Materials Literature
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Abstract The melt flow behavior of straight emulsion‐polymerized PVC in a capillary extrusion rheometer has been found to depend upon both the molecular weight and the particle size of the sample. Observations of flow‐rate, post‐extrusion swell, and extrudate appearance, as functions of extrusion temperature and press…
Commercially pure titanium and the alloys studied exhibited active to passive transitions in . Increasing the acid concentration increased the critical current density for passivity and the dissolution current density in the passive range and shifted the critical potential for passivity in the noble direction. Increas…
Abstract Magnetic properties of Sr‐, Ba‐ and Sr‐Ba‐ferrite single crystals are reported. From torque measurements results: Sr‐ferrite: M s = (380 ± 20) G, K 1 = (3.5 ± 0.1) × 10 6 erg cm −3 ; Ba‐ferrite: M s = (380 ± 20) G, K 1 = (3.2 ± 0.1) × 10 6 erg cm −3 . A large difference was found by a comparison of H ci, theo…
The crystal structure of [Ni(OMe)(o-O·C6H4·CHO)(EtOH)]4 has been determined by three-dimensional single-crystal X-ray methods. Four molecules of point symmetry (S4) occupy a tetragonal unit cell with a= 22·17, c= 9·70 Å in space group I41/a. The four nickel atoms in the molecule occupy the corners of a nearly regular…
S ummary A study has been made of the effects of bicarbonate on the root growth of a number of calcicole and calcifuge grasses. Differential effects of bicarbonate concentrations likely to be encountered in a calcareous soil solution (0–10 m‐equiv./litre) were found between the species. In general the root growth of c…
The Raman spectrum of CuCl2,2H2O is assigned unambiguously from single-crystal and deuteriation studies. In the case of (CH3NH3)2CuCl4 the assignment of the main bands from single-crystal studies is again unambiguous, but for the species containing ‘tetrahedral’ ions (Cs2CuCl4 and Cs2ZnCl4) only tentative assignments…
Abstract The measured transport properties of non‐stoichiometric GeTe have been satisfactorily analysed on the basis of a two‐carrier model and the various band parameters have been evaluated. In particular the variation of the carrier density of the system with composition has been obtained and then compared to the t…
Abstract The wetting properties of wood polysaccharides were characterized by Zisman's empirical parameter, the critical surface tension of wetting, γ c . Cellulose was tested in the form of cellulose films regenerated from viscose and cellulose acetate. It was found that the source of cellulose (cotton, wood and hydr…
Abstract Data are presented on the solubility in and permeation through polyolefin films of a number of gases and liquids. The permeation rates are found to be dependent on the type of film, the concentration and the temperature. A classical diffusion model explains the permeation mechanism and other relations serve t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(2,6-diphenyl-1,4-phenylene oxide)Allan S. HayCite this: Macromolecules 1969, 2, 1, 107–108Publication Date (Print):January 1, 1969Publication History Published online1 May 2002Published inissue 1 January 1969https://pubs.acs.org/doi/10.1021/ma60007a022https://doi.org/10…
The susceptibility of both commercial and experimental ferritic stainless steels to intergranular corrosion was investigated. It was found that heating to 1700° F or higher and cooling rapidly sensitized a wide variety of ferritic steels to intergranular corrosion. The effects of Mo, Ni, Cb, and Ti additions to the st…
I. THE CHILING TEMPERATURE CONCEPT A. Thermodynamic Approach The Gibbs free energy of a system at temperature T is defined as were H is the enthalpy and S the entropy of the system. The free energy change for any polymerization will be, therefore, When the polymer has a lower free energy than the initial monomer, a po…
Abstract “Anhydrous manganic acetic” is a linear polymer with the empirical formula [Mn 3 O(OAc) 6 · AcOH · OAc] n . The three manganese atoms in the monomeric unit are mutually connected by three pairs of acetate bridges and form an equilateral triangle with an oxygen atom in its centre. Acetic acid molecules and ace…
preoccupation with histological detail. It is with the object of re-instating the approaches of botanists concerned with overall aspects of growth and our own studies have been undertaken.
The ordered alloy Ni2Cr has been investigated by means of electron diffraction, electron microscopy, calorimetry, resistometry and tensile tests. The formation of the Pt2Mo type superstructure is revealed by an electron diffraction study on the single crystalline specimens. The size of ordered domains is of the order…
The thermal conductivity of sintered semiconductor alloys is calculated using the Klemens-Callaway model assuming that the boundary scattering can be adequately described by a mean free path. It is shown that the relative increase in thermal resistance increases with the amount of alloy disorder scattering and should…
Abstract New measurements of magnetic properties of pure FeCr 2 S 4 and CoCr 2 S 4 have been carried out. The g ‐factors of cobalt, iron, and chromium in these compounds were evaluated. Exchange interactions were deduced from computation of the experimental paramagnetic and magnetization curves.
Abstract The oxidation of γ‐MnOOH (manganite) in oxygen and its disproportionation in HNO 3 lead topotactically to β‐MnO 2 . The oxidation of synthetic α‐MnOOH (groutite) in oxygen depends on its cristallite size; finely divided crystals oxidise rapidly to Mn 5 O 8 which usually is stable but yields β‐MnO 2 by further…
Growth of hillocks has been observed during annealing of sputtered Au films. The height of a hillock is proportional to the area it occupies in the film. This empirical relationship has been used in a model which postulates that hillock growth is associated with stress relief in the Au. The model is able to relate the…
Abstract The phase relations, crystal structures, and magnetic properties of intermetallic compounds occurring in the Er–Fe system have been investigated. A phase diagram is given. The lattice constants of the compounds ErFe 2 , ErFe 3 , Er 6 Fe 23 , and Er 2 Fe 17 have been determined. These compounds are ferrimagnet…