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Measurements have been made of the thermal conductivity of iron oxide layers in the `as-formed' condition for oxide thicknesses in the range 0·027-0·48 mm over the temperature range 50-80°C. A steady-state method, involving the use of a calibrated thermopile for determining the surface temperature of the oxide, has be…
If the crystallites making up a diffractometer specimen have a number-average size , and the distribution function of crystallite sizes has a variance Wp and skewness p, the crystallite size obtained from the slope of the variance-range curve will be and that obtained from the intercept will be Even when Wp and p are…
Abstract Thermal degradation of polyisocyanates was investigated. The only degradation products were monomer and trimer. The main product was trimer for most aliphatic polymers, and monomer for aromatic polymers. Poly(cyclohexyl isocyanate) gave only its monomer on account of steric requirements. The apparent activati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComparison of the donor properties of dimethylcyanamide and acetonitrileH. Fred Henneike Jr. and Russell S. DragoCite this: Inorg. Chem. 1968, 7, 9, 1908–1915Publication Date (Print):September 1, 1968Publication History Published online1 May 2002Published inissue 1 September…
Abstract Chlorination of a low molecular weight polystyrene in the α position was studied by following changes in the infrared spectrum, glass transition temperature, and molecular weights of the polymer. The logarithm of the absorbance ratio at 2920 and 1500 cm −1 as a function of mole per cent chlorination was linea…
Potentiostatic anodic polarisation studies have been carried out on two carbon steels and three stainless steels in oxidising media. The resulting curves clearly defined the conditions necessary for anodic protection. Apparatus was devised whereby corrosion fatigue tests could be conducted under conditions of impresse…
Abstract The relative reactivities of α‐monosubstituted cyclic ethers having rings of three to six members toward a cation were estimated from their copolymerizations with 3,3‐bis‐(chloromethyl)oxetane (M 1 ) catalyzed by boron trifluoride etherate in methylene chloride at 0°C. It was found that the reactivity of thes…
Results of our experimental investigation on the magnetization, specific heat, and neutron diffraction in Fe-Co alloys are reported and interpreted by a statistical theory in B-W approximation. The exchange interactions between neighboring atoms in bcc are determined so that the theory reproduces the experimental magn…
The procedure for interpreting broadened diffraction maxima in terms of particle size is illustrated by means of two samples of nickel powder. The average size of the particles in submicron nickel is determined from a comparison of various measures of breadth of broadened profiles with the breadths of `standard' lines…
Measurements of the frequency dependence of the dielectric conductivity, Hall mobility, and thermal EMF as a function of temperature on polycrystalline Ni0.6Fe0.4Fe2O4indicate that these data can be interpreted in terms of the band model. Previous analyses of the semiconductor properties of ferrites according to the h…
SUMMARY Sixtytwo bacterial cultures isolated from a range of deteriorated plastic materials were tested for their ability to degrade a particular PVC mix plasticized with di‐ iso ‐octyl sebacate. Twentythree of them, mainly members of the genera Pseudomonas and Brevibacterium , gave weight losses of up to 20% in 2 wee…
Hydrogen in rutile has two influences on the electrical properties: Verneuil crystals contain hydrogen compensating the trivalent impurities. Excess hydrogen acts as an electron donor, thereby increasing the conductivity. Removal of hydrogen above 650°C in vacuum causes structural changes accompanied by enhanced condu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular conformation of chymotrypsinogen and chymotrypsin by low-angle x-ray diffractionW. R. Krigbaum and R. W. GodwinCite this: Biochemistry 1968, 7, 9, 3126–3131Publication Date (Print):September 1, 1968Publication History Published online1 May 2002Published inissue 1 S…
Electronic structure of hexagonal ε -Fe 2 N and orthorhombic ζ-Fe 2 N were determined by the measurement of superstructure reflection intensities, which are contributed only by nitrogen atoms. Specimen films were produced by nitriding evaporated polycrystalline iron films with ammonia gas. From the analysis of observe…
We investigated some relationships between the hydrolysis rate with cellulase and the swelling degree of the cellulose fibers of different samples. The water retention value (WRV) determined by the centrifugal method was used as a measure of the swelling degree. A linear relationship was observed between the hydrolysi…
In the two modifications of TeO 2 and in the tellurites two limiting cases for the coordination of oxygen around tellurium are known: on the one hand a 3-coordination in the shape of a trigonal pyramid, and on the other hand a 4-coordination in the shape of a trigonal dipyramid with one of the corners of the equatoria…
Abstract A thermodynamic study was conducted of water vapor adsorption on four hydrophilic polymers (agar, carboxymethyl cellulose, gelatin, and maize starch) at 12 and 25°C. Monolayer coverage amounted, after correction for crystallinity, respectively, to 0.93, 1.46, 0.51, and 0.77 mol water/mol monomer. Evidence is…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetoxication mechanisms. III. Scope and mechanism of the iron-catalyzed dealkylation of tertiary amine oxidesJ. P. Ferris, Roderick D. Gerwe, and G. R. GapskiCite this: J. Org. Chem. 1968, 33, 9, 3493–3498Publication Date (Print):September 1, 1968Publication History Publishe…
In the extremely interesting Jubilee article 'Electrons in metals and alloys' by Prof. H. Jones in the June 1968 issue of Physics Bulletin, I was disappointed to see that the electron diffraction patterns of CuAu alloys were described as 'Laue photographs', and that both were stated to be projections of the reciprocal…
Systematic infrared studies of a series of polyhexamethylene adipamides (nylon 66) have resulted in the assignment of two bands to the regularly folded polymer chain. Utilizing this assignment and long-period measurements by small-angle X-ray diffraction, a method has been developed to compare the amount of regular ch…