Materials Literature
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種々の酸化セルロースの81.25%リン酸による均一加水分解速度を20,30および40℃ で測定し,加水分解速度に及ぼす変質基の影響を検討した。リンターセルロースを二酸化窒素で酸化して得たウロン酸基を含む酸化セルロースの加水分解速度はカルボキシル基量とは関係がなく一定で,木材セルロースとリンターセルロースの加水分解速度の相違はカルボキシル基量によるものではない。過ヨウ素酸塩で酸化したセルロースの加水分解速度は,アルデヒド基量の増加とともに増大し,これをさらに亜塩素酸塩で酸化したり,水素化ホウ素ナトリウムで還元したりすると,加水分解速度は低下するが,なお未処理試料のそれより大きい。以上の事実からウロン酸型のカルボキシル基はグルコシド結…
Abstract The crystal structure of isotactic poly(vinyl methyl ether) has been defined on the basis of x‐ray fiber spectra. Isotactic poly(vinyl methyl ether) crystallizes in a rhombohedral unit cell whose constants referred to hexagonal axes are: a = b = 16.25 ± 0.15 A., c = 6.50 ± 0.05 A. (chain axis) Z = 18, d calc…
The Jormation and the dissolution characteristics oj massive carbide in a bearing steel (I .O% C, 1. 5% Cr ) were studied with continuously cast blooms oj 260 171m' or oj 18U mm octagonal section. A conventionally cast ingot oj 350 171m' was also examined Jor comlJarison .
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Abstract N ‐Alkyl‐substituted polyamides and copolyamides have been prepared from N , N ′‐dialkyl p ‐xylenediamine and N , N ′‐dialkyl hexamethylenediamine with long‐chain aliphatic dicarboxylic acids. Crystalline N ‐alkyl polyamides were obtained by the use of dicarboxylic acids higher than C 16 . The melting point v…
The kinetics of dehydroxylation of crocidolite have been studied in vacuo. The kinetic data may be interpreted in terms of a diffusion-controlled reaction based on radial diffusion out of a cylinder. The activation energy for the process is 49 kcal/mole.
Abstract Thermal degradation processes are of great importance in the case of polyoxymethylene. Establishment of the mechanism of oxidative decomposition is particularly important, because it proceeds under conditions when depolymerization is predominant over oxidation. The basic kinetic regularities of thermal and th…
The urea-inclusion-compound-forming ability of a series of closely related ketones was measured to determine the applicability of this procedure for separating and isolating the ketones. The results indicate this can be done.
The rates of dissolution of carbon from the rotating or stationary graphite rods into liquid Fe-C alloy were studied in the temperature range 1270-1550°C.It was concluded that the dissolution process was controlled by mass-transfer in the liquid.Applying non-dimensional correlation of mass-transfer under the forced co…
Abstract Circulating hydrogen‐oxygen mixtures were reacted at atmospheric pressure in a single long porous catalyst cylinder which contained a thermocouple‐micromanometer probe. Rate and temperature rise data were obtained at 20°, 30°, 50°, and 60°C. in the concentration range 0 to 5% oxygen in hydrogen. The data were…
Abstract Es wurde festgestellt, daß die Wachstumsgeschwindigkeit der {100}‐Flächen von KBr‐Kristallen unter dem Einfluß von aliphatischen Carbonsäuren abnimmt, und zwar nach der von einem der Autoren früher abgeleiteten Abhängigkeit (Bliznakov 1954; 1958). Säuren, die eine größere Anzahl von CH 2 ‐Gruppen enthalten, w…
Abstract Research on the kinetics of crystallization of polycarbonates based on bisphenol A at 190°C. has been carried out on six polydisperse samples. It was found that the process of crystallization, after a long period of induction, follows a course which can be described by the classical equation of Avrami. The fi…
The small, but often significant, voltage ratio error of a ratio transformer is caused by leakage of magnetic flux and the flow of displacement currents around the windings. A model of the flux leakage pattern within a toroidal transformer is used in conjunction with an analysis of the effect of interwinding capacitan…
K. Watenpaugh and C. N. Caughlan, Chem. Commun. (London), 1967, 76 DOI: 10.1039/C19670000076
The syntheses of nitrogenous aluminosilicates of montmorillonite, mica, and zeolite groups first made in 1961 have been extended. Aluminosilicate and gallosilicate montmorillonites have been prepared above 200° in the presence of larger organic ions than previously, such as tetraethyl-, tetrapropyl-, and tetrabutyl-am…
Les propriétés de symétrie des opérateurs à trois particules à l'intérieur des configurations (d + s)N ont été étudiées dans les opérations des groupes de rotation R5 et R 6. La symétrie symplectique (Sp12) et l'espace de quasi-spin ont été également examinés. L'ensemble de ces résultats a permis de montrer que l'inte…
The review has been confined, in the main, to methods applicable to metallic coatings on metals, irrespective of the means employed to apply the coating, but where techniques used for organic, or more rarely ceramic, coatings appear to be applicable to metals on metals these have been included. The literature up to 19…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnthalpy, heat capacity, and heat of fusion of magnesium from 404.degree. to 1300.degree.KRichard Addison McDonaldCite this: J. Chem. Eng. Data 1967, 12, 1, 131–132Publication Date (Print):January 1, 1967Publication History Published online1 May 2002Published inissue 1 Janua…
Whole casein, αs-casein and k-casein were dephosphorylated with a phosphoprotein phosphatase prepared from beef spleen and their calcium-binding capacities were compared with those of respective native caseins by a ultracentrifugal method. The bindings of the calcium to 94% dephosphorylated whole casein and to 97 % de…
The inhomogeneous mechanism for the crystallographic transformation of brucite (Mg(OH)2) to MgO postulated by Ball and Taylor 1 is re-examined. This postulate was based upon the observation of X-ray reflections attributable to a spinel structure in decomposed brucite crystals. In the present work a relatively pure Mg(…