Theory of crystallization in copolymers
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On the relations between structure and morphology of crystals. I
An attempt is made by Hartman & Perdok to find relations between crystal structure and crystal morphology on an energy basis. It is concluded that the morphology of a crystal is governed by chains of strong bonds running through the structure.
Dielectric Materials and Applications
Abstract not Available.
Electrical and Optical Properties of Indium Selenide
The electrical and optical properties of InSe have been investigated with single crystals of the compound. The spectral dependence of the optical absorption coefficient and of the photoconductivity was measured. The optical absorption edge was not sufficiently well defined for the band gap to be estimated unambiguousl…
Viscosity and the structure of molten silicates
Abstract A mgnetically controlled null-point modification of the rotating crucible viscometer has been devised which enables measurements of the viscosity of liquids to be made at maximum temperatures of 1850° C. The instrument has been applied to measure the viscosity of the system CaO -SiO2 over the composition rang…
The crystal structure of polyethylene terephthalate
Abstract The crystal structure of polyethylene terephthalate (Terylene) has been determined by the interpretation of the X-ray diffraction patterns given by drawn fibres. The unit cell, which contains one chemical unit, —CO.C6H4.CO.O.(CH2)2O—, is triclinic, with a = 4.56Å, b = 5.94 Å, c = 10.75 Å, α = 98 1/2°, β = 118…
Vulcanization Structures and Their Influence on the Heat Resistance and Fatigue of Rubber
Abstract (1) The phenomenon of stress relaxation in vulcanizates, due to thermal decomposition of the vulcanization structures, is discussed. The process follows the equation: σ t =σ 0 ⋅e −kt , where k is the kinetic constant of decomposition of the vulcanization structures, and therefore can serve as a measure of the…
Practical Loom Experience on Weavability Limits
Any one making a design for a woven fabric naturally wants to be sure in advance that the loom will weave the design. Thus, a practical designer, when first considering the use of Love's weavability graphs, is likely to ask himself: "The geometry may be all right, but how about loom performance? How closely can I expe…
Effect of molecular weight distribution on gel formation by high energy radiation
Abstract The effect of exposing long chain polymers to high energy radiation is either to produce crosslinking or chain degradation. Changes in some of the properties are outlined. The formation of gel in many polymers offers a possibility of obtaining information as to the initial molecular weight distribution. Resul…
The Alkali Orthophosphates. Phase Equilibria in Aqueous Solution.
ADVERTISEMENT RETURN TO ISSUEArticleNEXTThe Alkali Orthophosphates. Phase Equilibria in Aqueous Solution.Bernard Wendrow and Kenneth A. KobeCite this: Chem. Rev. 1954, 54, 6, 891–924Publication Date (Print):December 1, 1954Publication History Published online1 May 2002Published inissue 1 December 1954https://pubs.acs.…
Determination of thermal conductivities at high temperatures
The usual electrical methods of determining thermal conductivities either cannot be used at high temperatures or their use is restricted to substances like carbon or graphite which satisfy certain special requirements. It is shown that the observed temperature distribution along a metal filament electrically heated in…
The Absorption of Water by Woodlice
ABSTRACT Experiments were undertaken to determine the site of water uptake, and the conditions in which it occurs, in Ligia oceanica, Oniscus asellus, Porcellio scaber and Armadillidium vulgare. Besides absorbing water with moist food, all four species were capable of active imbibition of water through both mouth and…
Anisotropy of Diffusion in Grain Boundaries
Grain boundary penetrations of radioactive silver into copper bicrystals having a common cubic direction have been measured using an autoradiographic technique. Diffusion occurred along directions forming an angle φ=0°, 45°, and 90° with the common cubic direction. For very low angles of disorientation Θ, no preferent…
Thermal degradation of polymers as a function of molecular structure
\Vhen heated in a vacuum at temperatures of about 200 0 to 500 0 C, p oly mer chains break p into volatile fragments of various sizes, dependin g on t l1 e natu re of l ll e polymer. Som e ,Joly mers, like pol y -alpha-meth ylstyrene, y ield the monomer exclusively. Other polymers, like polymethylene, yield a whole sp…
Yttrium Chromium Oxide, a New Compound of the Perowskite Type
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTYttrium Chromium Oxide, a New Compound of the Perowskite TypeJohn T. Looby and Lewis KatzCite this: J. Am. Chem. Soc. 1954, 76, 23, 6029–6030Publication Date (Print):December 1, 1954Publication History Published online1 May 2002Published inissue 1 December 1954https://pubs.a…
The Preparation of Lanthanum Titanium Oxide, LaTiO31
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Preparation of Lanthanum Titanium Oxide, LaTiO31Michael Kestigian and Roland WardCite this: J. Am. Chem. Soc. 1954, 76, 23, 6027Publication Date (Print):December 1, 1954Publication History Published online1 May 2002Published inissue 1 December 1954https://pubs.acs.org/do…
A natural inhibitor of pitting corrosion of copper in tap‐waters
Abstract Many supply waters that might be expected to cause pitting corrosion in copper cold‐water pipes containing carbon films do not do so because they contain a natural inhibitor. The inhibitor has not been identified, but it can be shown to be present in these waters and its concentration can be compared roughly…
Phase Equilibria in the System CaO–Ti02
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase Equilibria in the System CaO–Ti02R. C. DeVries, Rustum Roy, and E. F. OsbornCite this: J. Phys. Chem. 1954, 58, 12, 1069–1073Publication Date (Print):December 1, 1954Publication History Published online1 May 2002Published inissue 1 December 1954https://pubs.acs.org/doi…
Sintering and Grain Growth of Alumina
The sintering and grain growth of alumina as a function of the type of impurity (oxide) added was studied. One weight per cent of the impurity was added to a commercial Be‐grained alumina or was coprecipitated with iilcl 3 to form hydroxides. Fired shrinkage, bulk density, and apparent porosity measurements were used…
The crystal structure of WAl12, MoAl12and (Mn, Cr)Al12
The crystal structure of WAllg.has been determined from powder samples.The unit cell is bodycentred cubic and a ----7.580 A. There are two WAll~ units per cell.The space group is T~-Im3.Two W atoms are placed in special positions 0, 0, 0, ~,1 :t2, '~ and 24 A1 atoms are in positions 24(g) with y ----0.184and z = 0.309…