Materials Literature
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Results are given for the thermal conductivity, thermal diffusivity and specific heat of pyrophyllite before and after heating to temperatures up to 1200° C. Before heating, the conductivity in directions parallel to the bedding planes is about 0.01 cal cm/cm 2 s °C (0.04 joule cm/cm 2 s °C) and at right angles to the…
Abstract The purpose of the investigation was to study the effects of fillers, especially various types of carbon black and new light-colored reinforcing fillers. In the discussion of the problem, it is shown that permeability to gases is related to the rate of diffusion, and to the solubility of the gas in rubber, an…
In general, extension of an elastomer results in a degree of preferred orientation of the molecular chains composing the amorphous phase. Therefore the amorphous fraction of a partially crystalline elastomer must be related to the integrated intensity of the amorphous diffraction halo rather than to the intensity at a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Adsorption and Heats of Adsorption of Water on Spheron 6 and GraphonB. Millard, E. G. Caswell, E. E. Leger, and D. R. MillsCite this: J. Phys. Chem. 1955, 59, 9, 976–978Publication Date (Print):September 1, 1955Publication History Published online1 May 2002Published inis…
The semitheoretical expression, fc=Δn0−csFΔnc0−cs,where fc=volume fraction crystalline, Δn0=observed birefringence, c=the stress-optical coefficient, s=the stress on actual cross section, F=a known function of crystallite orientation, and Δnc0=the birefringence of a single polymer crystal, is proposed for relating bir…
Abstract Pure dry caprolactam (CL) does not polymerize on heating at 250°, but does so readily in presence of small quantities of water to yield an equilibrium polymerizate consisting of a linear polymer fraction (including some monomeric ϵ‐aminocaproic acid), unconverted lactam and higher cyclic oligomers. This equil…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption of Elastomers on Carbon BlackGerard Kraus and Joseph DugoneCite this: Ind. Eng. Chem. 1955, 47, 9, 1809–1816Publication Date (Print):September 1, 1955Publication History Published online1 May 2002Published inissue 1 September 1955https://doi.org/10.1021/ie50549a03…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface Strain in Oxide Cata1ysts–A1uminaE. B. Cornelius, T. H. Milliken, G. A. Mills, and A. G. ObladCite this: J. Phys. Chem. 1955, 59, 9, 809–813Publication Date (Print):September 1, 1955Publication History Published online1 May 2002Published inissue 1 September 1955https…
The C17 branched-chain fatty acid 15-methylhexadecanoic acid has been isolated in trace quantities (approximately 006% of total fatty acids) from hydrogenated ox perinephric fat.
The well-known principle that the deflection of electrons in a uniform electric field can serve to measure the distribution of their energies, has been investigated both theoretically and experimentally. Simple theory suggests a particular choice of parameters for an instrument intended for such measurements. Design e…
Abstract Theoretical results on the abrasion of rubber have been deduced from a few simple assumptions concerning the initiation of the surface damage. The abrasion is proportional to the normal load, independent of the particle size of the abrasive if the particles are polyhedral, and proportional to their mean radiu…
(1955). XXVII. Thermoelectric Applications of Semiconductors. Journal of Electronics and Control: Vol. 1, No. 2, pp. 218-222.
Thermal insulation, thickness, and volume of air per unit area of fabric have been determined for single and multiple layers of fabrics. A comparison of the thermal in sulation and thickness values obtained by the actual measurement of multiple layers of fabrics to those obtained by adding the values of the individual…
Experimental techniques for measuring the magnetic susceptibility tensor components in microwave cavities are described. General expressions for the perturbation of microwave cavities by the magnetic properties of ferrites are developed. Experimental results are given for Ferramic 1331 measured at 9165 Mcps. Since the…
The decomposition of pure nitric oxide and of mixtures with nitrogen or helium was studied at T = 1170 to 1530°K in quartz vessels. Above about T = 1400°K, the reaction is homogeneous and cleanly second order in NO throughout the course of decomposition. A change in the surface to volume ratio leaves the rate unchange…
Abstract Little has been reported about the action of benzoyl peroxide as a vulcanizing agent for silicone rubber. Knowledge of this action seems to be of consider- able importance, since benzoyl peroxide is the most widely used vulcanizing agent at the present time. Apparently no studies of the kinetics of peroxide d…
ABSTRACT The water contact angles of insects show a wide range of variation, which is broadly correlated with surface roughness and with habitat. The contact angles of species inhabiting stored products or carrion are greatly modified by contamination. This produces large variations between apparently similar individu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpecific Heat of Synthetic High Polymers. VI. A Study of the Glass Transition in Polyvinyl ChlorideSaul Alford and Malcolm DoleCite this: J. Am. Chem. Soc. 1955, 77, 18, 4774–4777Publication Date (Print):September 1, 1955Publication History Published online1 May 2002Publishe…
Abstract A convenient and rapid x‐ray diffraction method is described for the determination of per cent crystallinity in polyethylene, using a scanning goniometer with Geiger tube and scaler counter. Results are presented on per cent crystallinities of a number of polyethylenes and on samples made by quenching polyeth…
This paper presents a geometrical model of a plain knitted loop as a basis for a mathematical description of the dimensional properties of a plain knitted fabric.