Morphology of amorphous polymers and effects of thermal and mechanical treatments on the morphology
Abstract
Materials Literature
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Catalysis on Supported Metals
It is often commented that the practice of catalysis has preceded its understanding. The comment is nowhere more valid than in the area of catalytic action on transition metal surfaces which is the primary basis of the present review. We shall attempt here to survey some developments which have brought about a renewal…
Dislocation Creep in Magnesium
A comparison of the creep behaviour of sintered magnesium powder and magnesium prepared by conventional methods has been made. Sintered material has a higher strength and quite different creep characteristics, which have been attributed to the presence of a magnesium oxide particle dispersion. Re-examination of all th…
Binding of Bilirubin to Low-Affinity Sites of Human Serum Albumin in Vitro Followed by Co-Crystallization
Human serum albumin has three hydrophobic binding sites for bilirubin, one high affinity and two subordinate sites. At pH 7.4 the two molecules of bilirubin bound at the latter sites are unstable, since the equilibrium concentration of free bilirubin is higher than the solubility. Co-crystallization takes place, resul…
Radical formation and fracture of highly drawn crystalline polymers
In tensile strength experiments of highly drawn crystalline polymers by using electron spin resonance the appearance of radicals is observed all over the strained sample long before its fracture. It is generally considered that the radical formation is the consequence of rupture of the most strained tie molecules. The…
Effect of Tin Ion Complexing Substances on the Relative Potentials of Tin, Steel and Tin-Iron Alloy in Pure Acid and Food Media
The relative potentials of tin, steel, and tin-iron alloy play an important role in controlling the corrosion of tinplate containers used for foods. Stannous ion, pH, and adsorbedfilms influence these potentials. Stannous ion concentration is determined by the complexing strength of certain anions common to foods. The…
DSC THERMOGRAMS OF SILK FIBROIN
The following results were obtained from investigation of DSC thermograms of silk fibroin.1. The decomposition temperature of the crystalline region of silk fibroin is estimated to be about 348°C from the DSC thermograms of the hydrolysis residue.2. Silk fibroin is changed thermally into unoriented β-type by the treat…
Effect of Dislocations on the Thermal Conductivity of LiF
Phonon scattering by dislocations was studied by measuring the thermal conductivity of deformed LiF crystals from 1.5 to 300 K. The conductivity is not proportional to T 2 , as observed by Sproull et al. , but is approximately proportional to T 3.5 or to T 3 depending on the deformation mode. After annealing at 300°C…
Hydrodynamically induced crystallization of polymers from solution. V. Tensile properties of fibrillar polyethylene crystals
Abstract A study has been made on the tensile properties of mats of fibrillar polyethylene crystals grown at various temperatures from stirred xylene solutions in a Couette‐type instrument. The stress‐strain behavior of fibrillar crystals precipitated above 100°C was found to be essentially Hookean, and the maximum va…
Thermal oscillations and their effect on solidification processes
The experimental observations of temperature oscillations in liquids and gases undergoing free convection are reviewed. The theoretical methods used to study problems of this type are indicated, and the extent to which current theory can account for the observations is discussed. Evidence for the occurrence of convect…
Precision differential calorimetry and the heat of fusion of polyethylene
Abstract A procedure is described for the analysis by computer of the output from a differential scanning calorimeter. Enthalpy calibration with a variety of materials confirms that alumina is excellent for this purpose. Both the crystallinity, x T , and the heat of fusion of polyethylene, ΔH T , vary with temperature…
Contribution to the “Filming Amine” Theory: An Interpretation of Experimental Results
Corrosion inhibitors find application in a great variety of industrial processes, such as pickling operations, petroleum processing, the chemical industry in general and many more. One prominent class of inhibitors is organic amines, predominantly used in acid environments. Their action has been exhaustively investiga…
Conductivity of Beta-Alumina and Its Dependence on Sodium and Magnesium Content
The relationship between conductivity and sodium content has been investigated for sintered beta‐alumina containing MgO . Conductivities of 3.5 × 10 − 3 , 8.0 × 10 − 3 , and 4.4 × 10 − 3 ohm − 1 ‐ cm − 1 were found for material containing 1, 2, and 4% MgO , respectively, with optimum sodium content. Experimental condu…
Development of texture and structure in Zr-2.5 wt% Nb extruded tubes
Factors which affect the texture and microstructure of Zr-2.5 wt % Nb extruded tubes have been investigated. The major factor that determines th~ texture is the way the metal flows, which is controlled by the die shape, the extrusion ratio and the lubricant. The microstructure is controlled by the temperature during e…
FORMATION OP TITANIC OXIDES OF ANATASE, BROOKETE AND RUTILE TYPES BY AERIAL OXIDATION OF TITANOUS SOLUTIONS
Abstract Aerial oxidation of titanous solutions has been carried out at temperatures between 60° and 95°C. A desired one of titanic oxides of anatase, brookite and rutile types, can be obtained from strongly acidic solutions by selection of the kind and concentration of anions present and temperature.
Silicon Epitaxial Growth by Rotating Disk Method
By a rotating disk method which had quantitatively been treated in fluid motion, silicon epitaxial deposition using the SiCl 4 ‐ H 2 system was effected at various susceptor rotation speeds and various pressures. Calculation of the growth rate was initially made with a one‐dimensional model of an infinite diameter dis…
Some physical properties of polyorganosiloxanes. I. Linear polyorganosiloxanes
Abstract Some physical properties of linear polydimethylsiloxanes have been studied. The states and transitions in polydimethylsiloxanes have been investigated by using the method of dynamic heat capacity and a thermomechanic method in the temperature range from −150 to +200°C. The temperature dependence of primary an…
The Effect of Surface Preparation on the Oxidation of Nickel
A study was made of the effect of surface preparation and pretreatment on the oxidation of zone‐refined nickel from 500° to 700°C. “Clean,” hydrogen‐reduced surfaces, maintained essentially free of impurities such as S, Si, Fe, and C, oxidized at a faster rate than air‐exposed electropolished or etched annealed nickel…
Hydrogen Ion (Proton) Conduction in Thoria-Base Solid Electrolytes
The total conductivities of a series of ThO 2 ‐ base electrolytes have been determined over a wide range of oxygen activity in atmospheres of H 2 / H 2 O / Ar mixtures. At 1200° and 1400°C and low oxygen activities, a significant conductivity contribution corresponding to hydrogen ion (proton) conduction was found for…
Nichtstationäre Keimbildung: Theorie und Experiment
Abstract Vorliegende Arbeit gibt einen zusammenfassenden Bericht zur Kinetik der Keimbildung, wobei besonders der nichtstationäre Verlauf dieses Prozesses untersucht wird. Auf Grund einer eingehenden Diskussion des Keimbildungsmechanismus wird. der Einfluß aktiver Unterlagen, wie auch die Art der Ausgangs‐ und der sic…