was conducted on the effect of micromechanical stress concentrations on the strength of two‐phase brittle‐matrix ceramic systems. The materials consisted of a continuous brittle matrix containing dispersions with elastic properties different from those of the matrix. A soda borosilicate gl…
Abstract Heterosiloxanes of transition metals contain the characteristic grouping SiOX; in the compounds known so far, X may be Au, Zn, Cd, Hg, Ti, Zr, Hf, V, Nb, Ta, Cr, U, Re, Fe, Co, Ni, or Pt. Most of these compounds are obtained from silanols, metal silanolates, acyloxysilanes, disiloxanes, or alkoxysilanes, i.…
The preparations and amino acid compositions of highly purified tropocollagen and insoluble polymerized collagen are described. These collagens appear to be very suitable for comparative studies in an investigation of the cross-linkages that are introduced into tropocollagen during the formation of polymerized collage…
The morphology of glassy amorphous PETP is characterized by ball-like structures in which a paracrystalline-type order is present. Movement of the balls is seen at annealing temperatures 5†C or more below Tg as well as at higher temperatures. Crystallization from the glass occurs by the formation of spherulites simila…
The photoconductivity decay in imperfect crystals can be described in terms of an exponential trap distribution, Nt(E) = N0 exp(− E/kT*), where N0 and T* are two parameters characteristic of the distribution. Theoretical expressions for the decay as a function of excitation intensity and temperature can be derived in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuantitative product study and a critical evaluation of the thermal decomposition of benzoyl peroxide in benzeneDeLos F. DeTar, R. A. J. Long, Jacob. Rendleman, John. Bradley, and Patrick. DuncanCite this: J. Am. Chem. Soc. 1967, 89, 16, 4051–4057Publication Date (Print):Aug…
The isothermal transformation rates for quartz to tridymite were studied in the presence of binary silicate liquids between the eutectic temperature and 1470°C. Oxide pairs included Na 2 O‐SiO 2 , PbO‐SiO 2 , FeO‐SiO 2 , and Cu 2 O‐SiO 2 . Micrographic and X‐ray analytical procedures were used. Transformation was most…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetic studies of permanganate oxidation reactions. II. Reaction with ferrocyanide ionMohamed A. Rawoof and John R. SutterCite this: J. Phys. Chem. 1967, 71, 9, 2767–2771Publication Date (Print):August 1, 1967Publication History Published online1 May 2002Published inissue 1…
Abstract The viscoelastic properties of amylose films plasticized with dimethyl sulfoxide were studied. The modulus–temperature curves of dimethyl sulfoxide‐plasticized amylose are typical for semicrystalline polymers at the higher concentrations of amylose and pass to those of amorphous polymers with the decrease of…
Thin films of nickel ferrite (NiFe2O4) have been prepared by a reactive-sputtering technique using an iron-nickel alloy as the cathode and oxygen-argon mixtures as the reactive gas. Electron microscopy and electron-diffraction studies indicate that films deposited on substrates at temperatures below 0°C are noncrystal…