Materials Literature
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The thermal degradation of polytetrafluoroethylene oxide has been examined by the isothermal and thermogravimetric methods in the temperature range 450 to 650°C. The main components of the volatile gas are trifluoro-acetyl fluoride, carbonyl fluoride, and tetrafluoroethylene. The thermogravimetric decompositions of po…
The breakaway phenomena of Zr and some Zr alloys during high temperature oxidation were studied from a structural point of view, by means of high temperature X-ray diffraction, thermal gravimetry, optical microscopy, and differential thermal analysis. The structural change in oxide scale at breakaway is in close relat…
Abstract Potentiometric titrations have been carried out on a sample of poly(acrylic acid) of very high molecular weight ( M w = 1.92 × 10 6 ). At polymer concentrations greater than about 1 × 10 −4 equiv./liter, this material behaves as a weaker acid, under given conditions, than when it is heat degraded, and also co…
Abstract Using dilatometric techniques, detailed investigations have been made of the crystallization and melting behavior of high molecular weight poly(tetramethylene oxide), low molecular weight poly(tetramethylene oxide) glycol, and a high molecular weight copolymer prepared by the chain extension of the glycol. Th…
The Raman spectrum of the complex InCl3,2Et3O just above the melting point indicates that both ether molecules are co-ordinated to indium and that the InCl3 unit is planar. Characteristic frequencies due to internal vibrations of the ligands are similar to previously observed frequencies in the complex of aluminium ch…
C. A. Parker and T. A. Joyce, Chem. Commun. (London), 1967, 744 DOI: 10.1039/C19670000744
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